CN116121493A - Heat treatment method of high-strength and high-toughness light wear-resistant high-manganese steel casting - Google Patents
Heat treatment method of high-strength and high-toughness light wear-resistant high-manganese steel casting Download PDFInfo
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- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/02—Hardening by precipitation
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- 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
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
- C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
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- 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
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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Abstract
The invention relates to a heat treatment method of a high-strength and high-toughness light wear-resistant high manganese steel casting, which comprises the following steps: pretreatment: coating an anti-oxidation protective coating on the surface of the high manganese steel casting; and (3) water toughening treatment: heating the high manganese steel casting at a preset speed to reach a water toughness temperature, preserving heat and then quenching; and (3) deep cooling treatment: cooling the high manganese steel casting after water toughening to the cryogenic treatment temperature, and preserving heat; aging treatment: heating the high manganese steel casting subjected to the cryogenic treatment to an aging temperature for heat preservation, then air-cooling to room temperature, wherein the interval between the cryogenic treatment and the aging treatment is not more than 1h; shot blasting: and (5) performing shot blasting on the surface of the high manganese steel casting subjected to ageing treatment. The invention utilizes the combination of water toughness, deep cooling and aging treatment to obtain a single austenite structure, obtains the effective dispersed nano-scale carbide structure, and effectively improves the grain refinement and solid solution strengthening effects of the high-strength and high-toughness light-weight high-manganese steel.
Description
Technical Field
The invention relates to the technical field of heat treatment of light high-manganese steel, in particular to a heat treatment method of a high-strength and high-toughness light wear-resistant high-manganese steel casting.
Background
High manganese steels have been used as wear resistant materials for nearly a hundred years. Along with the aggravation of energy problems and the deterioration of service conditions, a novel Fe-Mn-Al-C light high-manganese steel is developed in the 60 th century, and then the research on the aspects of casting process, forging process, alloying, heat treatment and the like of the Fe-Mn-Al-C light high-manganese steel is carried out. The heat treatment of Fe-Mn-Al-C light high manganese steel is also called water toughening treatment, which is to heat the light high manganese steel to a certain temperature (generally 800-1100 ℃), keep the temperature for a period of time and quench the light high manganese steel to room temperature to obtain a single austenite structure. And the aging treatment is to continuously heat the sample after the water toughening treatment to a certain temperature in a heat treatment furnace, and keep the temperature for a certain time. However, after the light high manganese steel is subjected to water toughness and aging treatment, carbide is coarse and unevenly distributed, and precipitation of carbide is not well controlled, and finally the prepared high manganese steel cannot meet the use requirements of actual production of modern equipment, so that the heat treatment process research is needed on the basis of the novel light high manganese steel.
Through searching, chinese patent application number: 201910839718.2, the invention is named: a heat treatment method for improving the mechanical properties of Fe-Mn-Al-C TRIP steel is disclosed, wherein the application discloses a heat treatment method for improving the mechanical properties of Fe-Mn-Al-C TRIP steel, a refined steel ingot is heated to 1200-1230 ℃, and the steel ingot is forged into a steel billet after heat preservation for 2-2.5 hours; then, the blank is rolled after being kept at 1200-1250 ℃ for 2-2.5 h, the initial rolling temperature is 1150-1200 ℃, and the final rolling temperature is 850-900 ℃; quenching at 650-750 deg.c, maintaining for 1-1.5 hr, and water quenching to room temperature; tempering at 200-220 deg.c and maintaining for 1-1.5 hr, and subsequent air cooling to room temperature. The application overcomes the defects of high heat treatment cost and complex process of TRIP steel in the prior art, and compared with critical heat treatment, bainite isothermal transformation and austenite reverse transformation, the method is simple to operate and more excellent than the conventional hot rolled TRIP steel in performance, but the application still has a space for further optimization in operation convenience.
