Effect of annealing temperature on nano/ultrafine grain of Ni-free austenitic stainless steel

被引：37
作者：
Behjati, P. [1 ]
Kermanpur, A. [1 ]
Najafizadeh, A. [1 ]
Baghbadorani, H. Samaei [1 ]
机构：
[1] Isfahan Univ Technol, Dept Mat Engn, Esfahan 8415683111, Iran
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 592卷
关键词：
Austenitic stainless steel; Nano/ultrafine grained microstructure; Thermomechanical processing; Martensitic transformation; Precipitation; DEFORMATION-INDUCED MARTENSITE; MECHANICAL-PROPERTIES; STRAIN-RATE; REVERSION; SIZE; TRANSFORMATION; BEHAVIOR; STABILITY; DUCTILITY; MICROSTRUCTURE;
D O I：
10.1016/j.msea.2013.10.087
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In the present work, martensite thermomechanical treatment was employed to refine the microstructure of a metastable Ni-free austenitic stainless steel down to nano/ultrafine size. For this purpose, the studied alloy was cold rolled to about 80% reduction followed by reversion annealing at 973 K (700 degrees C)-1273 K (1000 degrees C) for 1-10(4) s. It was observed that the finest austenitic microstructure is achieved in the sample reversion annealed at 1173 K (900 degrees C) for 100 s. It had a bimodal microstructure composed of nano and ultrafine grains with an average grain size of about 240 +/- 117 nm. Also, formation of nano-size (Cr,Fe, Mn)-rich carbonitrides was observed in the microstructure of this sample. The reversion mechanism was determined to be shear-type. The nano/ultrafine grained sample exhibited an ultrahigh strength (yield strength of 1150 MPa and tensile strength of 1293 MPa) and a good elongation of 21%. It was shown that grain refining down to nano/ultrafine range promotes deformation-induced martensitic transformation, which can improve the ductility of the alloy. (C) 2013 Elsevier B.V. All rights reserved.
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收藏
页码：77 / 82
页数：6
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