CN114196905B - Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace - Google Patents
Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace Download PDFInfo
- Publication number
- CN114196905B CN114196905B CN202111358908.6A CN202111358908A CN114196905B CN 114196905 B CN114196905 B CN 114196905B CN 202111358908 A CN202111358908 A CN 202111358908A CN 114196905 B CN114196905 B CN 114196905B
- Authority
- CN
- China
- Prior art keywords
- nitriding
- cylinder body
- furnace
- actuator cylinder
- inner hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005121 nitriding Methods 0.000 title claims abstract description 232
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 45
- 238000003672 processing method Methods 0.000 title claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000000137 annealing Methods 0.000 claims abstract description 31
- 238000003754 machining Methods 0.000 claims abstract description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 25
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000005070 sampling Methods 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 14
- 238000005520 cutting process Methods 0.000 claims description 12
- 238000013461 design Methods 0.000 claims description 10
- 230000003746 surface roughness Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 12
- 238000004321 preservation Methods 0.000 description 3
- 241001085205 Prenanthella exigua Species 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention provides a nitriding processing method of a TC6 titanium alloy actuator cylinder for aerospace, which ensures that the depth, the surface hardness and the mechanical property of a basal body of a nitriding layer are controlled to meet the technical requirements by adjusting the technological parameters in the nitriding process, and the deformation of an inner hole is effectively controlled by machining, honing, secondary nitriding and other processes. After primary nitriding treatment, the surface hardness of the TC6 titanium alloy actuator cylinder for aerospace can reach more than 800HV, the hardness of the position 0.02mm away from the surface can reach more than 500HV, the deformation of an inner hole can be controlled within 0.08mm, the mechanical strength of a matrix meets the requirements of national army standard GJB2218A and national standard GB/T2965, after stress relief annealing, honing and secondary nitriding treatment, the surface hardness can reach 800HV, the hardness gradient, metallographic morphology and matrix strength are basically consistent with the primary nitriding result, the inner hole size, cylindricity and roughness of the actuator cylinder body can be effectively controlled, and the inner hole does not need to be machined again, so that the inner hole hardness is ensured.
Description
Technical Field
The invention relates to the field of aerospace manufacturing, in particular to a nitriding processing method of a TC6 titanium alloy actuator cylinder for aerospace.
Background
The titanium alloy has two remarkable advantages of high specific strength and good corrosion resistance, has excellent properties of high specific strength, high fatigue performance, high corrosion resistance, low expansion coefficient, high stability and the like, and has good application prospect in the field of aerospace. However, the titanium alloy component is easy to adhere and mesh in the assembly process due to low surface strength and low heat conductivity of the titanium alloy, so that the titanium alloy component has poor wear resistance, and parts are easy to fail and even break. In order to improve the wear resistance of the titanium alloy, the surface strength can be increased by carrying out surface modification treatment through a nitriding process, so that the service life of the part is prolonged.
At present, the nitriding process of the titanium alloy is rarely used in China, and most of the nitriding processes are simple parts manufactured by TC4 titanium alloy, and few reports are made on the nitriding process of the TC6 titanium alloy. The TC6 titanium alloy actuator cylinder for aviation has very high requirements on the surface strength, the wear resistance and the dimensional accuracy of parts, and particularly has more severe control requirements on the deformation of an inner hole.
After nitriding of the titanium alloy, a nitride layer and a solid solution layer can be formed on the surface, the nitriding temperature is an influencing factor of the maximum thickness of the nitride layer, and the nitriding depth can be improved by prolonging the nitriding time. Although the wear resistance of the alloy can be greatly improved after nitriding treatment, the microstructure and mechanical properties of a matrix can be influenced by the excessively high nitriding temperature, meanwhile, the deformation of a part can reach 0.15-0.20 mm, and the effective hardening layer depth is too shallow due to the excessively low temperature, so that the wear resistance of the part is difficult to effectively improve. Therefore, the requirements of the depth of the nitriding layer, the surface hardness, the mechanical property of the matrix and the deformation control of the inner hole of the part are simultaneously met, and the method is a difficulty in the control of the nitriding process of the TC6 titanium alloy actuator cylinder.
Disclosure of Invention
In view of the above, the invention provides a nitriding process for a TC6 titanium alloy actuator cylinder, the depth, the surface hardness and the mechanical properties of a basal body of a nitriding layer can meet the technical requirements by adjusting the process parameters in the nitriding process, and the deformation of an inner hole is effectively controlled by machining, honing, secondary nitriding and other processes.
