Influence of pre-strain on tensile deformation behavior of TRIP-assisted duplex stainless steel
HAO Shuo1, LI Zhi-guo1, ZHANG Xin1, SHE Jun-feng1, LIU Zhi-lei1, CHEN lei1,2
1. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, Hebei, China; 2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Qinhuangdao 066004, Hebei, China
Abstract：Pre-deformation, as a key pretreatment process for serving, is usually used to improve the mechanical properties of metal components. In order to clarify the effect of pre-strain on the mechanical behavior and transformation behavior, a series of quasi-static tensile tests were carried out on INSTRON 8801 to investigate the tensile deformation behavior of a TRIP-assisted duplex stainless steel(DSS) and its dependence on pre-strain. The micro-mechanism was discussed by means of TEM analysis, EBSD analysis and in-situ magnetic measurement. The results showed that a typical “three-stage” hardening characteristic of TRIP-assisted DSS was reflected due to the occurrence of strain-induced martensite transformation (SIMT) of γ→ε→α' during tensile deformation, therefore enhanced work hardening ability and mechanical properties were obtained. The introduction of pre-deformation (unloading) did not change the nucleation and growth mechanism of α' martensite, but influenced the work hardening behavior and the mechanical properties of test steel by changing the martensite transformation kinetics in the subsequent deformation process. With the increase of pre-strain level, the (subsequent) yield stress increased and the elongation A decreased gradually. However, different changing trends were revealed in ultimate tensile strength and total elongation At (At=εEpre +A) with increasing pre-strain level, which was closely related to the difference of martensitic transformation kinetics (i.e. transformation degree and transformation rate) under different deformation conditions.
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2022, Vol. 57 
