文献类型：期刊文献

英文题名：Laser powder bed fusion of crack-susceptible stainless maraging steel undergoing solid-state phase transformations

作者：Sun, Zhongji[1];Sun, Binhan[2];Soh, Verner[1];Lee, Coryl[1];Lau, Desmond[1];Wei, Fengxia[1];da Silva, Alisson Kwiatkowski[3];Lin, Ming[1];Tan, Cheng Cheh[1];Wang, Pei[1];Ramamurty, Upadrasta[1,4]

机构：[1]Inst Mat Res & Engn IMRE, Agcy Sci Technol & Res ASTAR, 2 Fusionopolis Way,Innovis 08-03, Singapore City 138634, Singapore;[2]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]Max Planck Inst Eisenforschung, Microstruct Phys & Alloy Design, Dusseldorf, Germany;[4]Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore City, Singapore

年份：2024

卷号：263

外文期刊名：ACTA MATERIALIA

收录：;EI(收录号：20234815107104);WOS:【SCI-EXPANDED(收录号:WOS:001164624500001)】；

语种：英文

外文关键词：Hot cracking; Laser powder bed fusion; Stainless maraging steel; TiN particles

摘要：For alloys that experience solid-state phase transformation upon cooling, the absence of as-solidified chemical segregation information makes the elimination of hot cracking challenging. One such material is the hot-cracksusceptible high-strength maraging steel C465. Here, we resolve its hot cracking problem under the laser powder bed fusion process through the addition of titanium nitride (TiN) particles. During solidification, TiN promotes grain refinement and reduces the formation of liquid films with low solidus temperatures. Under cooling, the partial dissolution of TiN lowers the martensite start temperature and yields more retained austenite. Upon subsequent annealing, the dissolved titanium slows down the austenite reversion kinetics, while the dissolved nitrogen improves the yield strength. Materials under tensile deformation follow a three-stage work-hardening behavior, indicative of strain-induced martensitic transformations. This work highlights that besides the nucleant's grain refinement potency, the effect of its partial dissolution during processing needs to be critically examined, when addressing the hot cracking problem for alloys prone to phase transformations.