980 MPa级热浸镀钢的新型淬火配分工艺及组织性能

doi:10.13251/j.issn.0254-6051.2021.11.022

金属热处理 ›› 2021, Vol. 46 ›› Issue (11): 143-146.DOI: 10.13251/j.issn.0254-6051.2021.11.022

980 MPa级热浸镀钢的新型淬火配分工艺及组织性能

王开泰, 许云波, 徐兵, 顾兴利, 王源, 李佳彧, 倪申亚, 龚殿尧

东北大学轧制技术及连轧自动化国家重点实验室, 辽宁沈阳 110819

收稿日期:2021-05-24 出版日期:2021-11-25 发布日期:2021-12-08
通讯作者: 许云波,教授,博士,E-mail:yunbo_xu@126.com
作者简介:王开泰(1996—),男,硕士研究生,主要研究方向为先进汽车高强钢,E-mail:wangkaitaiwoqqwx@163.com
基金资助:
国家重点研发计划(2017YFB0304105,2017YFB0304400);国家自然科学基金 (51974085,51674080);山东省重点研发计划(2019TSLH0103)

Novel Q&P process, microstructure and mechanical properties of a 980 MPa grade hot-dip galvanized steel

Wang Kaitai, Xu Yunbo, Xu Bing, Gu Xingli, Wang Yuan, Li Jiayu, Ni Shenya, Gong Dianyao

State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang Liaoning 110819, China

Received:2021-05-24 Online:2021-11-25 Published:2021-12-08

摘要/Abstract

摘要： 针对980 MPa级热浸镀钢,在C-Mn-Si-Al系成分设计基础上,开发了一种以高淬火温度(Ms点以上)为特征的新型淬火配分工艺(High-quenching-temperature quenching and partitioning,HQ&P),并与传统的一步过时效工艺(Quenching and austempering,QAT)相比较,分析不同热处理工艺下的组织结构与力学性能变化规律。试验结果表明,试验钢组织为临界区铁素体、贝氏体和马奥岛复相结构。一步过时效工艺下,随退火温度的增加,铁素体含量逐渐减少,贝氏体含量逐渐增加;高温淬火后配分处理的两步工艺下,试验钢发生了两次贝氏体转变,最终贝氏体含量更高,组织更加均匀且含有少量的残留奥氏体。在HQ&P工艺下,试验钢获得最佳的力学性能,即抗拉强度1005 MPa,伸长率26.1%。

关键词: 热浸镀钢, 膨胀曲线, 淬火配分工艺, 贝氏体转变, 微观组织, 力学性能

Abstract: A novel high-quenching-temperature quenching and partitioning (HQ&P) process was proposed to investigate the microstructure and mechanical properties of a 980 MPa grade C-Mn-Si-Al hot-dip galvanized steel by comparison with the conventional quenching and austempering (QAT) process. The results show that the desired duplex microstructure consisting of blocky ferrite, bainite, and some M/A islands is achieved in the tested steel. With the increase of annealing temperature during QAT process, the content of ferrite gradually decreases while the content of bainite increases. During the HQ&P process, the bainitic transformation occurs twice, which results in a more uniform microstructure with more bainite and a small amount of retained austenite. The best mechanical properties of the tested steel treated by HQ&P process are obtained with the tensile strength of 1005 MPa and the elongation of 26.1%.

Key words: hot-dip galvanized steel, dilatation curve, quenching and partitioning process, bainitic transformation, microstructure, mechanical properties

中图分类号:

TG142.1

王开泰, 许云波, 徐兵, 顾兴利, 王源, 李佳彧, 倪申亚, 龚殿尧. 980 MPa级热浸镀钢的新型淬火配分工艺及组织性能[J]. 金属热处理, 2021, 46(11): 143-146.

Wang Kaitai, Xu Yunbo, Xu Bing, Gu Xingli, Wang Yuan, Li Jiayu, Ni Shenya, Gong Dianyao. Novel Q&P process, microstructure and mechanical properties of a 980 MPa grade hot-dip galvanized steel[J]. Heat Treatment of Metals, 2021, 46(11): 143-146.

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980 MPa级热浸镀钢的新型淬火配分工艺及组织性能

Novel Q&P process, microstructure and mechanical properties of a 980 MPa grade hot-dip galvanized steel

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