In one aspect of the present invention, there is provided a nitriding method of a TC6 titanium alloy actuator for aerospace, the TC6 titanium alloy actuator including an actuator body, a stationary shaft, and a cover plate, the nitriding method comprising the steps of:
s10, roughly machining an actuator cylinder body, a fixed shaft and a cover plate, reserving 20mm on one side of the end part of the actuator cylinder body, and reserving 2mm on one side of an inner hole;
s20, processing a nitriding tool according to the end shape of the actuator cylinder body completed in the step S10;
s30, wiping the actuating cylinder body, the fixed shaft, the cover plate and the nitriding tool, and drying by adopting oil-free compressed air or nitrogen;
s40, carrying out vacuum stress relief annealing treatment on the TC6 titanium alloy actuating cylinder and the nitriding tool after rough machining;
s50, semi-finishing an inner hole of the actuator cylinder body to be smaller than the designed diameter of 0.05-0.10 mm;
s60, finely machining an inner hole of the actuator cylinder body, honing the inner hole of the actuator cylinder body to be smaller than the designed diameter of 0.04-0.02 mm, and enabling the roughness Ra0.4;
s70, performing primary nitriding treatment on the TC6 titanium alloy actuator cylinder;
s80, performing unilateral linear cutting sampling detection on the end face of the actuator cylinder body;
s90, honing an inner hole of the actuator cylinder body to a design size;
s100, carrying out secondary nitriding treatment on the TC6 titanium alloy actuator cylinder;
s110, performing unilateral linear cutting sampling detection on the end face of the actuator cylinder body;
s120, machining the appearance of the actuator cylinder body to a margin of 0.1 mm;
s130, carrying out vacuum stress relief annealing treatment on the TC6 titanium alloy actuator cylinder and the nitriding tool which are processed in the step S120;
s140, machining the appearance of the actuator cylinder body to a design size;
s150, performing fluorescent flaw detection on the actuator cylinder body; and
s160, detecting the inner hole size, the inner hole surface roughness and the external dimension of the actuator cylinder body.
Preferably, in step S10, the actuator body includes a cylindrical single-hole cylinder structure, a rectangular double-hole cylinder structure, and a rectangular single-hole cylinder structure.
Preferably, in step S20, the material used for the nitriding tool is the same as the material of the cylinder body.
Preferably, in the step S30, absolute ethyl alcohol is used to wipe the outer wall and inner hole wall of the cylinder body, the outer wall of the fixed shaft, the outer wall and inner hole of the cover plate, and the outer wall of the nitriding tool.
Preferably, in the step S40, the step of vacuum annealing treatment includes:
s41, placing the actuator cylinder body, the fixed shaft, the cover plate and the nitriding tool into a vacuum annealing furnace;
s42, vacuumizing the vacuum annealing furnace, wherein the vacuum degree of the vacuumized vacuum annealing furnace is not more than 5Pa;
s43, heating the vacuum annealing furnace at a heating rate of 5-10 ℃/min until the temperature reaches 800-860 ℃, stopping heating, and preserving the heat for 2-3 hours; and
s44, naturally cooling the vacuum furnace, and discharging the actuator cylinder body, the fixed shaft, the cover plate and the nitriding tool when the temperature of the vacuum furnace is reduced to 150 ℃.
Preferably, in the step S70, the step of performing the primary nitriding treatment on the cylinder body, the fixed shaft, and the cover plate includes:
s71, loading the actuating cylinder body, the fixed shaft, the cover plate and the nitriding tools into a nitriding furnace, respectively and fixedly mounting the nitriding tools at two ends of the actuating cylinder body, then loading nitriding furnace trays, and ensuring that the distance between adjacent closest points of any two nitriding parts of the actuating cylinder body, the fixed shaft and the cover plate is not less than 100mm;
s72, filling ammonia gas into the nitriding furnace, exhausting air, and reducing the filling or exhausting speed of the ammonia gas after the furnace chamber of the nitriding furnace is filled with the ammonia gas, so that the concentration of the ammonia gas in the furnace chamber is kept constant in the nitriding process;
s73, heating the nitriding furnace at a heating rate of 5-10 ℃/min, and nitriding the nitriding furnace in three sections, wherein the first section is used for keeping the nitriding furnace at 400+/-10 ℃ and preserving heat for 5-6 hours, the second section is used for keeping the nitriding furnace at 650+/-10 ℃ and preserving heat for 7-8 hours, and the third section is used for keeping the nitriding furnace at 860+/-10 ℃ and preserving heat for 27-28 hours;
and S74, stopping filling ammonia gas when the temperature of the nitriding furnace is reduced to be less than 50 ℃, and taking out the actuator cylinder body, the nitriding tool, the fixed shaft and the cover plate to finish nitriding.
Preferably, in the step S80, the sampling detection of the actuator body includes the steps of:
s81, detecting the size of an inner hole of the actuating cylinder body, wherein the diameter variation of the inner hole before and after nitriding is not more than 0.08mm;
s82, cutting and sampling by adopting a wire electric discharge machine at one side of the end part of the actuator cylinder body, wherein the sampling thickness is not more than 10mm;
s83, detecting a metallographic structure of a nitriding layer of the sample piece, wherein the thickness of the nitriding layer is not less than 100 mu m;
s84, detecting the metallographic morphology of the core of the sample, wherein the metallographic phase of the base material of the core base Jin Xiangyu before nitriding is not obviously changed after nitriding, and the base material is composed of an equiaxial alpha phase and a needle beta phase;
s85, detecting the hardness gradient of the surface of the sample and the hardness gradient of the nitriding layer, wherein the hardness of the surface after nitriding is not less than 800HV, and the hardness of the nitriding layer which is 0.02mm deep from the surface is not less than 500HV;
s86, detecting the mechanical property of the sample, including prescribing non-proportional extension strength Rp 0.2 More than or equal to 880MPa, tensile strength Rm is 980-1180MPa, elongation after fracture A is more than or equal to 10%, area shrinkage Z is more than or equal to 25%, and impact toughness aK is more than or equal to 30J/m < 2 >.
