Optimization of Strength and Ductility in Ultra-Fine 304 Stainless Steel after Equal-Channel Angular Processing

被引：12
作者：
Zheng, Z. J. [1 ]
Gao, Y. [2 ]
Gui, Y. [2 ]
Zhu, M. [2 ]
机构：
[1] S China Univ Technol, Sch Mech & Automot Engn, Guangzhou 510641, Guangdong, Peoples R China
[2] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China
来源：
NANOMATERIALS BY SEVERE PLASTIC DEFORMATION: NANOSPD5, PTS 1 AND 2 | 2011年 / 667-669卷
基金：
中国国家自然科学基金;
关键词：
304 stainless steel; Equal channel angular pressing (ECAP); Mechanical properties; Optimization; COMPRESSIVE PROPERTIES; MECHANICAL-PROPERTIES; PLASTIC-DEFORMATION; STAINLESS-STEEL; BEHAVIOR; SHEAR; REFINEMENT; TENSILE; ALLOYS;
D O I：
10.4028/www.scientific.net/MSF.667-669.937
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The microstructure and mechanical properties of 304 stainless steel were investigated which was subjected to equal channel angular pressing (ECAP). Tensile strength, elongation, Vickers hardness of as-ECAPed and annealed ECAPed 304 stainless steel were systematically measured and compared and microstructure evolution during ECAP and ECAP+annealing was observed by OM and TEM. It was found that with the increasing of ECAP passes, the grain size of stainless steel was effectively refined to nanoscale, such as about 50 nm after 8 ECAP-passes. In addition, the dislocation density in ECAPed samplel increased greatly, consequently, the tensile strength and hardness of ECAPed 304 stainless steel increased and elongation decreased remarkably. After annealing at 600 degrees C for 10 min, the ductility of ECAPed stainless steel was improved greatly while grains did not have obvious growth, and strength did not change much. The above results showed that the optimization of strength and ductility in ultra-fined 304 stainless steel can be achieved by appropriate ECAP plus annealing processes.
引用
收藏
页码：937 / +
页数：2
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