退火温度对LH800空冷强化钢组织与力学性能的影响

doi:10.11896/cldb.21080047

材料导报

2023, Vol. 37

Issue (3): 21080047-6 https://doi.org/10.11896/cldb.21080047

金属与金属基复合材料

退火温度对LH800空冷强化钢组织与力学性能的影响

罗翔¹, 米振莉^1,*, 吴彦欣¹, 杨永刚^1,2, 江海涛¹, 胡宽辉³

1 北京科技大学工程技术研究院,北京 100083
2 瑞典皇家理工学院材料科学与工程系,瑞典斯德哥尔摩 SE-10044
3 宝山钢铁股份有限公司中央研究院,上海 201900

Effect of Annealing Temperature on Microstructure and Mechanical Properties of Air-hardening LH800 Steel

LUO Xiang¹, MI Zhenli^1,*, WU Yanxin¹, YANG Yonggang^1,2, JIANG Haitao¹, HU Kuanhui³

1 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
2 Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellvägen 23, Stockholm, SE-10044, Sweden
3 Central Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China

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摘要为获得具备良好冷成形性能的空冷强化钢,以冷轧LH800为研究对象,采用SEM、EBSD、TEM等技术手段,研究了该钢种在罩式退火过程中的组织演变和力学性能变化。研究结果表明:在600~700 ℃退火得到了铁素体+碳化物组织,拉伸曲线出现明显的屈服平台,并且屈服平台长度随退火温度的升高而减小。随着退火温度升高,铁素体晶内纳米级碳化物数量逐渐减少,晶界粗大碳化物数量逐渐增多,小角度晶界体积分数逐渐减小,且局部取向差(KAM)值逐渐减小。当退火温度超过700 ℃时,显微组织为铁素体+马氏体+碳化物,拉伸曲线无屈服平台出现。随着退火温度的进一步升高,马氏体体积分数逐渐增加,KAM值也逐渐增大。力学性能结果显示:在700 ℃退火保温4 h,空冷强化钢的屈服强度和抗拉强度最低,延伸率最高,具备最佳的冷成形性能。本工作基于冷轧LH800退火过程的显微组织和纳米级碳化物的演变,揭示了LH800出现屈服平台现象的本质,并获得了该钢种具备最佳冷成形性能的关键工艺参数。

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	胡宽辉

关键词: 退火温度 LH800空冷强化钢组织演变力学性能纳米级碳化物屈服平台

Abstract: In order to obtain air-hardening steel with good cold formability, the microstructure evolution and mechanical properties of cold rolled LH800 steel during the batch annealing were studied by means of scanning electron microscopy, electron back scatter diffraction, transmission electron microscopy, and other technical means. The results showed that the ferrite + carbide structure was obtained by annealing between 600 ℃ and 700 ℃, the tensile curve had an obvious yield plateau, and the length of the yield plateau decreased with annealing temperature increasing. As the annealing temperature increased, the nanoscale carbides inside the ferrite grain gradually decreased, the coarse carbides at the grain boundary gradually increased, the volume fraction of low-angle grain boundaries gradually decreased, and the kernel average misorientation (KAM) value gradually decreased. When the annealing temperature exceeded 700 ℃, the microstructure was ferrite + martensite + carbide, and no yield plateau appeaed in the tensile curve. As the annealing temperature continued to increase, the volume fraction of martensite gradually increased, as did the KAM value. The mechanical property analysis showed that, after annealing at 700 ℃ for 4 h, air-hardening steel had the lowest yield strength and tensile strength, the highest elongation, and the best cold-forming performance. Based on the evolution of the microstructure and the nanoscale carbides of cold-rolled LH800 steel during the annealing process, this work revealed the essence of the yield-plateau phenomenon of LH800 steel and obtained its key process parameters of best cold-forming-performance.

Key words: annealing temperature air-hardening steel LH800 microstructure evolution mechanical property nano-scale carbides yield plateau

出版日期: 2023-02-10 发布日期: 2023-02-23

ZTFLH:

TG156.2

基金资助: 国家重点研发计划(2017YFB0304404)

通讯作者: ^*zhenli_mi@163.com，米振莉,研究员,博士研究生导师,北京科技大学工程技术研究院副院长,中国金属学会金属材料深度加工分会秘书长,中国汽车工程学会理事。主要研究方向是金属材料的轧制工艺、先进汽车用钢开发及钢材深加工等,从事钢铁材料的技术研发和钢材品种的性能优化。在研的国家和企业项目数十项,发表学术论文百余篇,获得授权发明专利近20项,以及市级、省部级多项科技奖励。

作者简介: 罗翔,北京科技大学博士研究生。2013年6月,在南昌航空大学获得金属材料专业学士学位;2017年6月,在昆明理工大学获得材料工程专业硕士学位。目前,在米振莉教授指导下进行学术研究,参与多个国家重点研发计划项目,主要研究领域为汽车用先进高强钢的品种开发及性能优化。

引用本文:

罗翔, 米振莉, 吴彦欣, 杨永刚, 江海涛, 胡宽辉. 退火温度对LH800空冷强化钢组织与力学性能的影响[J]. 材料导报, 2023, 37(3): 21080047-6.
LUO Xiang, MI Zhenli, WU Yanxin, YANG Yonggang, JIANG Haitao, HU Kuanhui. Effect of Annealing Temperature on Microstructure and Mechanical Properties of Air-hardening LH800 Steel. Materials Reports, 2023, 37(3): 21080047-6.

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http://www.mater-rep.com/CN/10.11896/cldb.21080047 或 http://www.mater-rep.com/CN/Y2023/V37/I3/21080047

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