Preferably, in the step S90, the hardness of the surface of the inner hole of the ram body after honing is not less than 500HV.
Preferably, in the step S100, the step of performing the secondary nitriding treatment on the cylinder body, the fixed shaft, and the cover plate includes:
s101, loading an actuating cylinder body, a fixed shaft, a cover plate and nitriding tools into a nitriding furnace, respectively and fixedly mounting the nitriding tools at two ends of the actuating cylinder body to prevent the orifice positions at the two ends of the actuating cylinder body from generating larger deformation in the nitriding process, then putting into a nitriding furnace tray, and ensuring that the distance between adjacent closest points of any two nitriding parts in the actuating cylinder body, the fixed shaft and the cover plate is not less than 100mm so as to avoid the mutual influence of the nitriding parts in the nitriding process;
s102, filling ammonia gas into a nitriding furnace, exhausting air, and reducing the filling or exhausting speed of the ammonia gas after the furnace chamber of the nitriding furnace is filled with the ammonia gas, so that the concentration of the ammonia gas in the furnace chamber is kept constant in the nitriding process;
s103, heating the nitriding furnace at a heating rate of 5-10 ℃/min, and nitriding the nitriding furnace in three sections, wherein the first section is used for keeping the nitriding furnace at 400+/-10 ℃ and preserving heat for 5-6 hours, the second section is used for keeping the nitriding furnace at 650+/-10 ℃ and preserving heat for 7-8 hours, and the third section is used for keeping the nitriding furnace at 820+/-10 ℃ and preserving heat for 20-21 hours;
s104, stopping filling ammonia gas when the temperature of the nitriding furnace is reduced to be less than 50 ℃, and taking out the actuator cylinder body, the nitriding tool, the fixed shaft and the cover plate to finish nitriding.
Preferably, in the step S110, the step of sampling and detecting the actuator body includes:
s111, detecting that the size of the inner hole of the actuator cylinder body meets the design requirement;
s112, cutting and sampling by adopting a wire electric discharge machine at one side of the end part of the actuator cylinder body, wherein the sampling thickness is not more than 10mm;
s113, detecting a metallographic structure of a nitriding layer of the sample piece, wherein the thickness of the nitriding layer is not less than 100 mu m;
s114, detecting the metallographic morphology of the core of the sample, wherein the metallographic phase of the base material of the core base Jin Xiangyu before nitriding is not obviously changed after nitriding, and the base material is composed of an equiaxial alpha phase and a needle beta phase;
s115, detecting the hardness gradient of the surface of the sample and the hardness gradient of the nitriding layer, wherein the hardness of the surface after nitriding is not less than 800HV, and the hardness of the nitriding layer which is 0.02mm deep from the surface is not less than 500HV;
s116, detecting the mechanical property of the sample, including prescribing non-proportional extension strength Rp 0.2 More than or equal to 880MPa, tensile strength Rm is 980-1180MPa, elongation after fracture A is more than or equal to 10%, area shrinkage Z is more than or equal to 25%, and impact toughness aK is more than or equal to 30J/m < 2 >.
Preferably, in the step S130, the step of vacuum annealing the TC6 titanium alloy cylinder after the secondary nitriding and the nitriding tool includes:
s131, placing the actuator cylinder body, the fixed shaft, the cover plate and the nitriding tool into a vacuum annealing furnace;
s132, vacuumizing the vacuum annealing furnace, wherein the vacuum degree of the vacuumized vacuum annealing furnace is not more than 5Pa;
s133, heating the vacuum annealing furnace at a heating rate of 5-10 ℃/min until the vacuum annealing furnace is heated to 800-860 ℃, stopping heating, and preserving heat for 2-3 hours; and
s134, naturally cooling the vacuum furnace, and discharging the actuator cylinder body, the fixed shaft, the cover plate and the nitriding tool when the temperature of the vacuum furnace is reduced to 150 ℃.
Preferably, in the step S150, the fluorescence flaw detection result is judged to meet the design requirement, and in the step S160, the inner hole size, the inner hole surface roughness, the outer dimension and the outer surface roughness of the actuator cylinder body are judged to meet the design requirement.
Therefore, compared with the prior art, the method can effectively control the deformation of the TC6 titanium alloy actuator cylinder for aviation by optimizing the nitriding temperature and nitriding time, honing and secondary nitriding, so that the depth of a nitriding layer, the surface hardness and the mechanical property of a matrix can meet the requirements; after primary nitriding treatment, the surface hardness of the TC6 titanium alloy actuator cylinder for aerospace can reach more than 800HV, the hardness of the position 0.02mm away from the surface can reach more than 500HV, the deformation of an inner hole can be controlled within 0.08mm, the mechanical strength of a matrix meets the requirements of national army standard GJB2218A and national standard GB/T2965, after stress relief annealing, honing and secondary nitriding treatment, the surface hardness can reach 800HV, the hardness gradient, metallographic morphology and matrix strength are basically consistent with the primary nitriding result, the inner hole size, cylindricity and roughness of the actuator cylinder body can be effectively controlled, and the inner hole is not machined any more, so that the inner hole hardness is ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the technical aspects of the present application and are incorporated in and constitute a part of this specification, illustrate the technical aspects of the present application and together with the examples of the present application, but do not constitute a limitation of the technical aspects of the present application.