Chinese patent application No.: CN201811512971.9 (a process for preparing a high manganese steel automobile gauge) provides a process for preparing a high manganese steel automobile gauge, wherein the sixth step adopts cryogenic treatment, adopts a liquid nitrogen gas method, and sprays liquid nitrogen to a die through a nozzle. The acting time of liquid nitrogen on the metal surface is 20-30 s. The method aims to eliminate unbalanced stress generated on the surfaces of the metal in the third, fourth and fifth pairs and improve the performance of the die. Many researchers have made a lot of work in this respect, improved the relevant technology of heat treatment, obtained more heat treatment experience, but all face the dilemma that comprehensive properties are poor, initial yield is low or only intensity is high, toughness is low, and heat treatment technological process is long, and the process technology is complicated (forging, rolling, quenching, tempering), production efficiency is low.
In summary, how to control the distribution and the size of carbides in the light high manganese steel casting tissue after the light high manganese steel casting is subjected to an effective heat treatment method, so as to obtain the high-strength and high-toughness light wear-resistant high manganese steel with good comprehensive performance, reduce the production cost and improve the production efficiency is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to:
in view of the problem that the prior art has poor comprehensive performance of the light high-manganese steel due to the distribution and the size of carbide in the light high-manganese steel casting structure, the invention aims to provide a heat treatment method for the high-strength and high-toughness light high-manganese steel casting in the wear-resistant field, wherein a single austenite structure is obtained by utilizing the combination of water toughness, deep cooling and aging treatment, the effective dispersed nano-scale carbide structure is obtained, and the grain refinement and solid solution strengthening effects of the high-strength and high-manganese steel are effectively improved. In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
a heat treatment method of a high-strength and high-toughness light wear-resistant high-manganese steel casting comprises the following steps:
s1, pretreatment: coating an anti-oxidation protective coating on the surface of the high manganese steel casting;
s2, water toughening treatment: heating the high manganese steel casting at a preset speed to reach a water toughness temperature of 1040-1200 ℃, preserving heat for 30-90 min, and then quenching;
s3, deep cooling treatment: cooling the high manganese steel casting after water toughening to the cryogenic treatment temperature, and preserving the temperature for 1-48 h;
s4, aging treatment: heating the high manganese steel casting subjected to the cryogenic treatment to an aging temperature, preserving heat for 30-240 min, and then air-cooling to room temperature, wherein the interval between the cryogenic treatment and the aging treatment is not more than 1h;
s5, shot blasting: and (5) performing shot blasting on the surface of the high manganese steel casting subjected to ageing treatment.
Preferably, the oxidation protective coating is Al 2 O 3 -SiO 2 -Na 2 O, each component is SiO according to mass percent 2 ：65～70％，Al 2 O 3 ：10～20％，ZrO 2 ：3～5％，B 2 O 3 ：1～5％，MgO：2～7％，CaO：2～4％，Na 2 O：4～9％，Other：3～10％。
Preferably, the oxidation protective coating is a high-temperature oxidation-resistant coating prepared on the surface of high-strength, high-toughness, light-weight and wear-resistant high-manganese steel by adopting a spraying method.
Preferably, the preset speed in S2 is not lower than 100 ℃/h.
Preferably, the temperature of the water toughness of the workpiece in S2 is 1050 ℃, and the heat preservation time is 1h.
Preferably, the cryogenic treatment temperature in S3 is-130 ℃ to-196 ℃.
Preferably, the cryogenic temperature of the workpiece in the step S3 is-196 ℃, the heat preservation time is 12 hours, the workpiece is quenched to room temperature by water, and the water temperature is not higher than 20 ℃.
Preferably, the ageing temperature in S4 is 450-650 ℃.
Preferably, the ageing temperature of the workpiece in S4 is 550 ℃, the heat preservation time is 1h, and then the workpiece is air-cooled to room temperature.
