CN113528776A - Hot isostatic pressing heat treatment method for large stainless steel casting with complex structure - Google Patents
Hot isostatic pressing heat treatment method for large stainless steel casting with complex structure Download PDFInfo
- Publication number
- CN113528776A CN113528776A CN202110813240.3A CN202110813240A CN113528776A CN 113528776 A CN113528776 A CN 113528776A CN 202110813240 A CN202110813240 A CN 202110813240A CN 113528776 A CN113528776 A CN 113528776A
- Authority
- CN
- China
- Prior art keywords
- casting
- stainless steel
- hot isostatic
- isostatic pressing
- heat treatment
- 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.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Powder Metallurgy (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a hot isostatic pressing heat treatment method for a large stainless steel casting with a complex structure, which is characterized in that the casting is kept at 1160-1170 ℃ and 130-140 MPa for 4 hours +/-15 minutes under the condition of pressure maintaining, and then argon is filled for furnace cooling. According to the invention, by carrying out hot isostatic pressing on the large-scale stainless steel casting with the complex structure, the chemical components and the matrix structure of the casting are not changed, the micro-porosity is obviously improved, the porosity grade of X-ray flaw detection is improved by 2-3 grades, and the mechanical property level is improved.
Description
Technical Field
The invention relates to the technical field of heat treatment of large stainless steel castings with complex structures, in particular to a hot isostatic pressure heat treatment method for large stainless steel castings with complex structures, which can reduce defects of casting holes and casting deformation and reduction of structure uniformity of the castings caused by repair welding.
Background
The large stainless steel inlet end casing casting with a complex structure is a main component forming a large naval engine (providing power and motive power for large military and civil ships), has complex structural design and large wall thickness difference, and puts more rigorous requirements on metal base materials and processing technologies thereof.
The near-net-shape investment precision casting technology is the most important technology for preparing large-scale complex structural parts of engines at home and abroad. The technology comprises the steps of manufacturing a wax mould by using a fusible wax material, then manufacturing a ceramic shell, roasting the ceramic shell after the wax mould is fused off, finally pouring molten metal into the shell, and cleaning the shell after the molten metal is solidified and cooled to obtain the required casting. By strictly controlling the casting material, each process link and process factors in the casting forming process and carrying out necessary heat treatment, the near-net-shaped casting with a working surface without mechanical processing or only local grinding can be obtained. Therefore, the investment precision casting technology has the advantages of high casting size precision and low surface roughness, and can be used for casting large thin-wall complex-structure castings with complex shapes and structures.
When a large-scale stainless steel casting with a complex structure is produced by adopting an investment precision casting technology, the casting is filled, cooled and solidified under the gravity, and the inside of the casting has pore defects such as looseness, shrinkage cavities and the like with different degrees, and if the pore defects exceed a certain limit, the pore defects need to be removed, usually, the defect positions are ascertained by utilizing a nondestructive testing technology, then the defects are removed and repair welding is carried out, so that the local deformation and the tissue uniformity of the casting are reduced with different degrees even though heat treatment is carried out, and in addition, the existence of more pore defects without exceeding the standard is added, so that the service performance of the casting is reduced to a certain degree; and repair welding will prolong the production cycle of the casting.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hot isostatic pressing heat treatment method for large stainless steel castings with complex structures, which can reduce the defects of casting holes and casting deformation and reduction of structure uniformity caused by repair welding.
In order to solve the technical problems, the hot isostatic pressing heat treatment method for the large stainless steel casting with the complex structure, provided by the invention, is characterized in that the casting is kept at 1160-1170 ℃ and 130-140 MPa and is kept at the pressure for 225-255 minutes, and then argon is filled or furnace cooling is carried out.