FIG. 1 is a schematic illustration of ram charging;
FIG. 2 is a metallographic structure of a nitrided layer after initial nitriding of an actuator cylinder;
FIG. 3 shows the metallographic structure morphology of the core matrix after primary nitriding;
FIG. 4 is a hardness gradient of the primary nitrided layer;
FIG. 5 metallographic structure of nitrided layer after secondary nitriding of actuator cylinder.
In the figure, a 1-rectangular double-hole actuator cylinder, a 2-nitriding tool, a 3-furnace plate, a 21-nitriding tool (lower pad) and a 22-nitriding tool (upper cover).
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is not intended to be any limitation on the invention, its application or use. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be noted that: the relative arrangement of the components and steps set forth in these embodiments should be construed as exemplary only and not as limiting unless specifically stated otherwise.
The invention will be further described with reference to fig. 1-5 by taking a rectangular double-hole actuator cylinder as an example.
The invention provides a nitriding process of an aviation TC6 titanium alloy actuator cylinder, which ensures that the depth of a nitriding layer, the surface hardness and the mechanical properties of a matrix simultaneously meet the requirements by adjusting the nitriding temperature, the nitriding time, honing and secondary nitriding, realizes the effective control of the size, cylindricity and roughness of an inner hole of the TC6 titanium alloy actuator cylinder, ensures that the inner hole is free from additional machining, and ensures the hardness of the inner hole.
The specific process comprises the following steps:
s10, roughly machining a TC6 titanium alloy actuator cylinder (1), reserving 20mm sampling allowance on one side of the outer shape end part of an actuator cylinder body, and reserving 2mm machining allowance on one side of an inner hole.
S20, processing the nitriding tool (2) by adopting the same material according to the end face shape of the actuator cylinder body completed in the S10.
S30, wiping the TC6 titanium alloy actuating cylinder (1) and the nitriding tool (2) by using absolute ethyl alcohol; during wiping, the inner hole wall and the outer wall of the TC6 titanium alloy actuator cylinder (1) and the outer wall of the nitriding tool (2) are wiped.
S40, carrying out vacuum annealing treatment on the rough machining actuator cylinder and the nitriding tool; the vacuum annealing treatment comprises the following specific steps:
s41, placing the actuator cylinder and the nitriding tool into a vacuum annealing furnace.
S42, vacuumizing the vacuum annealing furnace, wherein the vacuum degree after vacuumizing the vacuum annealing furnace is not higher than 5Pa.
S43, heating and preserving heat of the vacuum annealing furnace, wherein the heating rate of the vacuum annealing furnace is 5-10 ℃/min; heating to 800-860 ℃; stopping heating and preserving heat for 2-3 h.
S44, cooling and discharging, naturally cooling the vacuum furnace, and taking out the actuator cylinder and the nitriding tool when the temperature of the vacuum furnace is reduced to 150 ℃.
S50, semi-finishing an inner hole of the actuator cylinder body to phi D (-0.05 mm to-0.10 mm);
s60, finely machining an inner hole of the TC6 titanium alloy actuator cylinder body, honing to phi D (-0.04 mm to minus 0.02 mm), and Ra0.4;
s70, carrying out primary nitriding treatment on the TC6 titanium alloy actuator cylinder, wherein the specific nitriding process comprises the following steps:
s71, loading nitriding tools and an actuating cylinder into a nitriding furnace according to the figure 1, respectively covering (padding) the nitriding tools on the upper end (lower end) of the actuating cylinder body, controlling the positions of orifices at two ends of the actuating cylinder body to generate larger deformation in the nitriding process, then placing a nitriding furnace burden tray, ensuring that the distance between adjacent closest points of any two nitriding parts is not less than 100mm, and avoiding mutual influence in the nitriding process.
S72, filling ammonia gas into the nitriding furnace, exhausting air, and reducing the ammonia gas filling/exhausting speed after the nitriding furnace cavity is filled with the ammonia gas, so that the ammonia gas in the furnace cavity is in a dynamic balance state in the whole nitriding process.
S73, heating and heat-preserving the nitriding furnace, wherein when the nitriding furnace is heated, the heating rate is 5-10 ℃/min, and nitriding is carried out by a three-stage process:
the method comprises the following steps: 400 Preserving heat for 5-6 h at the temperature of +/-10 ℃;
the two-stage process comprises the following steps: 650 Preserving heat for 7-8 h at the temperature of +/-10 ℃;
and (3) a three-stage process, namely, 860 (+ -10) heat preservation for 27-28 h.
