CN110681854A - 316L stainless steel powder metallurgy part enhanced by enhancement body - Google Patents
316L stainless steel powder metallurgy part enhanced by enhancement body Download PDFInfo
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- CN110681854A CN110681854A CN201810734785.3A CN201810734785A CN110681854A CN 110681854 A CN110681854 A CN 110681854A CN 201810734785 A CN201810734785 A CN 201810734785A CN 110681854 A CN110681854 A CN 110681854A
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 74
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 74
- 238000004663 powder metallurgy Methods 0.000 title claims abstract description 34
- 239000000843 powder Substances 0.000 claims abstract description 37
- 230000002787 reinforcement Effects 0.000 claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005245 sintering Methods 0.000 claims abstract description 23
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 17
- 238000005260 corrosion Methods 0.000 claims abstract description 16
- 230000007797 corrosion Effects 0.000 claims abstract description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000005469 granulation Methods 0.000 claims abstract description 4
- 230000003179 granulation Effects 0.000 claims abstract description 4
- 239000012466 permeate Substances 0.000 claims abstract description 3
- 239000011159 matrix material Substances 0.000 claims description 16
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 4
- 230000001737 promoting effect Effects 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000013401 experimental design Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000001238 wet grinding Methods 0.000 claims description 3
- 230000002349 favourable effect Effects 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims 1
- 238000000498 ball milling Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005452 bending Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000280 densification Methods 0.000 abstract description 2
- 238000001035 drying Methods 0.000 abstract description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 abstract 2
- 238000009689 gas atomisation Methods 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241001280173 Crassula muscosa Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910005091 Si3N Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000002557 mineral fiber Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- B22F1/0003—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
In order to improve the hardness and the wear resistance of the powder metallurgy part, a reinforcement body reinforced 316L stainless steel powder metallurgy part is designed. 316L gas atomization of stainless steel powder, WC powder, TiC powder, NbC powder and Al2O3Powder of Si3N4The powder is used as a raw material, and the enhanced 316L stainless steel powder metallurgy part with excellent mechanical property is successfully prepared through the processes of material preparation, ball milling, drying, granulation, forming, ball milling, pressing and sintering. The developed reinforcement body reinforced 316L stainless steel powder metallurgy part can effectively improve the strength of the stainless steel, shows excellent corrosion resistance, and is beneficial to forming high-strength high-nitrogen steel because nitrogen uniformly permeates into the stainless steel. The hardness, the densification degree and the bending strength of the prepared reinforcement-enhanced 316L stainless steel powder metallurgy part are greatly improved. The invention can provide high-performance 316L stainless steel powder metallurgy partsA new production process.
Description
Technical Field
The invention relates to a powder metallurgy material, in particular to a preparation method of a reinforcement-enhanced 316L stainless steel powder metallurgy part.
Background
The reinforcement is the load bearing component of the composite material. The reinforcing body is divided into particles with zero dimension, fibers with one dimension, sheets with two dimensions and three-dimensional structures according to the geometric shape. Inorganic reinforcements and organic reinforcements are classified by their properties, and of these, synthetic and natural reinforcements are included. The main reinforcement is fibrous, such as inorganic glass fiber, carbon fiber, and a small amount of ceramic fiber such as silicon carbide, and the organic is aramid fiber. Two-dimensional cloth and felt are also commonly used reinforcements, with glass, carbon, and aramid among others. Three-dimensional profiled fabrics are being developed which are suitable for the needs of various composite profiles and monoliths. Natural plant and mineral fibers, sheets and particles are also used as reinforcement, but are only suitable for low performance composites. High performance reinforcement, while not yielding much, is already very high in performance.
316L stainless steel is commonly used for pulp and paper equipment heat exchangers, dyeing equipment, film processing equipment, pipelines, materials for exterior buildings in coastal areas, and watch chains, watch cases, etc. of high-grade watches. Equipment, chemical, dye, paper making, oxalic acid, fertilizer and other production equipment are used in seawater; photo, food industry, coastal installations, ropes, CD bars, bolts, nuts. Strength and corrosion resistance are two important properties of powder metallurgical stainless steel. Compared with forged stainless steel, unmodified sintered stainless steel has inferior properties in strength, corrosion resistance, abrasion resistance, etc.
