Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1605192 | Journal of Alloys and Compounds | 2016 | 8 Pages |
Abstract
Nano/ultrafine-grained (Nano/UFG) structure was obtained in Fe-17Cr-6Ni austenitic steel using a combination of severe cold deformation and reverse-transformation annealing. The microstructural evolution during severe cold reduction and annealing was studied to elucidate the effect of grain size on mechanical properties and strain hardening behavior. Austenitic steel with the smallest average grain size of â¼220 nm was obtained and exhibited a good combination of high strength and high ductility when the cold reduction was â¼75% and annealing was carried out at 700 °C for 20 s. The relationship between grain size and yield strength was in good agreement with Hall-Petch relationship until â¼200 nm grain size. For coarse-grained steel, the strain hardening rate (SHR) plots comprised of 4 stages and the increase of SHR was attributed to deformation-induced martensite transformation (DIMT). While for Nano/UFG ASS, the SHR plots contained only 3 stages and the increase of SHR was attributed to the comprehensive effect of DIMT and twining.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Chengshuai Lei, Xiangtao Deng, Xiaolin Li, Zhaodong Wang, Guodong Wang, R.D.K. Misra,