连续退火工艺参数对1 180 MPa级含Nb增强成形性双相钢组织性能的影响

doi:10.13228/j.boyuan.issn1006-9356.20230489

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摘要为实现节能减排的目的,汽车车身正朝着轻量化、高质量的方向发展,DH钢因其优良的强塑性能而具有广泛的应用前景。基于实验室模拟连续退火与组织性能表征分析,研究开发了一种综合性能良好的1 180 MPa级含Nb增强成形性双相钢。连续退火试验结果表明,随着退火温度的升高,钢中马氏体、贝氏体含量升高,试验钢的抗拉强度在870 ℃升高至1 200 MPa;退火温度进一步上升时,马氏体回火程度增大且贝氏体含量增加导致钢的强度略微降低。随着过时效温度的升高,试验钢抗拉强度逐渐降低,伸长率在370 ℃升高至16.2%。基于连续退火试验结果与工业生产线特点,实现了DH1180钢的工业试制。所得样品显微组织由铁素体、马氏体、贝氏体、残余奥氏体(φ(γ)=6.62%)组成,组织中弥散分布着纳米级的(Nb,Ti)C析出相,呈现出优良的强塑性匹配,试验钢的抗拉强度为1 257 MPa,伸长率达到15.6%。DH1180钢的开发与应用为汽车用高强钢提供了更多的可能性。

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	杨玉环
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	赵征志

关键词 ：连续退火, 残余奥氏体, 析出相, 组织性能, 增强成形性双相钢

Abstract：In order to achieve the goal of energy conservation and emission reduction, automobile bodies are developing towards lightweight and high-quality direction. DH steel has a wide application prospect due to its excellent strength and plasticity performance. The high formability 1 180 MPa grade Nb-microalloyed dual phase steel, exhibiting excellent properties, had been developed through laboratory simulated continuous annealing and characterization analysis of microstructure and properties. The results of continuous annealing tests reveal that the increase of annealing temperature lead to corresponding rise in the content of martensite and bainite, consequently resulting in enhancement of tensile strength up to 1 200 MPa at 870 ℃. As the annealing temperature further increases, the volume fraction of tempered martensite and the bainite increases, resulting in slight decrease in strength. As the over-aging temperature increases, the tensile strength gradually decreases and the elongation increases to 16.2% at 370 ℃. Based on the continuous annealing test results and the feature of industrial production line, DH1180 continuous annealing plates was industrially produced. Its microstructure is composed of ferrite, martensite, bainite, and residual austenite(φ(γ)=6.62%), dispersed with nano-scaled (Nb,Ti)C precipitates, showing superior match of strength and plasticity with tensile strength of 1 257 MPa and elongation of 15.6%. The development and application of DH1180 steel provides more possibilities for high-strength steel for automobile.

Key words： continuous annealing retained austenite precipitates microstructure and property dual phase steel with high formability

收稿日期: 2023-08-25

基金资助:中信集团重大科技创新项目(2022ZXKYA06100); 新能源汽车材料生产应用示范平台项目(TC180A6MR-1); 中央高校基本科研业务费资助项目(FRF-BD-23-01)

通讯作者: 赵征志(1977—), 男, 博士, 研究员; E-mail: zhaozhzhi@ustb.edu.cn

作者简介: 杨玉环(2000—), 女, 硕士生; E-mail: M202111278@xs.ustb.edu.cn

引用本文:

杨玉环, 褚晓红, 路洪洲, 韩赟, 阳锋, 赵征志. 连续退火工艺参数对1 180 MPa级含Nb增强成形性双相钢组织性能的影响[J]. 中国冶金, 2024, 34(1): 72-80. YANG Yuhuan, CHU Xiaohong, LU Hongzhou, HAN Yun, YANG Feng, ZHAO Zhengzhi. Effect of continuous annealing process parameters on microstructure and properties of 1 180 MPa grade Nb-microalloyed dual phase steel with high formability[J]. China Metallurgy, 2024, 34(1): 72-80.

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http://www.zgyj.ac.cn/CN/10.13228/j.boyuan.issn1006-9356.20230489 或 http://www.zgyj.ac.cn/CN/Y2024/V34/I1/72

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