The hot isostatic pressing heat treatment method for the large stainless steel casting with the complex structure comprises the following steps:
s1, removing the surface defects of the casting and completing repair welding;
s2, loading the casting into a hot isostatic pressing furnace to close the furnace at room temperature;
s3, filling argon with the purity not lower than 99.999 percent, and heating to 1160-1170 ℃;
s4, preserving heat and pressure for 4 hours plus or minus 15 minutes under the conditions of 1160-1170 ℃, 130-140 MPa temperature and pressure;
s5, filling argon with the purity not lower than 99.999 percent or cooling along with the furnace, and taking out the casting.
Further, the casting is a ZG1Cr17Ni3 stainless steel air inlet casing.
The invention has the technical effects that: 1. hot isostatic pressing tests and actual production verification of large stainless steel castings with complex structures show that the chemical components and the structures of the castings are unchanged, and the mechanical properties, uniformity and stability of the castings are improved; 2. the porosity grade of the casting radiographic inspection is improved by 2-3 grades, the porosity of the machined surface of the casting subjected to fluorescent inspection is basically eliminated, the micro-porosity is obviously improved, repair welding of the casting caused by the porosity and shrinkage cavity is basically eliminated, and the dimensional stability of the casting is obviously improved.
Drawings
The invention is described in further detail below with reference to the drawings of the specification:
FIG. 1a is a photograph of the inner ring porosity rating before hot isostatic pressing heat treatment of ZG1Cr17Ni3 stainless steel inlet box casting A in example 1 of the present invention;
FIG. 1b is a photograph of the ring porosity rating after hot isostatic pressing heat treatment of ZG1Cr17Ni3 stainless steel inlet box casting A in example 1 of the present invention;
FIG. 2a is a photograph of the inner ring porosity rating before HIP of ZG1Cr17Ni3 stainless steel inlet box casting B in example 2 of the present invention;
FIG. 2B is a photograph of the post-HIP inner ring porosity grade of ZG1Cr17Ni3 stainless steel inlet box casting B in example 2 of the present invention;
FIG. 3a is a metallographic photograph of a casting coupon for ZG1Cr17Ni3 stainless steel inlet casing casting B before hot isostatic pressing heat treatment in example 2 of the present invention;
FIG. 3B is a metallographic photograph of a casting coupon for ZG1Cr17Ni3 stainless steel inlet casing casting B after HIP treatment in example 2 of the present invention;
FIG. 4a is a metallographic photograph of a casting coupon prior to hot isostatic pressing of ZG1Cr17Ni3 stainless steel inlet box casting C in example 3 of the present invention;
FIG. 4b is a metallographic photograph of a casting coupon after hot isostatic pressing of ZG1Cr17Ni3 stainless steel inlet casing casting C in example 3 in accordance with the invention;
FIG. 5a is a metallographic photograph of carbides and ferrites in a tempered condition of a casting coupon of ZG1Cr17Ni3 stainless steel inlet box casting B of example 2 of the present invention without hot isostatic pressing;
FIG. 5B is a metallographic photograph of carbides and ferrites in a tempered state of a casting coupon after Hot Isostatic Pressing (HIP) treatment of ZG1Cr17Ni3 stainless steel inlet casing casting B in example 2 of the present invention;
FIG. 6a is a metallographic photograph of carbides and ferrites in a tempered condition of a cast-on-steel sample of ZG1Cr17Ni3 stainless steel inlet box casting C of example 3 of the present invention without hot isostatic pressing;
FIG. 6b is a metallographic photograph of carbides and ferrites in a tempered state of a casting coupon after Hot Isostatic Pressing (HIP) treatment of ZG1Cr17Ni3 stainless steel inlet casing casting C in example 2 of the present invention; .
Detailed Description
Example 1
The embodiment is a ZG1Cr17Ni3 stainless steel air inlet casing A, the maximum diameter phi of a casting is 904mm, the height is 237mm, and the maximum thickness is 30 mm; the casting comprises the following chemical components in percentage by mass: c: 0.105%; cr: 16.32 percent; ni: 3.25 percent; mn: 0.50 percent; 1.19 percent of Si; the balance being iron and unavoidable impurities.
