两相区连续退火均热温度对Q&P980钢组织性能的影响

doi:10.13251/j.issn.0254-6051.2022.08.030

金属热处理 ›› 2022, Vol. 47 ›› Issue (8): 177-181.DOI: 10.13251/j.issn.0254-6051.2022.08.030

两相区连续退火均热温度对Q&P980钢组织性能的影响

刘麟¹, 徐海卫², 李红斌¹, 韩赟², 田亚强¹, 郑小平¹, 陈连生¹

1.华北理工大学教育部现代冶金技术重点实验室, 河北唐山 063210;
2.首钢京唐钢铁联合有限责任公司技术中心, 河北唐山 063200

收稿日期:2022-03-04 修回日期:2022-07-02 出版日期:2022-08-25 发布日期:2022-09-19
通讯作者: 陈连生,教授,博士,E-mail:kyckfk@ncst.edu.cn
作者简介:刘麟(1996—),男,硕士研究生,主要研究方向为材料加工新技术与组织性能控制,E-mail:929549106@qq.com。
基金资助:
河北省科技厅重点研发计划项目(20311004D);河北省自然科学基金高端钢铁冶金联合基金(E2020209124,E2020209127);河北省高等学校科学技术研究项目(ZD2019064)

Effect of intercritical continuous annealing temperature on microstructure and properties of Q&P980 steel

Liu Lin¹, Xu Haiwei², Li Hongbin¹, Han Yun², Tian Yaqiang¹, Zheng Xiaoping¹, Chen Liansheng¹

1. Key Laboratory of Modern Metallurgical Technology, Ministry of Education, North China University of Technology, Tangshan Hebei 063210, China;
2. Technology Center, Shougang Jingtang Iron and Steel United Co., Ltd., Tangshan Hebei 063200, China

Received:2022-03-04 Revised:2022-07-02 Online:2022-08-25 Published:2022-09-19

摘要/Abstract

摘要： 以冷轧Q&P钢的连续退火生产为工艺背景,采用两相区均热保温+缓冷+快冷至Ms与Mf点之间进行配分的热处理工艺,研究了两相区不同均热温度对低碳硅锰系Q&P980合金高强钢微观组织和力学性能的影响。结果表明,随着两相区均热温度的升高,铁素体含量降低,马氏体所占比例升高,且板条尺度有所增加;随着均热温度的升高,残留奥氏体含量先升高至最大值(7.2%)后降低;随着均热温度继续升高,基体内部马氏体的含量增加,导致材料抗拉强度增加,而伸长率的变化趋势则与残留奥氏体含量变化趋势相似;在配分温度为310 ℃时,最佳的均热温度区间为765.24~812.56 ℃,其中在790 ℃均热时,抗拉强度为1052 MPa,伸长率为22.9%,强塑积为24 090.8 MPa·%。

关键词: 连续退火, 均热温度, Q&P980钢, 力学性能, 残留奥氏体

Abstract: Taking continuous annealing production of cold rolled Q&P steel as the technological background, the heat treatment process of soaking and heat preservation in two-phase zone+slow cooling+rapid cooling to partitioning between Ms and Mf points was adopted, and the effects of different soaking temperatures in the two-phase zone on microstructure and mechanical properties of low-carbon silicon manganese alloyed Q&P980 high-strength steel were studied. The results show that with the increase of soaking temperature in the two-phase region, the ferrite content decreases, the proportion of martensite and lath size increases, the content of retained austenite first increases to 7.2% and then decreases. With the further increase of soaking temperature, the tensile strength increases monotonically due to the increase of martensite content in the matrix, while the change trend of elongation is similar to that of retained austenite content. When the partitioning temperature is 310 ℃, the best soaking temperature range is 765.24-812.56 ℃. When soaking at 790 ℃, the tensile strength is 1052 MPa, the elongation is 22.9%, and the strength-elongation production is 24 090.8 MPa·%.

Key words: continuous annealing, soaking temperature, Q&P980 steel, mechanical properties, retained austenite

中图分类号:

TG156.1

刘麟, 徐海卫, 李红斌, 韩赟, 田亚强, 郑小平, 陈连生. 两相区连续退火均热温度对Q&P980钢组织性能的影响[J]. 金属热处理, 2022, 47(8): 177-181.

Liu Lin, Xu Haiwei, Li Hongbin, Han Yun, Tian Yaqiang, Zheng Xiaoping, Chen Liansheng. Effect of intercritical continuous annealing temperature on microstructure and properties of Q&P980 steel[J]. Heat Treatment of Metals, 2022, 47(8): 177-181.

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两相区连续退火均热温度对Q&P980钢组织性能的影响

Effect of intercritical continuous annealing temperature on microstructure and properties of Q&P980 steel

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