Effect of Heat Treatment on Microstructure and Properties of SLM Formed CX Stainless Steel

CHEN Jinyi; CHEN Xinhao; MA Jingjing; ZHANG Kezhao; FENG Shi; YAN Chunyan; BAO Yefeng

doi:10.7512/j.issn.1001-2303.2024.03.05

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Effect of Heat Treatment on Microstructure and Properties of SLM Formed CX Stainless Steel
Vol. 54, Issue 3, Pages: 30-35(2024)
Published： 25 March 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.03.05

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陈锦伊，陈信豪，马晶晶，等.热处理对激光选区熔化制备CX不锈钢微观组织与性能的影响［J］.电焊机，2024，54（3）：30-35.

CHEN Jinyi, CHEN Xinhao, MA Jingjing, et al.Effect of Heat Treatment on Microstructure and Properties of SLM Formed CX Stainless Steel[J].Electric Welding Machine, 2024, 54(3): 30-35.
陈锦伊，陈信豪，马晶晶，等.热处理对激光选区熔化制备CX不锈钢微观组织与性能的影响［J］.电焊机，2024，54（3）：30-35. DOI： 10.7512/j.issn.1001-2303.2024.03.05.

CHEN Jinyi, CHEN Xinhao, MA Jingjing, et al.Effect of Heat Treatment on Microstructure and Properties of SLM Formed CX Stainless Steel[J].Electric Welding Machine, 2024, 54(3): 30-35. DOI： 10.7512/j.issn.1001-2303.2024.03.05.

摘要

采用激光选区熔化技术（SLM）制备了CX不锈钢（Corrax Stainless Steel），并对沉积态、固溶态、固溶时效态三种条件下的CX不锈钢进行显微组织分析和室温拉伸性能测试。结果表明，沉积态CX不锈钢的显微组织由99.4%马氏体和0.6%残余奥氏体组成，固溶处理后得到的组织为马氏体，在固溶处理的基础上进一步时效处理后，奥氏体的含量明显提高，同时伴随有NiAl金属间化合物析出。固溶时效处理显著提高了CX不锈钢的强度，可达1 426 MPa，因为NiAl相产生第二相强化效应，而逆转变奥氏体生成也改善了塑性。断口形貌分析显示三种热处理条件下CX不锈钢的断裂机制均为韧性断裂。

Abstract

CX stainless steel was prepared by selective laser melting(SLM)

and the microstructure and room temperature tensile properties of as-built

solution treated

and solution-aging treated samples were investigated. The results show that the microstructure of as-built CX stainless steel is composed of 99.4% martensite and 0.6% austenite. After the solution treatment

the microstructure is composed of full martensite

accompanied by the precipitation of NiAl intermetallic compounds. Further aging treatment on the basis of solution treatment significantly increased the content of austenite

The solution-aging treatment significantly improve the strength of CX stainless steel

reaching 1 426 MPa

due to the second-phase strengthening effect of the NiAl phase

while the formation of reversed austenite also improved plasticity. Fracture morphology analysis show that the fracture mechanism of CX stainless steel under the three heat treatment conditions was ductile fracture.

关键词

马氏体时效不锈钢激光选区熔化技术热处理显微组织拉伸性能

Keywords

maraging stainless steelselective laser meltingheat treatmentmicrostructuretensile property

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