Example 2
The embodiment is a ZG1Cr17Ni3 stainless steel air inlet casing B, the maximum diameter phi of a casting is 904mm, the height is 237mm, and the maximum thickness is 30 mm; the casting comprises the following chemical components in percentage by mass: c: 0.105%; cr: 16.29 percent; ni: 3.20 percent; mn: 0.51 percent; 1.19 percent of Si; the balance being iron and unavoidable impurities.
Example 3
The embodiment is a ZG1Cr17Ni3 stainless steel air inlet casing C, the maximum diameter phi of a casting is 904mm, the height is 237mm, and the maximum thickness is 30 mm; the casting comprises the following chemical components in percentage by mass: c: 0.107%; cr: 16.28 percent; ni: 3.25 percent; mn: 0.53 percent; 1.17 percent of Si; the balance being iron and unavoidable impurities.
Example 4
The hot isostatic pressing heat treatment method for the ZG1Cr17Ni3 stainless steel inlet casing, which is described in the above embodiments 1-3, comprises the following steps:
s1, removing the surface defects of the ZG1Cr17Ni3 stainless steel air inlet casing and completing repair welding;
s2, putting a ZG1Cr17Ni3 stainless steel gas inlet box into a hot isostatic pressing furnace to close the furnace at room temperature;
s3, filling argon with the purity not lower than 99.999 percent, and heating to 1160-1170 ℃;
s4, preserving heat and pressure for 4 hours plus or minus 15 minutes under the conditions of 1160-1170 ℃, 130-140 MPa temperature and pressure;
s5, filling argon with the purity not lower than 99.999 percent or cooling along with the furnace, and taking out the ZG1Cr17Ni3 stainless steel gas inlet casing.
Respectively sampling ZG1Cr17Ni3 stainless steel air inlet casing castings subjected to the hot isostatic pressing heat treatment in the embodiments 1-3, and carrying out chemical element analysis by using equipment such as a fluorescence spectrometer, ICP (inductively coupled plasma) and a gas joint measuring instrument, wherein specific component comparison is shown in Table 1; the mechanical properties of the ZG1Cr17Ni3 stainless steel air inlet casing casting attached casting samples are compared and shown in Table 2.
TABLE 1 ZG1Cr17Ni3 comparison of test results for components of stainless steel inlet casing castings
As can be seen from the comparison of the chemical compositions in Table 1, the ZG1Cr17Ni3 stainless steel inlet box casting has satisfactory chemical compositions and has no change before and after hot isostatic pressing heat treatment.
TABLE 2 comparison of mechanical properties of ZG1Cr17Ni3 stainless steel air inlet casing casting attached casting samples
As can be seen from the comparison result of the mechanical properties of the casting attached casting samples in the table 2, the mechanical properties meet the requirements, and the mechanical properties are improved after the hot isostatic pressing heat treatment.
The ZG1Cr17Ni3 stainless steel air inlet casing casting in the embodiments 1 and 2 is subjected to X-ray flaw detection inspection according to the parts specified by the acceptance specifications, and the outer ring porosity grade is improved to 1-2 grade from 4-5 grade before hot isostatic pressing heat treatment; the inner ring porosity grade is improved to 2-3 grade from 5-6 grade before hot isostatic pressing heat treatment, wherein the flaw detection pictures of the inner ring porosity grade are shown in fig. 1a, 1b, 2a and 2 b.
The ZG1Cr17Ni3 stainless steel inlet casing castings after the hot isostatic pressing heat treatment described in the examples 1-3 are subjected to fluorescence penetrant inspection according to acceptance criteria, loose defects are not found, the fluorescence result is obviously improved compared with batch products, and loose defects are not found on the processed surfaces.
