Microstructure Deformation Mechanism of Cobalt-Free Maraging Steel: In-Situ Synchronous X-Ray Diffraction Study

• DOI: 10.2139/ssrn.4112845
• Publication Date: 2022-05-28T12:18:10Z
• Authors: Daixiu Wei; Hu Li; Yong Liu; Weijiang Zhao; Bin Liu; Aki Tominaga; Takahisa Shobu
• Keywords: Maraging steel; Deformation mechanism

In this study, a cobalt-free Fe-18Ni-5Mo-2Cr-1.2Ti-0.6V maraging steel with dual-phase, which overcome the strength and ductility trade-off was investigated. This can be attributed to combination of nano-scaled precipitates within martensite lath stress-induced martensitic transformation. Micro-deformation behavior investigated by in-situ synchrotron X-ray diffraction. It found that density dislocation decreased sharply in alloy without precipitates, leading massive transformation, is, γ -austenite phase transformed α- phase. While, Ni 3 (Ti, Mo) could hinder movement, hence causing proliferation rapidly on loading. The interaction between dislocations resulted decrease stacking fault probability, hence, tuning transformation at high-stress levels. Our findings provide reference for better understanding micro-deformation mechanism are helpful development high-performance steels future.