Warm ductility enhanced by austenite reversion in ultrafine-grained duplex steel

被引：30
作者：
Cheng, Guan-Ju [1 ]
Gault, Baptiste [2 ]
Huang, Cheng-Yao [1 ]
Huang, Ching-Yuan [3 ]
Yen, Hung-Wei [1 ]
机构：
[1] Natl Taiwan Univ, Dept Mat Sci & Engn, Roosevelt Rd, Taipei, Taiwan
[2] Max Planck Inst Eisenforsch GmbH, Dept Microstruct Phys & Alloy Design, Dusseldorf, Germany
[3] China Steel Corp, Iron & Steel R&D Dept, Chung Kong Rd, Kaohsiung, Taiwan
来源：
ACTA MATERIALIA | 2018年 / 148卷
关键词：
Warm ductility; Austenite reversion; Ultrafine grain; Steel; Transformation; TENSILE DEFORMATION-BEHAVIOR; HOT DUCTILITY; DYNAMIC RECRYSTALLIZATION; STAINLESS-STEEL; INDUCED FERRITE; STRENGTH STEEL; SUPERPLASTICITY; ALLOY; MARTENSITE; MECHANISMS;
D O I：
10.1016/j.actamat.2018.01.060
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The current work investigated the relationship between microstructure and warm deformation properties in a strong but ductile Mn-rich steel. A cold -rolled Fe-11.3Mn-0.068C-0.3Si-1.1Al-0.25Mo-0.01P-0.01S-0.0003N (in wt. %) steel was deformed isothermally after inter-critical annealing at temperatures from 550 degrees C to 720 degrees C. Deformation at 650 degrees C led to exceptional ductility, corresponding to total elongation of over 100%. The microstructure was characterized by electron backscattered diffraction, transmission Kikuchi diffraction, and transmission electron microscopy. It was found that the rate of austenite reversion can be accelerated by deformation, and that the transformation makes strained austenite into equiaxed grains. Exceptional ductility can be achieved when warm deformation is accompanied by austenite reversion. This research will provide metallurgical principles for warm deformation of steel under reversed transformation. (c) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：344 / 354
页数：11
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