Deformation behavior of a high-plasticity nano/ultrafine-grained N-bearing duplex stainless steel: Twin/twin-like induced plasticity effect

被引：10
|
作者：
Moallemi, Mohammad [1 ,2 ]
Zarei-Hanzaki, Abbas [1 ]
Kim, Sung-Joon [2 ]
Hong, Changwan [2 ]
Nezhadfar, Pooriya Dastranjy [1 ]
机构：
[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, Complex Lab Hot Deformat & Thermomech Proc High P, Tehran, Iran
[2] Pohang Univ Sci & Technol, Grad Inst Ferrous Technol, Pohang, South Korea
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 700卷
关键词：
Nano/ultrafine-grained structure; Duplex stainless steels; planar defect; Twin/twin-like induced plasticity; Strain induced martensite; MECHANICAL-PROPERTIES; MICROSTRUCTURE; TRANSFORMATION;
D O I：
10.1016/j.msea.2017.06.040
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The present study deals with the grain refinement of a high nitrogen duplex stainless steel through cold rolling up to 80% and subsequent reversion annealing in the range of 750 degrees C to 1100 degrees C at various duration times. The microstructural observations showed that the nano/ultrafine-grained (NG/UFG) austenite with the grain size of 400 nm was obtained by annealing at 900 degrees C for 30 s due to alpha-martensite to austenite complete reverse transformation. The NG/UFG duplex steel indicated a superior mechanical properties consist of 1 GPa yield strength (YS) and 40% elongation to fracture. The transmission electron microscopy study of the tensile deformed NG/UFG material indicated that the nature of extraordinary plasticity in NG/UFG material is because of the dense planar defects, specifically, the twin/twin-like induced plasticity effect in austenite, accompanied with strain accommodation of coarse grain ferrite phase.
引用
收藏
页码：637 / 640
页数：4
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