Mechanical properties and fracture characteristics of high carbon steel after equal channel angular pressing

被引：35
作者：
Xiong, Yi [1 ,2 ]
He, Tiantian [3 ]
Guo, Zhiqiang [1 ]
He, Hongyu [1 ]
Ren, Fengzhang [1 ,2 ]
Volinsky, Alex A. [4 ]
机构：
[1] Henan Univ Sci & Technol, Sch Mat Sci & Engn, Luoyang 471003, Peoples R China
[2] Henan Key Lab Adv Nonferrous Met, Luoyang 471003, Peoples R China
[3] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
[4] Univ S Florida, Dept Mech Engn, Tampa, FL 33620 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 563卷
基金：
中国国家自然科学基金;
关键词：
Ultra-microduplex structure; Equal channel angular pressing; Pearlitic; Mechanical properties; Fracture characteristics; GRAIN-REFINEMENT; PEARLITIC STEEL; MICROSTRUCTURE; DEFORMATION;
D O I：
10.1016/j.msea.2012.11.068
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The ultra-microduplex structure was fabricated in a fully pearlitic Fe-0.8 wt% C steel after equal channel angular pressing (ECAP) at 923 K via the Bc route. The microstructures and mechanical properties, before and after deformation, were investigated using scanning electron microscopy and mini-tensile tests. The cementite lamellae are gradually spheroidized by increasing the number of ECAP passes. After four passes, the cementite lamellae are fully spheroidized. Microhardness and the ultimate tensile strength of pearlite increase with the strain, up to a peak value (after two passes) and then decrease significantly. The yield strength, elongation and percentage of reduction in area increase with the number of ECAP passes. The tensile fracture morphology changes gradually from brittle cleavage to typical ductile fracture after four passes. (c) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：163 / 167
页数：5
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