期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.02.101
关键词
Nanostructured materials; Austenite; Large strain cold rolling; Grain refinement; Phase transformation; Recrystallization
类别
资金
- Ministry of Education and Science, Russia [14.740.11.0333]
The microstructural evolution of an S304H steel during bar rolling to a strain of 4 and subsequent annealing as well as its effect on the mechanical properties were investigated. The cold working was accompanied by a strain-induced martensitic transformation, leading to the development of lamellar-type microstructure consisting of highly elongated austenite/ferrite subgrains with a mean transverse size of approximately 50 nm; the austenite volume fraction was approximately 0.35. This material exhibited a yield strength above 2000 MPa. The subsequent annealing resulted in grain coarsening following the ferrite -> austenite reversion, which led to almost full austenitization at temperatures above 700 degrees C. The formation of the austenite/ferrite lamellar structure that mixed with separate equiaxed grains occurred after annealing at temperatures of T <= 700 degrees C. The grain coarsening was accompanied by a degradation in strength, although the yield strength of above 1000 MPa remained after 2 h of annealing at 700 degrees C. The discontinuous recrystallization of austenite resulted in the development of a relatively coarse-grained microstructure at T >= 800 degrees C. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据