锻压技术

冷轧压下率对深冲双相钢组织与性能的影响

英文标题：Influence of cold rolling reduction rate on microstructure and properties of deep drawing dual-phase steel

作者：王云宝杨明维冯运莉张淼

分类号：TG142.1

出版年,卷(期):页码：2025,50(8):152-160

摘要：

利用OM、SEM、EBSD和万能拉伸试验机等手段，研究了冷轧压下率对深冲双相钢微观组织、织构演变、力学性能及深冲性能的影响。研究表明，对不同压下率（70%、75%和80%）的冷轧板在840 ℃退火240 s后，其室温组织均由铁素体、马氏体和碳化物组成。随着压下率的增加，其平均晶粒尺寸减小，再结晶程度增加，铁素体含量逐渐减少，马氏体及碳化物含量逐渐增多，大角度晶界数量减少，亚晶界与小角度晶界数量逐渐增加，γ织构强度逐渐升高，α织构强度逐渐降低。冷轧退火板的抗拉强度随着压下率的增加而逐渐升高，屈服强度、伸长率及塑性应变比r值均呈现先升高后降低的趋势，加工硬化指数n值有所下降。其中，75%压下率的冷轧退火板具有最佳的力学性能及深冲性能，其抗拉强度为499.2 MPa、屈服强度为320.1 MPa、伸长率为32.01%、r值为1.40、n值为0.20。

The influences of cold rolling reduction on microstructure, texture evolution, mechanical properties and deep drawing performance of deep drawing dual phase steel were studied by means of OM, SEM, EBSD and universal tensile test machine. The research shows that after annealing at 840 ℃ for 240 s, the room temperature microstructure of cold-rolled sheets with different reduction rates (70%, 75% and 80%) consists of ferrite, martensite and carbides. As the reduction rate increases, the average grain size decreases, the degree of recrystallization increases, the content of ferrite gradually decreases, the content of martensite and carbides gradually increases, the number of high-angle grain boundaries decreases, the number of sub-grain and low-angle grain boundaries gradually increases, the strength of γ-texture gradually increases, and the strength of α-texture gradually decreases. As the reduction rate increases, the tensile strength of the cold-rolled annealed sheet increases gradually,the yield strength, elongation and plastic strain ratio r value all show a trend of first increase and then decrease, and the n value of work hardening index decreases. Among them, the cold-rolled annealed sheet with the reduction rate of 75% has the best mechanical properties and deep drawing performance, with the tensile strength of 499 MPa, the yield strength of 320.1 MPa, the elongation of 32.01%,the r value of 1.40 and the n value of 0.2.

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：王云宝（1999-），男，硕士研究生 E-mail：wyb15100311071@163.com 通信作者：冯运莉（1965-），女，博士，教授 E-mail：tsfengyl@163.com

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