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Effect of heat treatment on microstructure and mechanical properties of selective laser-melted PH13-8Mo stainless steel

作     者:Yuan Zhang Xiang Liu Chang-jun Wang Chang Liu Yuan Zhang;Xiang Liu;Chang-jun Wang;Chang Liu

作者机构:School of Material Science and EngineeringKunming University of Science and TechnologyKunming 650093YunnanChina Central Iron&Steel Research Institute Co.Ltd.Beijing 100081China 

出 版 物:《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期:2024年第31卷第4期

页      面:945-955页

核心收录:

学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 

基  金:supported by the National Key Research&Development Program of China(No.2021YFB3702501) the Innovation Fund of China Steel Research Technology Group Co.,Ltd.(No.KNJT05-JTOM-21001) 

主  题:High-strength stainless steel-Selective laser melting-Heat treatment Microstructure Mechanical property 

摘      要:PH13-8Mo stainless steel powder with high sphericity and well fluidity was prepared by the plasma rotating electrode *** formed parts with ultra-high purity were manufactured by selective laser *** tensile and impact mechanical properties of the printed parts under three heat treatment regimes were compared to those without heat *** microstructure,grain orientation and phase composition were characterized by electron-backscatter diffraction,X-ray diffraction and transmission electron *** characterization results reveal that the addition of heat treatment makes the grains enlarge,and after different heat treatments,the average grain size from 1.51μm in the printed state increases to 2.78,3.09 and 2.06μm,*** formed parts are mainly composed of martensite and retained ***,the NiAl and M23C precipitates form,which are the major strengthening phases of PH13-8Mo stainless *** optimal heat treatment process is 925℃×1 h water cooling(WC)+0℃×2 h air cooling(AC)+540℃×4 h *** this heat treatment process,PH13-8Mo formed parts have the optimal comprehensive mechanical properties:the tensile strength,yield strength and impact energy KU2 are 1492 MPa,1432 MPa and 63 J,*** strengthening and toughening via heat treatment are mainly attributed to dislocation strengthening,the formation of NiAl and M23Co precipitates and the change of volume fraction of the retained austenite.

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