Disclosure of Invention
The invention aims to improve the hardness and the wear resistance of a powder metallurgy part and designs a reinforcing body reinforced 316L stainless steel powder metallurgy part.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the preparation raw materials of the reinforcement-enhanced 316L stainless steel powder metallurgy part comprise: 316L gas atomized stainless steel powder, WC powder, TiC powder, NbC powder, Al2O3Powder of Si3N4And (3) powder.
The preparation method of the reinforcement-enhanced 316L stainless steel powder metallurgy part comprises the following steps: weighing and proportioning the original powder according to an experimental design scheme, and pouring the weighed and proportioned powder into a ball mill for wet grinding. After the ball milling is finished, the prepared granules are dried in vacuum, and then a forming agent is added for granulation. And adding the prepared powder into a universal testing machine for unidirectional pressing, wherein the pressing pressure is 1000 MPa. And then placing the mixture into a vacuum sintering furnace for sintering, wherein the sintering temperature is 1200 ℃, and the heat preservation time is 90 min.
The detection steps of the reinforcement-enhanced 316L stainless steel powder metallurgy part are as follows: the height and the diameter of a sample are measured by a micrometer, the MASs of the sample is measured by an electronic analysis balance, the hardness is measured by a bloovind hardness tester, an MAS00 granularity analyzer is adopted for granularity analysis, a TAL1000 surface profile instrument is adopted for surface roughness, a Leica metallographic microscope is adopted for observation of a microscopic structure, a DH100 type microvisc hardness tester is adopted for hardness test, the tensile property is tested on a CM510 type universal testing machine, the fracture appearance is observed by a scanning electron microscope, and a D8 type X-ray diffractometer is adopted for phase analysis.
The reinforcing body reinforced 316L stainless steel powder metallurgy part has good compatibility of TiC, WC, NbC and a stainless steel matrix, can be uniformly distributed in the stainless steel matrix, can effectively improve the strength of the stainless steel, and the stainless steel composite material added with the TiC also shows excellent corrosion resistance.
The reinforcement-enhanced 316L stainless steel powder metallurgy part has poor compatibility of Al2O3 and a stainless steel matrix, so that Al2O3 cannot play a role of a reinforcement, and the stainless steel added with Al2O3 has poor strength and corrosion resistance.
According to the reinforcement reinforced 316L stainless steel powder metallurgy part, the 316L stainless steel added with Si3N4 is decomposed in the sintering process of Si3N4, a matrix is dispersion-strengthened, silicon has the function of promoting sintering, nitrogen uniformly permeates into the stainless steel, and high-strength high-nitrogen steel is favorably formed, so that the relative density, hardness and corrosion resistance of a sample are higher than those of other samples.
The invention has the beneficial effects that:
316L gas atomized stainless steel powder is used as a raw material, and the enhanced 316L stainless steel powder metallurgy part with excellent mechanical property is successfully prepared through the processes of material mixing, ball milling, drying, granulating, forming and ball milling. The developed reinforcement-enhanced 316L stainless steel powder metallurgy part has good compatibility with a stainless steel matrix, can be uniformly distributed in the stainless steel matrix, can effectively improve the strength of the stainless steel, and also shows excellent corrosion resistance. The hardness, the densification degree and the bending strength of the prepared reinforcement-enhanced 316L stainless steel powder metallurgy part are greatly improved. The invention can provide a new production process for preparing high-performance reinforcement 316L stainless steel powder metallurgy parts.
Detailed Description
Example 1:
the preparation raw materials of the reinforcement-enhanced 316L stainless steel powder metallurgy part comprise: 316L gas atomized stainless steel powder, WC powder, TiC powder, NbC powder, Al2O3 powder, Si3N4 powder. The preparation method of the reinforcement-enhanced 316L stainless steel powder metallurgy part comprises the following steps: weighing and proportioning the original powder according to an experimental design scheme, and pouring the weighed and proportioned powder into a ball mill for wet grinding. After the ball milling is finished, the prepared granules are dried in vacuum, and then a forming agent is added for granulation. And adding the prepared powder into a universal testing machine for unidirectional pressing, wherein the pressing pressure is 1000 MPa. And then placing the mixture into a vacuum sintering furnace for sintering, wherein the sintering temperature is 1200 ℃, and the heat preservation time is 90 min. The detection steps of the reinforcement-enhanced 316L stainless steel powder metallurgy part are as follows: the height and the diameter of a sample are measured by a micrometer, the MASs of the sample is measured by an electronic analysis balance, the hardness is measured by a bloovind hardness tester, an MAS00 granularity analyzer is adopted for granularity analysis, a TAL1000 surface profile instrument is adopted for surface roughness, a Leica metallographic microscope is adopted for observation of a microscopic structure, a DH100 type microvisc hardness tester is adopted for hardness test, the tensile property is tested on a CM510 type universal testing machine, the fracture appearance is observed by a scanning electron microscope, and a D8 type X-ray diffractometer is adopted for phase analysis.
