Mn元素对热冲压钢镀锌层组织演变的影响

doi:10.13251/j.issn.0254-6051.2022.04.015

金属热处理 ›› 2022, Vol. 47 ›› Issue (4): 93-99.DOI: 10.13251/j.issn.0254-6051.2022.04.015

Mn元素对热冲压钢镀锌层组织演变的影响

刘丽艳¹, 毕文珍^1,2, 韦习成¹

1.上海大学材料科学与工程学院, 上海 200444;
2.宝山钢铁股份有限公司中央研究院汽车用钢开发与应用技术国家重点实验室(宝钢), 上海 200126

收稿日期:2021-12-09 修回日期:2022-01-06 出版日期:2022-04-25 发布日期:2022-05-19
通讯作者: 韦习成,研究员,博士生导师,博士,E-mail: wxc1028@shu.edu.cn
作者简介:刘丽艳(1996—),女,硕士研究生,主要研究方向为汽车用钢表面处理,E-mail: liuliyan7287@163.com。
基金资助:
上海汽车工业科技发展基金(1827)

Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel

Liu Liyan¹, Bi Wenzhen^1,2, Wei Xicheng¹

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2. State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel), Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 200126, China

Received:2021-12-09 Revised:2022-01-06 Online:2022-04-25 Published:2022-05-19

摘要/Abstract

摘要： 采用SEM和XRD对加热温度800 ℃、不同保温时间下镀锌热冲压成形钢的镀锌层表面形貌和截面组织进行了表征,利用EPMA、WDX、EDS与GDOES分析了Mn在元素相互扩散过程中对镀层组织演变的影响。结果表明,随保温时间从3 min延长至7 min,镀层表面形貌由“丘陵”演变为“火山口”后逐渐球化。镀层在保温5 min后形成的“火山口”形貌导致镀层厚度不均匀且波动幅度大。镀层物相随保温时间延长而发生变化,保温时间为3 min时,镀层的物相主要由Fe₄Zn₉和δ相组成;延长保温时间至5 min 时,镀层主要由Fe₄Zn₉和α-Fe(Zn)相组成,Mn富集在近基体侧的α-Fe(Zn)相上形成富锰亚层;当保温7 min时,Mn元素不断从基体扩散至镀层表面,导致Mn元素富集面积减小且富集区朝镀层表面方向移动。

关键词: Mn元素, 22MnB5钢, 热浸镀锌, 组织演变

Abstract: Surface morphology and cross-sectional microstructure of the galvanized coating of hot stamping steel after holding at 800 ℃for different time were characterized by means of SEM and XRD, and the influence of Mn element on microstructure evolution of the coating during the interdiffusion of elements was analyzed by means of EPMA、WDX、EDS and GDOES. The results show that with the extension of holding time from 3 min to 7 min, the surface morphology of coating evolves from “hill” to “crater”, then gradually spheroidizes. The “crater” morphology on coating surface leads to uneven coating thickness and large fluctuation after holding for 5 min. The coating phase changes with the prolongation of holding time. The coating is mainly composed of Fe₄Zn₉ and δ phases after holding for 3 min. When prolonging the holding time to 5 min, the coating is mainly composed of Fe₄Zn₉ and α-Fe(Zn) phases, and Mn is enriched in the α-Fe(Zn) phase near the substrate to form a manganese-rich sublayer. After holding for 7 min, the area of Mn enrichment decreases and moves towards the coating surface due to the continuous diffusion of Mn element from the substrate to the surface of the coating.

Key words: Mn element, 22MnB5 steel, hot-dip galvanizing, microstructure evolution

中图分类号:

TG156.1

刘丽艳, 毕文珍, 韦习成. Mn元素对热冲压钢镀锌层组织演变的影响[J]. 金属热处理, 2022, 47(4): 93-99.

Liu Liyan, Bi Wenzhen, Wei Xicheng. Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel[J]. Heat Treatment of Metals, 2022, 47(4): 93-99.

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Mn元素对热冲压钢镀锌层组织演变的影响

Effect of Mn element on microstructure evolution of galvanized coating of hot stamping steel

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