100-fold micro-porosity comparison was performed on each of the hot isostatic pressed samples and the non-hot isostatic pressed samples of ZG1Cr17Ni3 stainless steel inlet box castings of examples 2 and 3, and the comparison results showed that the non-hot pressed samples had a micro-porosity of 200um, and the hot pressed samples had substantially no micro-porosity, and the metallographic photographs of the samples are shown in FIG. 3a, FIG. 3b, FIG. 4a and FIG. 4 b.
The carbide and ferrite of each of the hot isostatic pressed samples and the non-hot isostatic pressed samples of ZG1Cr17Ni3 stainless steel inlet box castings of examples 2 and 3 were compared, and the comparison result shows that the carbide and ferrite of the hot isostatic pressed samples and the non-hot isostatic pressed samples have no significant change, and the metallographic photographs are shown in FIG. 5a, FIG. 5b, FIG. 6a and FIG. 6 b.
Through the hot isostatic pressing heat treatment experiment and the actual production verification of the ZG1Cr17Ni3 stainless steel air inlet box casting, the chemical composition and the structure of the ZG1Cr17Ni3 stainless steel air inlet box casting are not changed, and the mechanical property, the uniformity and the stability are improved; the loosening grade of the ZG1Cr17Ni3 stainless steel air inlet box casting in the radiographic inspection is improved by 2-3 grades, the loosening of the machining surface of the ZG1Cr17Ni3 stainless steel air inlet box casting in the fluorescent inspection is basically eliminated, the micro loosening is obviously improved, the repair welding of the ZG1Cr17Ni3 stainless steel air inlet box casting caused by loosening and shrinkage is basically eliminated, and the dimensional stability of the ZG1Cr17Ni3 stainless steel air inlet box casting is obviously improved.
It should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious variations or modifications which fall within the spirit of the invention are intended to be covered by the scope of the present invention.
Claims (3)
1. A hot isostatic pressing heat treatment method for a large stainless steel casting with a complex structure is characterized in that the casting is kept at 1160-1170 ℃ and 130-140 MPa and is kept at the pressure for 225-255 minutes, and then argon is filled or furnace cooling is carried out.
2. The hot isostatic pressing heat treatment method for large complex structured stainless steel castings according to claim 1, characterized in that,
comprises the following steps of (a) carrying out,
s1, removing the surface defects of the casting and completing repair welding;
s2, loading the casting into a hot isostatic pressing furnace to close the furnace at room temperature;
s3, filling argon with the purity not lower than 99.999 percent, and heating to 1160-1170 ℃;
s4, preserving heat and pressure for 4 hours plus or minus 15 minutes under the conditions of 1160-1170 ℃, 130-140 MPa temperature and pressure;
s5, filling argon with the purity not lower than 99.999 percent or cooling along with the furnace, and taking out the casting.
3. The method of hot isostatic pressing heat treatment of large complex structured stainless steel castings according to claim 2, wherein the castings are ZG1Cr17Ni3 stainless steel inlet casings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110813240.3A CN113528776A (en) | 2021-07-19 | 2021-07-19 | Hot isostatic pressing heat treatment method for large stainless steel casting with complex structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110813240.3A CN113528776A (en) | 2021-07-19 | 2021-07-19 | Hot isostatic pressing heat treatment method for large stainless steel casting with complex structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113528776A true CN113528776A (en) | 2021-10-22 |
Family
ID=78100167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110813240.3A Pending CN113528776A (en) | 2021-07-19 | 2021-07-19 | Hot isostatic pressing heat treatment method for large stainless steel casting with complex structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113528776A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2048146A (en) * | 1979-04-25 | 1980-12-10 | Us Energy | Process for treating weldments |
