Homogenization on solution treatment and its effects on the precipitation-hardening of selective laser melted 17-4PH stainless steel  

作　　者：Sohee An Du-Rim Eo Il Sohn Kyunsuk Choi 

机构地区：[1]Department of Materials Science and Engineering,Yonsei University,Seoul,03722,Republic of Korea [2]Advanced Joining&Additive Manufacturing R&D Department,Korea Institute of Industrial Technology(KITECH),529 Seohaean-ro,Siheung 15014,Republic of Korea [3]Department of Industry-University Convergence,Hanbat National University,Yuseong,Daejeon,34158,Republic of Korea

出　　处：《Journal of Materials Science & Technology》2023年第35期47-57,共11页材料科学技术（英文版）

基　　金：This work was funded by Yangyoung Foundation and supported by the Technology Innovation Program(grant No.20009815,Development of DfAM-based 3D printing technology for lightweight and integrated aerospace parts)funded by the Ministry of Trade,Industry&Energy(MOTIE,Korea).

摘　　要：17-4 precipitation-hardened(PH)stainless steel(SS)exhibits high strength and good corrosion resistance via Cu-precipitation hardening.Unlike conventional wrought 17-4PH SS,Cu segregation andε-Cu pre-cipitates are observed in additively manufactured(AM)17-4PH SS owing to the repeated rapid cooling after heating,which characterizes the AM process.In this study,solution treatment was conducted under various temperatures(1,000,1,050,1,100,and 1,200℃)and durations(1,2,4,and 8 h)to minimize the negative effects of Cu segregation andε-Cu precipitates on precipitation hardening.The mechanical prop-erties and microstructures of each condition for the Cu precipitation behavior were examined.Although theε-Cu precipitates did not disappear after solution treatment,the average diameter of theε-Cu precipi-tates tended to decrease with increasing solution treatment temperature and duration.Therefore,solution treatment at a temperature of 1,200℃ for 8 h was the best,resulting in improved strength compared to the conventional solution treatment at 1,050℃.Solution treatment on at least 1,100℃ is effective in AM.

关 键 词：Selective laser melting Cu segregation Solution treatment 17-4 Precipitation-hardened stainless steel Additive manufacturing 

分 类 号：TG456.7[金属学及工艺—焊接]