Microstructural developments and precipitate transformation during transient liquid-phase bonding of a duplex stainless steel

YUAN Xin-jian(袁新建)^1,2, KANG Chung-Yun²

(1. College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China;
2. Department of Materials Science and Engineering, Pusan National University, Busan 609735, Korea)

Abstract:Effect of holding time on microstructural developments and transformation of precipitates formed at the interface during transient liquid-phase bonding of a duplex stainless steel using a Ni-based amorphous insert alloy was studied. The experimental results reveal that the microstructure of the adjacent base metal varies clearly as a function of holding time. The migration of Cr and Ni elements and the d→g transformation seem to play relevant roles in this microstructure evolution. The scanning electron microscopy (SEM) and electron prob X-ray microanalysis (EPMA) results indicate the transformation of BN→BN and (N, Mo) boride→BN at the interface with the holding time of 60-1 800 s. N content changes with holding time increasing at locations at the interface might be a controlling factor contributing to this transformation.

Key words:transient liquid-phase bonding; duplex stainless steel; microstructural development; precipitate transformation