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金属学报  2012, Vol. 48 Issue (6): 641-648    DOI: 10.3724/SP.J.1037.2012.00042
  论文 本期目录 | 过刊浏览 |
残余奥氏体增强低碳Q-P-T钢塑性的新效应
王颖,张柯,郭正洪,陈乃录,戎咏华
上海交通大学材料科学与工程学院, 上海 200240
A NEW EFFECT OF RETAINED AUSTENITE ON DUCTILITY ENHANCEMENT OF LOW CARBON Q-P-T STEEL
WANG Ying, ZHANG Ke, GUO Zhenghong, CHEN Nailu, RONG Yonghua
School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240
全文: PDF(4379 KB)  
摘要: 低碳Fe-0.25C-1.48Mn-1.20Si-1.51Ni-0.05Nb (质量分数, %) 钢通过新型Q-P-T工艺处理后获得高的抗拉强度和良好延伸率的综合性能. 对该低碳Q-P-T钢在拉伸过程中残余奥氏体含量的XRD 测定和形变孪晶马氏体的TEM观测, 证明了相变诱发塑性(TRIP) 效应的存在. 基于形变过程中马氏体和残余奥氏体中的平均位错密度测定和 TEM的观察, 验证了在中碳钢中最新发现的残余奥氏体吸收位错(DARA) 新效应在低碳钢中同样存在, 由此提出了DARA效应产生的条件, 阐明了残余奥氏体增强高强度钢塑性的机制.
关键词 高强度钢Q-P-T工艺平均位错密度残余奥氏体残余奥氏体吸收位错 (DARA) 效应    
Abstract:A low carbon Fe-0.25C-1.48Mn-1.20Si-1.51Ni-0.05Nb (mass fraction, %) steel exhibits the combination of high tensile strength and good elongation after treated by a novel quenching-partitioning-tempering (Q-P-T) process. The variation in volume fraction of retained austenite in this steel with strain is measured by XRD, and the deformed twin-type martensite plates are also observed by TEM, from which the transformation induced plasticity (TRIP) effect in this steel is confirmed. Based on the measurement of average dislocation densities in both martensite and retained austenite combined with TEM observation, the effect of dislocation absorption by retained austenite (DARA) is found in the low carbon steel, similar to that in the medium carbon steel proposed recently, from which the generation conditions of DARA effect is proposed, and the mechanism of retained austenite on ductility enhancement of high strength steel is clarified.
Key wordshigh strength steel    quenching-partitioning-tempering (Q-P-T) process    average dislocation density    retained austenite    effect of dislocation absorption by retained austenite (DARA)
收稿日期: 2012-01-19      出版日期: 2012-06-11
ZTFLH:  TG142  
基金资助:

国家自然科学基金重点项目51031001和国家自然科学基金面上项目51071101 资助

通讯作者: 戎咏华     E-mail: yhrong@sjtu.edu.cn
作者简介: 王颖, 男, 1982年生, 博士生

引用本文:

王颖,张柯,郭正洪,陈乃录,戎咏华. 残余奥氏体增强低碳Q-P-T钢塑性的新效应[J]. 金属学报, 2012, 48(6): 641-648.
WANG Ying, ZHANG Ke, GUO Zhenghong, CHEN Nailu, RONG Yonghua. A NEW EFFECT OF RETAINED AUSTENITE ON DUCTILITY ENHANCEMENT OF LOW CARBON Q-P-T STEEL. Acta Metall Sin, 2012, 48(6): 641-648.

链接本文:

http://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00042      或      http://www.ams.org.cn/CN/Y2012/V48/I6/641

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