Preferably, the shot blasting is performed on the surface of the sample by using a pneumatic shot blasting machine; the main parameters of shot blasting are as follows: the air pressure is 0.18-0.5 MPa, the pellet material is cast steel 30, the pellet diameter is 0.2mm, the injection time is 2-60 min, and the injection angle is 85 degrees.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) The invention can obtain the Fe-Mn-Al-C light high manganese steel with the density range of 6.6g/cm 3 ～7.0g/cm 3 Compared with the traditional steel, the steel is reduced by 10 to 15 percent. The high-strength, high-toughness, light and wear-resistant high-manganese steel with the tensile strength of 700-850 MPa and the elongation of 45-55 percent can be obtained, and the high-strength, high-wear-resistant and high-manganese steel has better performance than a sample treated by a conventional heat treatment process and is expected to be an effective process for obtaining the high-strength, light and wear-resistant high-manganese steel.
(2) According to the heat treatment method of the high-strength and high-strength light wear-resistant high-manganese steel casting, the content of carbide in the treated steel body is obviously increased, and the distribution is obviously homogenized. The uniform distribution of nano carbide can obviously improve the comprehensive performance of Fe-Mn-Al-C light high manganese steel, thereby prolonging the service life of the material and having good application prospect.
(3) Compared with the conventional heat treatment mode of Fe-Mn-Al-C steel, the heat treatment method of the high-strength light wear-resistant high-manganese steel has the advantages that the strength and plastic product of the treated steel body is 33 Gpa-46 Gpa% which is far higher than the steel use requirement of 30Gpa% of an automobile, and the comprehensive performance is good.
(4) The coating in the invention can improve the surface quality of the light high manganese steel and prevent high temperature decarburization and oxidation.
(5) Compared with the heat treatment method for the high-strength and high-strength light wear-resistant high-manganese steel casting after rolling, the heat treatment method for the high-strength and high-strength light wear-resistant high-manganese steel casting is simple in operation process and easy to realize; the whole process consumes less time, and the solution aging is short-time treatment; thereby reducing the production cost, not damaging the sample, and having no pollution to the environment, and being a green treatment process.
(6) Compared with the conventional heat treatment (water toughening and aging), the heat treatment method of the high-strength light-weight wear-resistant high-manganese steel can remarkably improve the strength and still maintain higher plasticity, so that the high-strength light-weight high-manganese steel casting is obtained.
Drawings
FIG. 1 is a metallographic microstructure of a light wear-resistant high manganese steel of the present invention, wherein a) is the metallographic microstructure of an as-cast high strength and toughness light high manganese steel; b) The metallographic microstructure of the high-strength high-toughness light high-manganese steel which is subjected to heat treatment but not subjected to cryogenic cooling is adopted; and c) the metallographic microstructure of the high-strength high-toughness light high-manganese steel subjected to heat treatment and deep cooling treatment.
FIG. 2 is a stress-strain curve diagram of the light wear-resistant high manganese steel of the present invention. The stress strain curves without cryogenic treatment (marked as conventional water toughening treatment in the figure), and 1h, 12h and 48h of cryogenic treatment are contained in the figure.
Detailed Description
The invention is further described below with reference to examples.
Example 1
A heat treatment method of a high-strength and high-toughness light wear-resistant high-manganese steel casting comprises the following steps:
s1, pretreatment: coating an anti-oxidation protective coating on the surface of the high-strength high-toughness light wear-resistant high-manganese steel casting;
the high-strength and high-toughness light wear-resistant high-manganese steel is Fe-Mn-Al-C system or Fe-Mn-C system light high-manganese steel, the Fe-Mn-Al-C system is taken as an example for illustration in the embodiment, and the components of the light high-manganese steel are 22-32% of Mn by mass percent; 7-11% of Al; c1.0-1.5%, and the balance of Fe and unavoidable impurities.
