加热工艺对1800 MPa级热成形钢冷弯性能的影响

doi:10.13251/j.issn.0254-6051.2021.04.022

金属热处理 ›› 2021, Vol. 46 ›› Issue (4): 126-130.DOI: 10.13251/j.issn.0254-6051.2021.04.022

加热工艺对1800 MPa级热成形钢冷弯性能的影响

晋家春, 邓宗吉, 杨峥, 李子涛, 卢茜倩, 崔磊, 刘永刚, 詹华

马鞍山钢铁股份有限公司技术中心, 安徽马鞍山 243000

收稿日期:2020-10-12 出版日期:2021-04-25 发布日期:2021-05-08
作者简介:晋家春(1988—),男,高级工程师,硕士,主要研究方向为热成形钢产品研发和热成形工艺,E-mail:jinjiachun1988@163.com

Effect of heating process on cold bending ability of 1800 MPa grade hot stamped steel

Jin Jiachun, Deng Zongji, Yang Zhen, Li Zitao, Lu Qianqian, Cui Lei, Liu Yonggang, Zhan Hua

Technology Center, Ma'anshan Iron and Steel Co., Ltd., Ma'anshan Anhui 243000, China

Received:2020-10-12 Online:2021-04-25 Published:2021-05-08

摘要/Abstract

摘要： 利用冷弯试验机、光学显微镜、扫描电镜等研究手段,分析了热冲压成形工艺过程中的加热保温时间对1800 MPa级热成形钢微观组织和冷弯性能的影响。结果表明,随保温时间的增加,试验钢热冲压成形后的原始奥氏体晶粒长大,当保温时间为5 min时,原始奥氏体晶粒尺寸约为5 μm,细小且均匀,当保温时间达到9 min时,出现异常粗大晶粒。冷弯角与原始奥氏体晶粒尺寸关系密切,冷弯角随着晶粒的长大而减小,在5 min时获得最大冷弯角54.5°。

关键词: 1800 MPa级热成形钢, 原始奥氏体晶粒尺寸, 热冲压, 加热保温时间, 冷弯性能

Abstract: Effect of holding time in pre-heating process for hot stamping on microstructure and cold bending property of a 1800 MPa grade hot stamped steel was analyzed by means of cold bending test machine, optical microscope and scanning electron microscope. The results show that with the increase of holding time, the prior austenite grains of the hot stamped steel grow up. When the holding time is 5 min, the prior austenite grains are fine and uniform with the average size of about 5 μm. When the holding time reaches 9 min, abnormal coarse grains appear. The cold bending angle is closely related to the prior austenite grain size, i.e., it decreases with grain growth. The maximum cold bending angle is 54.5° when the holding time is 5 min.

Key words: 1800 MPa grade hot stamped steel, prior austenite grain size, hot stamping, holding time in heating, cold bending ability

中图分类号:

TG156

晋家春, 邓宗吉, 杨峥, 李子涛, 卢茜倩, 崔磊, 刘永刚, 詹华. 加热工艺对1800 MPa级热成形钢冷弯性能的影响[J]. 金属热处理, 2021, 46(4): 126-130.

Jin Jiachun, Deng Zongji, Yang Zhen, Li Zitao, Lu Qianqian, Cui Lei, Liu Yonggang, Zhan Hua. Effect of heating process on cold bending ability of 1800 MPa grade hot stamped steel[J]. Heat Treatment of Metals, 2021, 46(4): 126-130.

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加热工艺对1800 MPa级热成形钢冷弯性能的影响

Effect of heating process on cold bending ability of 1800 MPa grade hot stamped steel

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