Example 2:
after the materials with different reinforcements are added, the relative density is obviously improved compared with that before sintering, the improvement degree is obviously larger than that of pure stainless steel, and particularly, the relative density is improved by 12.7 percent by adding Si3N 4; this is further demonstrated in the following analysis due to some reaction with the stainless steel matrix during sintering. The samples with the addition of a12O3 had low relative densities before and after sintering, on the one hand due to the lower density resulting in a lower composite density and on the other hand due to the poor reactivity of the particles with the stainless steel particles, which hampered the sintering process. This low reactivity is common with oxide addition.
Example 3:
the hardness of the material after adding TIC, WC, NbC, A12O3 and Si3N4 was 90.0, 73.5, 56.0, 16.0 and 98HBR, respectively, while the hardness after sintering 316L was 49 HRB. Therefore, the hardness of the samples added with TIC and WC is higher, the TIC and WC are important raw materials for producing hard alloy, particularly steel bonded hard alloy, the hardness of the composite material sample is improved, and the hardness of the powdered stainless steel can be improved by adding a small amount of the powder; si3N4 and A12O3 belong to ceramic materials, and the hardness of samples of the two ceramic materials is greatly different, which is very likely that Si3N4 is decomposed into nitrogen and silicon in the high-temperature vacuum sintering process, the nitrogen is uniformly diffused into a stainless steel matrix to form the dispersion strengthening of nitride, the silicon also has the function of promoting sintering, and the Al2O3 has poor reactivity with the matrix.
Example 4:
the distribution of nitrogen does not change much from the inside of one grain to the inside of the adjacent grain, while the content of silicon at the grain boundary increases and the content of stainless steel at the grain boundary is small, which proves that the decomposition of Si3N4 does occur during the sintering process. Nitrogen is uniformly diffused into the stainless steel matrix, and dispersion strengthening of nitride occurs, which is very advantageous for forming high nitrogen steel. In addition, silicon also has an effect of promoting sintering. Nitrogen is an important alloy element with application prospect in stainless steel, and from the current research situation of nitrogen-containing stainless steel, the nitrogen can improve the performance of the steel through three ways of solid solution strengthening, nitride dispersion strengthening and grain refinement. After a silicon nitride reinforcement is added into a stainless steel matrix, two reaction mechanisms occur, namely a substitution mechanism reaction of chromium diffusing to silicon nitride phase; the other is diffusion of nitrogen in the silicon nitride into the matrix to cause dispersion strengthening. The texture surface of the silicon nitride composite sample was quite dense, indicating that the two mechanisms have excellent complementarity. The sintered 316L stainless steel coupon has smaller pores on its surface, and the presence of these pores can reduce the strength, corrosion and wear resistance of the sintered stainless steel.
Example 5:
the surface of the sample added with TiC and Si3N4 hardly sees an etching pit and is very dense; the surface of the sample added with WC has a very small amount of tiny corrosion pits; the surface corrosion pits of the sample added with NbC and Al2O3 are obviously increased, and particularly the surface of the sample added with Al2O3 has the sign of oxidation; although the pure 316L stainless steel sample has certain glossiness, a plurality of concave points appear on the surface, and the corrosion phenomenon is most obvious. These phenomena indicate that TIC and Si3N4 are more favorable for enhancing the corrosion resistance of the sample, while NbC and Al2O3 do not contribute much to the corrosion resistance.
Claims (4)
1. The preparation raw materials of the reinforcement-enhanced 316L stainless steel powder metallurgy part comprise: 316L gas atomized stainless steel powder, WC powder, TiC powder, NbC powder, Al2O3Powder of Si3N4And (3) powder.