Mn: is a main alloy element of high manganese steel and is also a main element for stabilizing austenite. Mn is easy to be dissolved in austenite, can enlarge a gamma-phase region and promotes the formation of a single austenite structure. When the carbon content is kept unchanged, the high manganese steel structure is changed from pearlite to martensite and then further converted to austenite along with the increase of the manganese content. If the manganese content is reduced, it is possible to reduce the austenite stability and toughness, but work hardening performance can be enhanced. And when the manganese content is too high, the heat conduction performance of the steel is reduced, and a crystal-penetrating structure is easy to form. Manganese can strongly promote the growth of austenite grains, coarsen the austenite grains, easily generate columnar crystals, and increase the condensation shrinkage of high manganese steel to form hot cracks.
C: can promote the formation of austenite structure, and if the content of C is too low, it is difficult to form single-phase austenite structure, and the work hardening capacity is insufficient. C can be dissolved in an austenite matrix to play a solid solution strengthening role, so that the hardness and strength of the high manganese steel can be increased, and the toughness and plasticity are reduced.
Al: the main purpose of the addition is to reduce the density, and only more than 7 percent of Al can reduce the density of the high manganese steel to 7g/cm 3 The following is to achieve the purpose of light weight. But too high Al content reduces the gamma phase region. Al is a ferrite stabilizing element, promotes the generation of ferrite structure, and reduces the work hardening capacity of high manganese steel; the activity of carbon is reduced, the solubility of carbon in austenite is improved, and the precipitation of carbide is reduced.
The oxidation protective coating is a high-temperature oxidation resistant coating prepared on the surface of high-strength high-toughness light wear-resistant high-manganese steel by adopting a spraying method. The oxidation protective coating is Al 2 O 3 -SiO 2 -Na 2 O, composition of SiO 2 (65wt％～70wt％)、Al 2 O 3 (10wt％～20wt％)、ZrO 2 (3wt％～5wt％)、B 2 O 3 (1wt％～5wt％)、MgO(2wt％～7wt％)、CaO(2wt％～4wt％)、Na 2 O (4 wt% -9 wt%) and Other (3 wt% -10 wt%). The coating adopts a slurry spraying method, takes widely distributed natural minerals and metallurgical solid wastes as main raw materials, and prepares the coating for heat treatment, which can be sprayed on the surface of a billet at room temperature to 700 ℃. The coating can improve the surface quality of the light high manganese steel and prevent high-temperature decarburization and oxidation. The coating sample surface coating automatically peels off from high temperature to room temperature, and almost no coating remains; and a layer of oxide which is extremely difficult to remove is adhered to the surface of the blank sample, and the carbon layer is formed by high-temperature decarburization.Other coating processes are complex, and raw materials are expensive, such as: the solution precursor-plasma spraying method comprises the steps of firstly preparing a precursor by adopting a chemical reagent, and then preparing a coating by using plasma spraying equipment; the spinel coating is prepared by adopting a glycine-nitrate method to burn and synthesize spinel raw materials; LSM and LSCF coatings are prepared from rare earth elements, co, sr and the like, and are deposited and coated in an aerosol box. The quantity, the size and the distribution of carbide in the steel after the anti-oxidation treatment are not controllable, the strengthening effect of the steel is unpredictable, the quality of finished steel cannot be ensured, the yield is reduced, the production efficiency is reduced, and the oxidation protective coating is necessary.
S2, water toughening treatment: heating the sample steel to the water toughness temperature of 1050 ℃ at a preset speed, preserving heat for 1h, quenching in water with the temperature not higher than 20 ℃, and quenching at the water temperature not higher than 50 ℃;
the preset speed is not lower than 100 ℃/h. The brittle carbide gradually dissolves into the austenite during the temperature increase. The higher heating rate provides a larger degree of superheat for the solid solution of the carbide, so that the carbide is completely solid-dissolved, thereby strengthening the cryogenic treatment, obtaining better effect and improving the strength and plasticity of the light high manganese steel.
