材料期刊网

Influence of PreTransformed Martensite on WorkHardening Behavior of SUS 304 Metastable Austenitic Stainless Steel

XUE Zong-yu , ZHOU Sheng

钢铁研究学报(英文版)

The metastable austenite was transformed to martensite by prestrain tension of SUS304 stainless steel to study the influence of transformed martensite on its subsequent workhardening behavior under the uniaxial tensile condition. The Xray diffractometer (XRD) was employed to detect the transformed martensite. Results showed that the volume fraction of transformed martensite increases with increasing prestrain. The pretransformed martensite in the microstructure remarkably affects the deformation behavior of the steel, and the strength increases and the elongation decreases. The workhardening curve of prestrained specimens observably changes with true strain. The workhardening exponent n of stainless steel decreases with the increase of pretransformed martensite. The achievement is a significant contribution to the process design during pressing.

关键词: Prestrain;SUS304 stainless steel;Martensite;Work-hardening