2. The reinforcement-enhanced 316L stainless steel powder metallurgy part of claim 1, wherein the reinforcement-enhanced 316L stainless steel powder metallurgy part is prepared by the steps of: weighing and proportioning original powder according to an experimental design scheme, pouring the weighed and proportioned powder into a ball mill for wet milling, after the ball mill is finished, carrying out vacuum drying on the prepared granules, then adding a forming agent for granulation, adding the prepared powder into a universal testing machine for one-way pressing, wherein the pressing pressure is 1000MPa, then putting the powder into a vacuum sintering furnace for sintering, the sintering temperature is 1200 ℃, and the heat preservation time is 90 min.
3. The reinforcement-enhanced 316L stainless steel powder metallurgy part of claim 1, wherein the step of testing the reinforcement-enhanced 316L stainless steel powder metallurgy part comprises: the height and the diameter of a sample are measured by a micrometer, the MASs of the sample is measured by an electronic analysis balance, the hardness is measured by a bloovind hardness tester, an MAS00 granularity analyzer is adopted for granularity analysis, a TAL1000 surface profile instrument is adopted for surface roughness, a Leica metallographic microscope is adopted for observation of a microscopic structure, a DH100 type microvisc hardness tester is adopted for hardness test, the tensile property is tested on a CM510 type universal testing machine, the fracture appearance is observed by a scanning electron microscope, and a D8 type X-ray diffractometer is adopted for phase analysis.
4. The reinforcement-reinforced 316L stainless steel powder metallurgy part according to claim 1, wherein the reinforcement-reinforced 316L stainless steel powder metallurgy part, TiC, WC, NbC, has good compatibility with the stainless steel matrix, can be uniformly distributed in the stainless steel matrix, can effectively improve the strength of the stainless steel, and the stainless steel composite material added with TiC also exhibits excellent corrosion resistance, the reinforcement-reinforced 316L stainless steel powder metallurgy part, because Al2O3 has too poor compatibility with the stainless steel matrix, Al2O3 cannot play the role of reinforcement, resulting in poor strength and corrosion resistance of the stainless steel added with Al2O3, the reinforcement-reinforced 316L stainless steel powder metallurgy part, the 316L stainless steel added with Si3N4 decomposes in the sintering process, Si3N4 disperses and strengthens the matrix, silicon has the function of promoting sintering, and nitrogen uniformly permeates into the stainless steel, the method is favorable for forming high-strength high-nitrogen steel, so that the relative density, hardness and corrosion resistance of the sample are higher than those of other samples.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810734785.3A CN110681854A (en) | 2018-07-06 | 2018-07-06 | 316L stainless steel powder metallurgy part enhanced by enhancement body |
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| CN201810734785.3A CN110681854A (en) | 2018-07-06 | 2018-07-06 | 316L stainless steel powder metallurgy part enhanced by enhancement body |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111790917A (en) * | 2020-07-02 | 2020-10-20 | 西安建筑科技大学 | Iron-based composite workpiece with high hardness and high wear resistance and preparation method thereof |
| CN112122607A (en) * | 2020-10-10 | 2020-12-25 | 哈尔滨工程大学 | Additive repair material suitable for marine oscillation working condition and molten pool stability-shape regulation and control method |
| CN113500196A (en) * | 2021-07-14 | 2021-10-15 | 燕山大学 | Method for improving high-temperature oxidation resistance of austenitic stainless steel by regulating and controlling nano-network distribution of Si |
| CN113798498A (en) * | 2020-12-31 | 2021-12-17 | 昆山卡德姆新材料科技有限公司 | Stainless steel product and preparation method thereof |
-
2018
- 2018-07-06 CN CN201810734785.3A patent/CN110681854A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111790917A (en) * | 2020-07-02 | 2020-10-20 | 西安建筑科技大学 | Iron-based composite workpiece with high hardness and high wear resistance and preparation method thereof |
| CN112122607A (en) * | 2020-10-10 | 2020-12-25 | 哈尔滨工程大学 | Additive repair material suitable for marine oscillation working condition and molten pool stability-shape regulation and control method |
| CN113798498A (en) * | 2020-12-31 | 2021-12-17 | 昆山卡德姆新材料科技有限公司 | Stainless steel product and preparation method thereof |
| CN113500196A (en) * | 2021-07-14 | 2021-10-15 | 燕山大学 | Method for improving high-temperature oxidation resistance of austenitic stainless steel by regulating and controlling nano-network distribution of Si |
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Application publication date: 20200114 |