And S74, cooling, discharging, stopping filling ammonia gas when the temperature of the nitriding furnace is reduced to be less than 50 ℃, and taking out the actuator cylinder and the nitriding tool to finish nitriding.
S80, single-side linear cutting sampling detection is carried out on the end face of the actuating cylinder body, and detection contents specifically comprise:
s81, detecting the size of the inner hole of the actuating cylinder body, and comparing the size variables of the inner hole before and after nitriding to be not more than 0.08mm.
S82, cutting and sampling by adopting a wire electric discharge machine at one side of the end part of the actuator cylinder body, wherein the sampling thickness is not more than 10mm;
s83, detecting the metallographic appearance of the nitriding layer of the sample, wherein the metallographic appearance is shown in fig. 2, the bright white area of the nitriding layer is about 10um, the nitriding layer (bright white area and diffusion layer) is about 100-150 um and is larger than 100um, and the technical requirements are met.
S84, detecting the metallographic morphology of the core of the sample, wherein the metallographic morphology of the core is shown in figure 3, is basically consistent with the metallographic morphology of the base material before nitriding, and consists of equiaxial alpha phase and needle beta phase.
S85, detecting the hardness gradient of the surface of the sample and the nitriding layer, wherein the detection result is shown in figure 4, the hardness of the surface is 1300HV50g (technical requirement is more than 800 HV), the hardness of the nitriding layer which is 0.02um away from the surface is 540HV50g (technical requirement is more than 500 HV), and the detection results all meet the technical requirements.
S86, detecting the mechanical properties of the sample, wherein the detection results and the technical requirements are shown in the following table 1, and the non-proportional extension strength Rp0.2, the tensile strength Rm, the elongation after break A, the reduction of area Z and the impact toughness are specified to meet the technical requirements.
Table 1 mechanical properties test results and technical requirements after primary nitriding of TC6 titanium alloys:
s90, honing an inner hole of the actuator cylinder body to the drawing size of the part, wherein the surface hardness of the inner hole of the actuator cylinder body after honing is not less than 500HV, and the actual measured value of the surface hardness of the inner hole after honing is 520HV100g, so that the technical requirements are met.
S100, carrying out secondary nitriding treatment on the TC6 titanium alloy actuator cylinder, and repeating the operation of S70 in the heat treatment process, wherein the heat preservation temperature of the three-stage process in S3 is reduced by 30-50 ℃, and the heat preservation time is reduced to 20-21 h.
S110, single-side linear cutting sampling detection is carried out on the end face of the actuator cylinder body, and the detection content specifically comprises:
s111, detecting the size of the inner hole of the actuating cylinder body, and ensuring that the size of the inner hole meets the technical requirements of drawings after secondary nitriding.
S112, cutting and sampling by adopting a wire electric discharge machine at one side of the end part of the actuator cylinder body, wherein the sampling thickness is not more than 10mm;
s113, detecting the metallographic appearance of the nitriding layer of the sample, wherein the metallographic appearance is shown in FIG. 5, the depth of the nitriding layer exceeds 200um, and the technical requirements are met.
S114, detecting the metallographic morphology of the core of the sample, wherein the metallographic morphology of the core of the sample is basically consistent with that of the base material before nitriding, and the core of the sample is composed of an equiaxial alpha phase and a needle beta phase.
S115, detecting the hardness of the surface of the sample and the hardness gradient of the nitriding layer, wherein the detection result is as follows: the surface hardness is greater than 8800HV100g (technical requirement is more than 800 HV), the hardness of the nitriding layer with the thickness of 0.02um from the surface is 524HV100g (technical requirement is more than 500 HV), and the technical requirements are met.
S116, detecting the mechanical properties of the sample, wherein the detection result shows that the specified non-proportional extension strength Rp0.2, the tensile strength Rm, the elongation after break A, the area shrinkage Z and the impact toughness aK all meet the technical requirements.
S120, machining the appearance of the TC6 titanium alloy actuator cylinder to be 0.1 mm;
s130, repeating the step S40 for the actuator cylinder processed in the step S120, and performing vacuum stress relief annealing treatment;
s140, processing the appearance of the TC6 titanium alloy actuator cylinder to the drawing size;
s150, performing fluorescent flaw detection on the TC6 titanium alloy actuator cylinder, wherein a fluorescent scalding result meets the technical requirements of a drawing;
s160, detecting the inner hole size, the inner hole surface roughness and the outline size of the actuating cylinder body, wherein the detection results all meet the requirements of a drawing.
Compared with the prior art, the method can effectively control the deformation of the TC6 titanium alloy actuator cylinder for aviation by optimizing the nitriding temperature and nitriding time, honing and secondary nitriding, so that the depth of a nitriding layer, the surface hardness and the mechanical properties of a matrix can meet the requirements.
After primary nitriding treatment, the surface hardness of the TC6 titanium alloy actuator cylinder for aerospace can reach more than 800HV, the hardness of the position 0.02mm away from the surface can reach more than 500HV, the deformation of an inner hole can be controlled within 0.08mm, the mechanical strength of a matrix meets the requirements of national army standard GJB2218A and national standard GB/T2965, after stress relief annealing, honing and secondary nitriding treatment, the surface hardness can reach 800HV, the hardness gradient, metallographic morphology and matrix strength are basically consistent with the primary nitriding result, the inner hole size, cylindricity and roughness of the actuator cylinder body can be effectively controlled, and the inner hole is not machined any more, so that the inner hole hardness is ensured.
