Effect of low cold-rolling strain on microstructure, texture, phase transformation, and mechanical properties of 2304 lean duplex stainless steel

摘要

The effect of cold rolling deformation (4%-22%) on the microstructure, microtexture, and mechanical properties of a 2304 lean duplex stainless steel was investigated. The deformed microstructures were analyzed by electron backscattering diffraction and transmission electron microscopy. The results showed that after 4% thickness reduction, the strain produced phase transformation in austenite (gamma), stacking faults (SFs), and mechanical twins. The orientation relationships of Kurdjumov-Sachs (K-S) and Nishiyama-Wassermann (N-W) were observed between the gamma and alpha'-martensite. Moreover, Shoji-Nishiyama (S-N) and Pitsch-Schrader (P-S) were observed between gamma and epsilon-martensite, and epsilon-martensite and alpha'-martensite, respectively. A further reduction in thickness (up to 22%) caused a reduction in total elongation and an increase in the yield and the ultimate tensile strength.