| JP2008050665A (en) * | 2006-08-25 | 2008-03-06 | Hitachi Metals Ltd | Method of manufacturing steel casting part made of martensitic stainless steel |
| CN109055694A (en) * | 2018-07-20 | 2018-12-21 | 沈阳鼓风机集团核电泵业有限公司 | The heat treatment process and application of one seed nucleus main pump casting impeller |
| CN112226598A (en) * | 2020-10-21 | 2021-01-15 | 浙江工业职业技术学院 | Hot isostatic pressing process for aviation special-shaped pipe casting |
-
2021
- 2021-07-19 CN CN202110813240.3A patent/CN113528776A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2048146A (en) * | 1979-04-25 | 1980-12-10 | Us Energy | Process for treating weldments |
| JP2008050665A (en) * | 2006-08-25 | 2008-03-06 | Hitachi Metals Ltd | Method of manufacturing steel casting part made of martensitic stainless steel |
| CN109055694A (en) * | 2018-07-20 | 2018-12-21 | 沈阳鼓风机集团核电泵业有限公司 | The heat treatment process and application of one seed nucleus main pump casting impeller |
| CN112226598A (en) * | 2020-10-21 | 2021-01-15 | 浙江工业职业技术学院 | Hot isostatic pressing process for aviation special-shaped pipe casting |
Non-Patent Citations (1)
| Title |
|---|
| 王坤兴: "用热等静压法消除不锈钢焊缝的缺陷", 《现代兵器》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2019181572A (en) | Ceramic core compositions, methods for making cores, methods for casting hollow titanium-containing articles, and hollow titanium-containing articles | |
| WO2002095080A2 (en) | Castings of metallic alloys fabricated in anisotropic pyrolytic graphite molds under vacuum | |
| CN112828310B (en) | Method for improving toughness of 3D printing nickel-based high-temperature alloy part | |
| Klotz et al. | Investment casting of titanium alloys with calcium zirconate moulds and crucibles | |
| US20150078912A1 (en) | Ceramic core compositions, methods for making cores, methods for casting hollow titanium-containing articles, and hollow titanium-containing articles | |
| Lin et al. | Effect of yttria inclusion on room temperature tensile properties of investment cast TiAl | |
| CN105268906B (en) | Casting mold with silicon carbide classification | |
| Voigt et al. | Effect of the filter surface chemistry on the filtration of aluminum | |
| JP5096872B2 (en) | Application tool tip member and application tool having the same | |
| Bassini et al. | Net shape HIPping of a Ni-superalloy: A study of the influence of an as-leached surface on mechanical properties | |
| CN113528776A (en) | Hot isostatic pressing heat treatment method for large stainless steel casting with complex structure | |
| Tillmann et al. | Vacuum brazing of 316L stainless steel based on additively manufactured and conventional material grades | |
| CN105466718B (en) | A kind of titanium-aluminium alloy near-net-shape complex structural member acceptance sampling method | |
| Varfolomeev et al. | Interaction of a Ceramic Casting Mold Material of the Al 2 O 3–Al 2 O 3 Composition with a Nickel-Based Superalloy | |
| Szkliniarz et al. | Fundamentals of manufacturing technologies for aircraft engine parts made of TiAl based alloys | |
| CN112226598B (en) | Hot isostatic pressing process for aviation special-shaped pipe casting | |
| Szymański et al. | Attempts to prepare precision composite castings by sintering Al2O3/AlSi11 using underpressure | |
| JP2003119554A (en) | Method for manufacturing fiber reinforced metal | |
| Karwiński et al. | The technology of precision casting of titanium alloys by centrifugal process | |
| US4082548A (en) | Highcreep-resistant cobalt-base alloy | |
| CN114643337B (en) | Preparation method of barrel-type ZL208 alloy | |
| Fujii et al. | Interfacial properties of bonded dissimilar materials fabricated via spark plasma sintering | |
| Balasubramanian et al. | Novel fatigue tester for additively manufactured metals | |
| Chatterjee et al. | Realization of High Pressure Turbine Blades of a Small Turbo-Fan Engine through Investment Casting Process. | |
| KR102623463B1 (en) | Part manufacturing method using Near-Net Shape powder metallurgy and parts manufactured by this manufacturing method |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211022 |
|
| RJ01 | Rejection of invention patent application after publication |