So far, some specific embodiments of the invention have been described in detail by way of example, it will be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (8)
1. The nitriding processing method of the TC6 titanium alloy actuator cylinder for aerospace is characterized by comprising an actuator cylinder body, a fixed shaft and a cover plate, and comprises the following steps of:
s10, roughly machining an actuator cylinder body, a fixed shaft and a cover plate, reserving 20mm on one side of the end part of the actuator cylinder body, and reserving 2mm on one side of an inner hole;
s20, processing a nitriding tool according to the end shape of the actuator cylinder body completed in the step S10;
s30, wiping the actuating cylinder body, the fixed shaft, the cover plate and the nitriding tool, and drying by adopting oil-free compressed air or nitrogen;
s40, carrying out vacuum stress relief annealing treatment on the TC6 titanium alloy actuating cylinder and the nitriding tool after rough machining;
s50, semi-finishing an inner hole of the actuator cylinder body to be smaller than the designed diameter of 0.05-0.10 mm;
s60, finely machining an inner hole of the actuator cylinder body, honing the inner hole of the actuator cylinder body to be smaller than the designed diameter of 0.04-0.02 mm, and enabling the roughness Ra0.4;
s70, performing primary nitriding treatment on the TC6 titanium alloy actuator cylinder;
s80, performing unilateral linear cutting sampling detection on the end face of the actuator cylinder body;
s90, honing an inner hole of the actuator cylinder body to a design size;
s100, carrying out secondary nitriding treatment on the TC6 titanium alloy actuator cylinder;
s110, performing unilateral linear cutting sampling detection on the end face of the actuator cylinder body;
s120, machining the appearance of the actuator cylinder body to a margin of 0.1 mm;
s130, carrying out vacuum stress relief annealing treatment on the TC6 titanium alloy actuator cylinder and the nitriding tool which are processed in the step S120;
s140, machining the appearance of the actuator cylinder body to a design size;
s150, performing fluorescent flaw detection on the actuator cylinder body; and
s160, detecting the inner hole size, the inner hole surface roughness and the external dimension of the actuating cylinder body;
in the step S70, the step of performing the primary nitriding treatment on the actuator body, the fixed shaft and the cover plate includes:
s71, loading the actuating cylinder body, the fixed shaft, the cover plate and the nitriding tools into a nitriding furnace, respectively and fixedly mounting the nitriding tools at two ends of the actuating cylinder body, then loading nitriding furnace trays, and ensuring that the distance between adjacent closest points of any two nitriding parts of the actuating cylinder body, the fixed shaft and the cover plate is not less than 100mm;
s72, filling ammonia gas into the nitriding furnace, exhausting air, and reducing the filling or exhausting speed of the ammonia gas after the furnace chamber of the nitriding furnace is filled with the ammonia gas, so that the concentration of the ammonia gas in the furnace chamber is kept constant in the nitriding process;
s73, heating the nitriding furnace at a heating rate of 5-10 ℃/min, and nitriding the nitriding furnace in three sections, wherein the first section is used for keeping the nitriding furnace at 400+/-10 ℃ and preserving heat for 5-6 hours, the second section is used for keeping the nitriding furnace at 650+/-10 ℃ and preserving heat for 7-8 hours, and the third section is used for keeping the nitriding furnace at 860+/-10 ℃ and preserving heat for 27-28 hours;
s74, stopping filling ammonia gas when the temperature of the nitriding furnace is reduced to be less than 50 ℃, and taking out the actuator cylinder body, the nitriding tool, the fixed shaft and the cover plate to finish nitriding;
in the step S100, the step of performing the secondary nitriding treatment on the cylinder body, the fixed shaft and the cover plate includes:
s101, loading an actuating cylinder body, a fixed shaft, a cover plate and nitriding tools into a nitriding furnace, respectively and fixedly mounting the nitriding tools at two ends of the actuating cylinder body to prevent dimension deformation of orifice positions at two ends of the actuating cylinder body in the nitriding process, and then putting into a nitriding furnace tray, wherein the distance between adjacent closest points of any two nitriding parts in the actuating cylinder body, the fixed shaft and the cover plate is not less than 100mm to avoid mutual influence of the nitriding parts in the nitriding process;
s102, filling ammonia gas into a nitriding furnace, exhausting air, and reducing the filling or exhausting speed of the ammonia gas after the furnace chamber of the nitriding furnace is filled with the ammonia gas, so that the concentration of the ammonia gas in the furnace chamber is kept constant in the nitriding process;
s103, heating the nitriding furnace at a heating rate of 5-10 ℃/min, and nitriding the nitriding furnace in three sections, wherein the first section is used for keeping the nitriding furnace at 400+/-10 ℃ and preserving heat for 5-6 hours, the second section is used for keeping the nitriding furnace at 650+/-10 ℃ and preserving heat for 7-8 hours, and the third section is used for keeping the nitriding furnace at 820+/-10 ℃ and preserving heat for 20-21 hours;
s104, stopping filling ammonia gas when the temperature of the nitriding furnace is reduced to be less than 50 ℃, and taking out the actuator cylinder body, the nitriding tool, the fixed shaft and the cover plate to finish nitriding;
wherein, in the step S40 and the step S130, the step of vacuum annealing treatment includes:
putting the actuating cylinder body, the fixed shaft, the cover plate and the nitriding tool into a vacuum annealing furnace;
vacuumizing the vacuum annealing furnace, wherein the vacuum degree of the vacuumized vacuum annealing furnace is not more than 5Pa;
heating the vacuum annealing furnace at a heating rate of 5-10 ℃/min until the temperature reaches 800-860 ℃, stopping heating, and preserving the heat for 2-3 hours; and
and naturally cooling the vacuum furnace, and discharging the actuating cylinder body, the fixed shaft, the cover plate and the nitriding tool when the temperature of the vacuum furnace is reduced to 150 ℃.
