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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.

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