锻压技术

退火温度对C-Mn-Nb-Ti系深冲双相钢组织及性能的影响

英文标题：Influence of annealing temperature on microstructure and properties of C-Mn-Nb-Ti deep drawing dual-phase steel

作者：何硕杨明维闫佳鹤张淼冯运莉

关键词：深冲双相钢退火温度组织织构性能

分类号：TG142.1

出版年,卷(期):页码：2025,50(8):248-247

摘要：

采用OM、SEM、EBSD和电子万能拉伸试验机等，对不同退火温度下C-Mn-Nb-Ti系深冲双相钢的组织、成形性能、力学性能进行研究。结果表明：冷轧板在不同退火温度下退火240 s后，组织均由铁素体和少量附着在晶界处的马氏体和碳化物组成；随着退火温度的升高，再结晶程度增加，马氏体含量增加，平均晶粒尺寸逐渐增加，{111}γ织构的取向密度先升高后降低，屈服强度和抗拉强度逐渐增加，伸长率、r值和n值先升高再降低。研究得到，在860 ℃退火后的实验钢的综合性能最优，其屈服强度为351.7 MPa、抗拉强度为526.1 MPa、伸长率为30.8%，r值为1.42、n值为0.21。

The microstructure, formability and mechanical properties of C-Mn-Nb-Ti deep drawing dual-phase steel at different annealing temperatures were studied by OM, SEM, EBSD and electronic universal tensile testing machine. The results show that after annealing for 240 s at different annealing temperatures, the microstructure of cold-rolled sheet is composed of ferrite and a small amount of martensite and carbide attached to the grain boundary. As the annealing temperature increases, the degree of recrystallization increases, the content of martensite increases, the average grain size gradually increases, the orientation density of {111}γ texture increases first and then decreases, the yield strength and tensile strength gradually increase, and the elongation, r value and n value exhibit a trend of increasing first and then decreasing. It is concluded that the comprehensive performance of the experimental steel annealed at 860 ℃ is the best, with the yield strength of 351.7 MPa, the tensile strength of 526.1 MPa, the elongation of 30.8%, the r value of 1.42 and the n value of 0.21.

基金项目：

国家自然科学基金资助项目（51974134）；河北省创新能力提升计划项目（24461002D）

作者简介：何硕（1998-），男，硕士研究生 E-mail：15103316238@163.com 通信作者：冯运莉（1965-），女，博士，教授 E-mail：tsfengyl@163.com

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