2. The nitriding method according to claim 1, wherein in step S10, the cylinder body includes a columnar single-hole cylinder structure, a rectangular double-hole cylinder structure, and a rectangular single-hole cylinder structure.
3. The nitriding method according to claim 1, wherein in said step S20, the nitriding tool is made of the same material as that of the cylinder body.
4. The nitriding method according to claim 1, wherein in the step S30, absolute ethyl alcohol is used to wipe the outer wall and inner hole wall of the cylinder body, the outer wall of the fixed shaft, the outer wall and inner hole of the cover plate, and the outer wall of the nitriding tool.
5. The nitriding method according to claim 1, wherein in said step S80, the sampling detection of the cylinder body includes the steps of:
s81, detecting the size of an inner hole of the actuating cylinder body, wherein the diameter variation of the inner hole before and after nitriding is not more than 0.08mm;
s82, cutting and sampling by adopting a wire electric discharge machine at one side of the end part of the actuator cylinder body, wherein the sampling thickness is not more than 10mm;
s83, detecting a metallographic structure of a nitriding layer of the sample piece, wherein the thickness of the nitriding layer is not less than 100 mu m;
s84, detecting the metallographic morphology of the core of the sample, wherein the metallographic phase of the base material of the core base Jin Xiangyu before nitriding is not obviously changed after nitriding, and the base material is composed of an equiaxial alpha phase and a needle beta phase;
s85, detecting the hardness gradient of the surface of the sample and the hardness gradient of the nitriding layer, wherein the hardness of the surface after nitriding is not less than 800HV, and the hardness of the nitriding layer which is 0.02mm deep from the surface is not less than 500HV;
s86, detecting the mechanical property of the sample, including prescribing non-proportional extension strength Rp 0.2 More than or equal to 880MPa, tensile strength Rm of 980-1180MPa, elongation after fracture A of more than or equal to 10%, shrinkage Z of more than or equal to 25% and impact toughness aK of more than or equal to30J/m2。
6. The nitriding method according to claim 1, wherein in said step S90, the hardness of the inner bore surface of the cylinder body after honing is not less than 500HV.
7. The nitriding method according to claim 1, wherein in said step S110, the step of sampling and detecting the cylinder body includes:
s111, detecting that the size of the inner hole of the actuator cylinder body meets the design requirement;
s112, cutting and sampling by adopting a wire electric discharge machine at one side of the end part of the actuator cylinder body, wherein the sampling thickness is not more than 10mm;
s113, detecting a metallographic structure of a nitriding layer of the sample piece, wherein the thickness of the nitriding layer is not less than 100 mu m;
s114, detecting the metallographic morphology of the core of the sample, wherein the metallographic phase of the base material of the core base Jin Xiangyu before nitriding is not obviously changed after nitriding, and the base material is composed of an equiaxial alpha phase and a needle beta phase;
s115, detecting the hardness gradient of the surface of the sample and the hardness gradient of the nitriding layer, wherein the hardness of the surface after nitriding is not less than 800HV, and the hardness of the nitriding layer which is 0.02mm deep from the surface is not less than 500HV;
s116, detecting the mechanical property of the sample, including prescribing non-proportional extension strength Rp 0.2 More than or equal to 880MPa, tensile strength Rm is 980-1180MPa, elongation after fracture A is more than or equal to 10%, area shrinkage Z is more than or equal to 25%, and impact toughness aK is more than or equal to 30J/m < 2 >.
