Mechanical properties and strain hardening behavior of phase reversion-induced nano/ultrafine Fe-17Cr-6Ni austenitic structure steel
Mechanical properties and strain hardening behavior of phase reversion-induced nano/ultrafine Fe-17Cr-6Ni austenitic structure steel
复制标题
返相诱导纳米/超细Fe-17Cr-6Ni奥氏体结构钢的力学性能和应变硬化行为
DOI：
10.1016/j.jallcom.2016.08.020
复制
发表时间：
2016
影响因子：
6.2
通讯作者：
Misra R. D. K.
中科院分区：
文献类型：
--
作者：
Lei Chengshuai;Deng Xiangtao;Li Xiaolin;Wang Zhaodong;Wang Guodong;Misra R. D. K.
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 ∼220 nm was obtained and exhibited a good combination of high strength and high ductility when the cold reduction was ∼75% 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 ∼200 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.