S3, deep cooling treatment: cooling the water-toughened sample to a cryogenic treatment temperature of between 130 ℃ below zero and 196 ℃ below zero, and preserving heat for 1h; preferably the workpiece is cryogenically at-196 ℃. Soaking the sample steel obtained in the step S2 in nitrogen, and preserving the temperature for 1-48 h at the temperature of minus 130 ℃ to minus 196 ℃; it is generally believed that the cryogenic treatment affects the structure and properties of the workpiece more than the shallow treatment, and that the lower the temperature, the better the effect of the cryogenic treatment, so the cryogenic treatment is performed at-196 ℃. The precipitation of the fine carbide requires time, and the deep cooling treatment time is too long, so that the waste of resources and even the degradation of the material performance are caused; the total effect of the cryogenic treatment cannot be exerted due to insufficient cryogenic time.
S4, aging treatment: heating the sample subjected to the cryogenic treatment to 550 ℃ for heat preservation, wherein the heat preservation time is 1h, and then air cooling to room temperature (25 ℃) is carried out, and the interval between the cryogenic treatment and the aging treatment is not more than 1h; this is to retain dislocations formed during the cryogenic process and ensure the handling of the aged steel.
S5, shot blasting: and (5) performing shot blasting on the surface of the high manganese steel casting subjected to ageing treatment.
The shot blasting treatment adopts a pneumatic shot blasting machine to carry out shot blasting treatment on the surface of the sample; the main parameters of shot blasting are as follows: the air pressure is 0.18-0.5 MPa, the pellet material is cast steel 30, the pellet diameter is 0.2mm, the injection time is 2-60 min, and the injection angle is 85 degrees. The technology can be used for preparing the surface layer with the nanocrystalline structural characteristics on the surface of the light high-manganese steel, so that the surface hardness is improved, and the service time of the light high-manganese steel is prolonged.
FIG. 1 is a drawing of a metallographic microstructure of a light, wear-resistant high manganese steel before and after heat treatment, wherein FIG. a) is the metallographic microstructure of an as-cast high strength and toughness light, high manganese steel; b) The metallographic microstructure of the high-strength high-toughness light high-manganese steel which is subjected to heat treatment but not subjected to cryogenic cooling is adopted; and c) the metallographic microstructure of the high-strength high-toughness light high-manganese steel subjected to heat treatment and deep cooling treatment. From fig. a) it can be observed that the structure is a single austenitic structure, no carbides are observed; from the graph b), it can be observed that the structure is a single austenite structure, carbide is precipitated, but the quantity of carbide is small, the carbide is agglomerated together, the size is large, and the distribution is uneven; from figure c) it can be observed that the structure is likewise a single austenitic structure, but that many fine carbides are precipitated and that the grain size is significantly smaller than in the as-cast state. The fine dispersed carbide obtained by the process of the invention can inhibit the growth of crystal grains, and the fine austenite structure is obtained, so that the toughness of the steel is improved synergistically.
Fig. 2 is a graph of stress strain before and after heat treatment of a lightweight wear-resistant high manganese steel. The stress strain curves without cryogenic treatment (marked as conventional water toughening treatment in the figure), and 1h, 12h and 48h of cryogenic treatment are contained in the figure. From the figure, it can be seen that the strength of the sample subjected to the cryogenic treatment is improved, but the plasticity is slightly lowered. While the strength can be improved but the toughness is not reduced when the deep cooling treatment is carried out for 48 hours. This is due to the beneficial effect of the cryogenic treatment on the carbide morphology size distribution. The nano-scale tiny dispersed carbide greatly improves the comprehensive performance of the light high manganese steel.
According to national standard GB/T228.1-2010, a quasi-static uniaxial tensile test was performed at room temperature in an ETM105D electronic universal tester at a crosshead speed of 2.5mm/min, with each set of tensile data being an average of at least 3 tensile results. Finally, the density range of the Fe-Mn-Al-C light high manganese steel is 6.6g/cm 3 ～7.0g/cm 3 Compared with the conventional steel, the steel is reduced by 10 to 15 percent. The tensile strength is 750-850MPa, the elongation is 45-55%, and the strength-plastic product is 33 Gpa-46 Gpa%. The product of strength and elongation is a comprehensive performance index representing the strength and toughness level of a metal material, namely the static toughness (can be approximately represented by the product of strength and elongation after fracture (namely the elongation), the product is approximately equal to the area surrounded by a tensile curve of steel, the work of the steel when the sample is broken by absorbed energy or external force in the tensile test process is represented, and the calculation formula U is calculated T ＝σ b ×δ。
The steel used in the embodiment is Fe-25Mn-7Al-C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1h; deep cooling for 1h, aging at 550 ℃, and preserving heat for 1h; the steel for the conventional heat treatment process No. 1 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5 hours; aging at 500 ℃, and preserving heat for 3 hours; the steel for the conventional heat treatment process No. 2 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5h; aging at 600 ℃, and preserving heat for 3 hours. The steel for the conventional heat treatment process 3# is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5h; aging at 500 ℃, and preserving heat for 2 hours. The steel for the conventional heat treatment process No. 4 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5h; aging at 600 ℃, and preserving heat for 4 hours. The mechanical properties of the light high manganese steel in different states are shown in table 1.
TABLE 1 mechanical Properties of light high manganese Steel in different states
As can be seen from Table 1, the invention can effectively improve the mechanical properties of Fe-Mn-Al-C light high manganese steel, and greatly improves the yield, tensile strength and elongation. Compared with the conventional heat treatment 2# tensile strength, the heat treatment process of the invention has 28.7% improvement and 1000% improvement of elongation. The tensile strength and yield are reduced compared with the conventional heat treatment No. 1, but the elongation of No. 1 is only 8.4 percent. It can be seen from Table 1 that the strength-to-plasticity products of the present invention are superior to other conventional heat-treated samples. The heat treatment process can remarkably improve the strength, and meanwhile, still keep higher plasticity, so that the high-strength high-toughness light high-manganese steel casting is obtained.
Example two
The steel used in the embodiment is Fe-25Mn-7Al-C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1h; deep cooling for 12h, aging at 550 ℃, and preserving heat for 1h; the steel used in the example is Fe-25Mn-7Al-C, the temperature of the non-cryogenic treatment water is 1050 ℃, and the temperature is kept for 1h; deep cooling for 0h; aging is carried out at 550 ℃ for 1h, the interval between deep cooling and aging treatment is not more than 1h, and the optimal yield strength of 667Mpa is obtained in the embodiment. Tensile strength 798Mpa and elongation 45.5%. The steel for the conventional heat treatment process No. 1 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5 hours; aging at 450 ℃, and preserving heat for 1h. The steel for the conventional heat treatment process No. 2 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5h; aging at 450 ℃, and preserving heat for 4 hours. From Table 2, it can be seen that the strength-to-plastic product of this patent is superior to other conventional heat treated samples. The heat treatment process can remarkably improve the strength, and meanwhile, still keep higher plasticity, so that the high-strength high-toughness light high-manganese steel casting is obtained.
TABLE 2 mechanical Properties of light high manganese Steel in different states
Example III
The temperature of the water is 1050 ℃, and the temperature is kept for 1h; deep cooling for 48h; aging is carried out at 550 ℃ for 1h, the interval between deep cooling and aging treatment is not more than 1h, and the optimal elongation is 55 percent. Yield strength is 580Mpa, tensile strength is 779Mpa, and elongation is 55.0%. Yield strength is 580Mpa, tensile strength is 779Mpa, and elongation is 55.0%. The steel for the conventional heat treatment process No. 1 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5 hours; aging at 500 ℃, and preserving heat for 3 hours. The steel for the conventional heat treatment process No. 2 is Fe-32Mn-9Al-1.4C, the heat treatment process is that the water toughness temperature is 1050 ℃, and the heat preservation is carried out for 1.5h; aging at 500 ℃, and preserving heat for 4 hours. From Table 3, it can be seen that the strength-to-plastic product of this patent is superior to other conventional heat treated samples. The heat treatment process can remarkably improve the strength, and meanwhile, still keep higher plasticity, so that the high-strength high-toughness light high-manganese steel casting is obtained.
TABLE 3 mechanical properties of light high manganese steels in different states
Example IV
The temperature of the water is 950 ℃ and the temperature is kept for 1.5h; deep cooling for 1h; aging at 450 ℃, preserving heat for 1.5 hours, and keeping the interval between deep cooling and aging treatment not to exceed 1 hour. The yield strength is 642Mpa, the tensile strength is 789Mpa, and the elongation is 45.0%.
Claims (10)
1. A heat treatment method of a high-strength and high-toughness light wear-resistant high-manganese steel casting is characterized by comprising the following steps of: the method comprises the following steps:
s1, pretreatment: coating an anti-oxidation protective coating on the surface of the high manganese steel casting;
s2, water toughening treatment: heating the high manganese steel casting at a preset speed to reach a water toughness temperature of 1040-1200 ℃, preserving heat for 30-90 min, and then quenching;
s3, deep cooling treatment: cooling the high manganese steel casting after water toughening to the cryogenic treatment temperature, and preserving the temperature for 1-48 h;
s4, aging treatment: heating the high manganese steel casting subjected to the cryogenic treatment to an aging temperature, preserving heat for 30-240 min, and then air-cooling to room temperature, wherein the interval between the cryogenic treatment and the aging treatment is not more than 1h;
s5, shot blasting: and (5) performing shot blasting on the surface of the high manganese steel casting subjected to ageing treatment.
2. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of:
the oxidation protective coating is Al 2 O 3 -SiO 2 -Na 2 O, each component is SiO according to mass percent 2 ：65～70％，Al 2 O 3 ：10～20％，ZrO 2 ：3～5％，B 2 O 3 ：1～5％，MgO：2～7％，CaO：2～4％，Na 2 O：4～9％，Other：3～10％。
3. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: the oxidation protective coating is a high-temperature oxidation resistant coating prepared on the surface of high-strength high-toughness light wear-resistant high-manganese steel by adopting a spraying method.
4. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: and S2, the preset speed is not lower than 100 ℃/h.
5. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: s2, the temperature of the workpiece water toughness is 1050 ℃, and the heat preservation time is 1h.
6. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: and S3, the cryogenic treatment temperature is-130 ℃ to-196 ℃.
7. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: and S3, the cryogenic temperature of the workpiece is-196 ℃, the heat preservation time is 12h, the workpiece is quenched to room temperature by water, and the water temperature is not higher than 20 ℃.
8. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: the aging temperature in S4 is 450-650 ℃.
9. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: and S4, the ageing temperature of the workpiece is 550 ℃, the heat preservation time is 1h, and then the workpiece is air-cooled to room temperature.
10. The heat treatment method of the high-strength and high-toughness light wear-resistant high-manganese steel casting, which is characterized by comprising the following steps of: the shot blasting treatment adopts a pneumatic shot blasting machine to carry out shot blasting treatment on the surface of the sample; the main parameters of shot blasting are as follows: the air pressure is 0.18-0.5 MPa, the pellet material is cast steel 30, the pellet diameter is 0.2mm, the injection time is 2-60 min, and the injection angle is 85 degrees.
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| CN108707817A (en) * | 2018-05-02 | 2018-10-26 | 北京科技大学 | A kind of excavator bucket teeth and the excavator with the bucket tooth |
| CN114807772A (en) * | 2022-04-29 | 2022-07-29 | 燕山大学 | Aging-strengthened high-strength high-toughness light steel and manufacturing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107475527A (en) * | 2017-07-27 | 2017-12-15 | 洛阳双瑞特种装备有限公司 | A kind of high efficient thermoforming process of Mo austenitic stainless steels |
| CN108707817A (en) * | 2018-05-02 | 2018-10-26 | 北京科技大学 | A kind of excavator bucket teeth and the excavator with the bucket tooth |
| CN114807772A (en) * | 2022-04-29 | 2022-07-29 | 燕山大学 | Aging-strengthened high-strength high-toughness light steel and manufacturing method thereof |
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