8. The nitriding method according to claim 1, wherein in said step S150, it is judged that the result of the fluorescent flaw detection meets the design requirements, and in said step S160, it is judged that the inner hole size, the inner hole surface roughness, the outer dimension, and the outer surface roughness of the cylinder body meet the design requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111358908.6A CN114196905B (en) | 2021-11-17 | 2021-11-17 | Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111358908.6A CN114196905B (en) | 2021-11-17 | 2021-11-17 | Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114196905A CN114196905A (en) | 2022-03-18 |
| CN114196905B true CN114196905B (en) | 2024-02-27 |
Family
ID=80647778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111358908.6A Active CN114196905B (en) | 2021-11-17 | 2021-11-17 | Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114196905B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114799738B (en) * | 2022-03-24 | 2023-12-22 | 新疆湘润新材料科技有限公司 | Preparation method of TC4 titanium alloy thin-wall ring material |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019091222A1 (en) * | 2017-11-13 | 2019-05-16 | 常州天山重工机械有限公司 | Heat treatment method for controlling nitride in 31crmov9 gear material |
| CN111636046A (en) * | 2020-05-09 | 2020-09-08 | 北京卫星制造厂有限公司 | Local ion nitriding method for deep cavity threads of titanium alloy part |
| CN112159951A (en) * | 2020-10-26 | 2021-01-01 | 杭州汽轮机股份有限公司 | Preparation process of water erosion resistant layer of titanium alloy blade of steam turbine |
| WO2021154360A1 (en) * | 2020-01-30 | 2021-08-05 | Cummins Inc. | Two-stage gas nitriding process for improved wear and erosion resistance |
| CN113416915A (en) * | 2021-06-04 | 2021-09-21 | 无锡晶龙华特电工有限公司 | Nitriding treatment process of cold-rolled oriented electrical steel strip |
-
2021
- 2021-11-17 CN CN202111358908.6A patent/CN114196905B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019091222A1 (en) * | 2017-11-13 | 2019-05-16 | 常州天山重工机械有限公司 | Heat treatment method for controlling nitride in 31crmov9 gear material |
| WO2021154360A1 (en) * | 2020-01-30 | 2021-08-05 | Cummins Inc. | Two-stage gas nitriding process for improved wear and erosion resistance |
| CN111636046A (en) * | 2020-05-09 | 2020-09-08 | 北京卫星制造厂有限公司 | Local ion nitriding method for deep cavity threads of titanium alloy part |
| CN112159951A (en) * | 2020-10-26 | 2021-01-01 | 杭州汽轮机股份有限公司 | Preparation process of water erosion resistant layer of titanium alloy blade of steam turbine |
| CN113416915A (en) * | 2021-06-04 | 2021-09-21 | 无锡晶龙华特电工有限公司 | Nitriding treatment process of cold-rolled oriented electrical steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114196905A (en) | 2022-03-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Çiçek et al. | Performance of cryogenically treated M35 HSS drills in drilling of austenitic stainless steels | |
| CN114196905B (en) | Nitriding processing method of TC6 titanium alloy actuator cylinder for aerospace | |
| HE et al. | Formability and microstructure of AA6061 Al alloy tube for hot metal gas forming at elevated temperature | |
| EP3118346B1 (en) | Nitriding method and nitrided part production method | |
| EP1288328A1 (en) | Method for surface hardening a Ti alloy | |
| SE526481C2 (en) | Surface hardened stainless steel with improved abrasion resistance and low static friction | |
| JPWO2008059791A1 (en) | Chromium nitride ion plating film, method for producing the same, and piston ring for internal combustion engine | |
| US9790583B2 (en) | High temperature nitriding of titanium parts | |
| KR20120036971A (en) | Coated tooling | |
| CN103602946B (en) | A kind of method improving Shaft of Titanium Alloy seat surface wear resistance | |
| TWI554621B (en) | Manufacturing method for cold-working die | |
| US6592683B2 (en) | Ti alloy surface treatment | |
| CN105908120A (en) | Ion nitriding-low pressure oxidation composite treatment method of aluminum alloy die-casting die or die steel | |
| TWI474911B (en) | Thread rolling die | |
| JP4357160B2 (en) | Sputtering target, hard coating using the same, and hard film coating member | |
| JP2007262535A (en) | Wear resistant titanium member | |
| US6551954B1 (en) | WC-base composite ceramic sintered compact | |
| CN110656301B (en) | Preparation method of controllable nitriding-PVD (physical vapor deposition) composite coating for high-speed steel tool | |
| JP2018039045A (en) | Covering cold metal mold | |
| US7600499B2 (en) | Titanium alloy valve lifter | |
| CN113930716A (en) | Ion nitriding method for ultrahigh-strength stainless steel gear | |
| Su et al. | Comparison of wear, tensile, and fatigue properties of PVD coated materials | |
| Tesi et al. | Analysis of surface structures and of size and shape variations in ionitrided precipitation hardening stainless steel samples | |
| CN113290247A (en) | Hot isostatic pressing forming/carburizing process for titanium alloy thin-wall part | |
| Başaran et al. | Investigation of fatigue properties of shot peened and plasma nitrocarburized P/M FC0205 steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20221031 Address after: 721000 No. 6 Workshop, Phase IV, High tech Equipment Industrial Park, Gaoxin Second Road, Baoji Hi tech Development Zone, Shaanxi Province Applicant after: Shaanxi Zhenming New Material Technology Co.,Ltd. Address before: 721013 No. 5, phase 4, high-end equipment Park, Gaoxin Second Road, high tech Development Zone, Baoji City, Shaanxi Province Applicant before: Shaanxi taibofeite Aviation Manufacturing Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |