锰含量和淬火温度对Q&P钢组织和性能的影响
Influence of Mn Content and Quenching Temperature on Microstructure and Mechanical Properties of Q&P Steel
杨海峰1,2, 王 利2, 冯伟骏2, 芦凤桂1
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作者单位：1. 上海交通大学 材料科学与工程学院, 上海 200240; 2. 宝山钢铁股份有限公司 汽车用钢开发与应用技术国家重点实验室, 上海 201900)
中文关键字：淬火与分配钢； 残余奥氏体； 锰元素； 淬火温度； 力学性能
英文关键字：Q&P steel; retained austenite; Mn element; quenching temperature; mechanical properties
中文摘要：在C-Mn-Si系普通TRIP钢成分的基础上，设计了进一步提高锰含量的钢种，对两种钢进行Q&P处理，测试热处理后试样的力学性能和残余奥氏体的含量，并且用扫描电镜观察显微组织和拉伸断口形貌，采用热膨胀仪测试分配阶段的体积膨胀。结果表明，不同锰含量的C-Mn-Si钢经Q&P处理后，室温组织中有不同含量的残余奥氏体，且都达到强度和塑性的较好配合；锰含量提高并选取合适的淬火温度后，残余奥氏体含量及稳定性提高，抗拉强度显著提升的同时保持了较高的伸长率。
英文摘要：The C-Si-Mn steel added Mn was designed on the basis of traditional TRIP steel, then quenching and partitioning (Q&P) heat treatment at different quenching temperature was carried out. The mechanical properties and content of retained austenite were measured. The microstructure and fracture surface morphology after stretching testing were observed by SEM. The expansion of the specimen during partitioning processing was measured using thermal dilatometer. The results show that these two kinds of C-Si-Mn steel has excellent combination of strength and ductility with different content of retained austenite. The content and stability of retained austenite is higher after more Mn is added, and also the strength is higher with preferable elongation when the appropriate quenching temperature is chose.