锻压技术

连续退火温度对高强IF钢组织及力学性能的影响

英文标题：Influence of continuous annealing temperature on microstructure and mechanical properties for high strength IF steel

作者：陈爱华霍昌军岳重祥李化龙

单位：江苏省（沙钢）钢铁研究院江苏沙钢集团有限公司

关键词：连续退火高强IF钢退火温度力学性能织构

分类号：TG142.1

出版年,卷(期):页码：2018,43(7):192-196

摘要：

针对不同的连续退火温度，研究了其对高强IF钢的组织、织构及力学性能的影响。结果表明：当连续退火温度为760 ℃ 时，退火板再结晶不完全，屈服强度较高，伸长率较低，应变硬化指数n值和塑性应变比r值较低，｛111｝织构较弱；随着退火温度的升高，拉长晶粒完全消失，退火板晶粒尺寸增大且均匀性增强，屈服强度降低，伸长率、n值和r值上升。退火温度在790 ℃以上时，退火板织构以γ织构为主；随着退火温度继续升高，退火板γ织构中{111}<110>和{111}<112>取向强度差减小，各向同性增强。升高连续退火温度有利于提高高强IF钢的组织均匀性、成形性能以及深冲性能。

The influences of different continuous annealing temperatures on the microstructure,texture and mechanical properties of high strength IF steel were researched. The results show that the grains of annealing plates are not fully recrystallized when the continuous annealing temperature is 760 ℃, and the yield strength is higher. On the contrary, the elongation, the strain hardening exponent n value, the plastic strain ratio r value and the {111} texture strength are lower. With the increasing of annealing temperature, the elongated grains disappear, the grain size and uniformity of annealing plates increase, the yield strength decreases, and the elongation, n value and r value increase. When the annealing temperature is higher than 790 ℃, the γ texture is the main texture in annealing plates. With the continuously increasing of annealing temperature, the difference of {111}<110> and {111}<112> orientation strength decreases as well as the homogeneity increases. Above all, rising the continuous annealing temperature is benefitial for increasing microstructure uniformity, formability and deep drawability of high strength IF steel.

基金项目：

陈爱华（1985-），女，硕士，工程师，E-mail：cahly02@163.com

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