| DP980-GA双相钢色差斑和黑点缺陷分析与控制 |
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| 引用本文： | 张鹏,刘学良,周屿,贾冬梅.DP980-GA双相钢色差斑和黑点缺陷分析与控制[J].金属热处理,2021,46(1):230-234. |
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| 作者姓名： | 张鹏 刘学良 周屿 贾冬梅 |
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| 作者单位： | 华菱安赛乐米塔尔汽车板有限公司,湖南 娄底 417000 |
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| 摘 要： | 利用扫描电镜分析了DP980-GA双相钢镀层表面出现色差斑和黑点缺陷的原因,阐述了缺陷形成的机理。结果表明:退火炉加热段的湿气氛不充分、氢气含量过高,快冷段的带钢温度过低,引起Mn、Cr等合金元素在基体表面的氧化富集,影响Zn-Fe之间的扩散均匀性;带钢经热处理后入锅温度过高,镀层的热镀锌合金化程度加剧,导致基体铁从金属氧化物边界扩散显著。在实际生产中,通过调整退火炉的湿气氛注入量,注入方式由带钢的单面改为双面;提高带钢的快冷温度;降低炉内热区的氢气含量和带钢的入锅温度等措施,合金化镀层表面的色差斑和黑点缺陷得到了较好控制。
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| 关 键 词： | 双相钢 氧化 富集 扩散 热镀锌合金化 |
| 收稿时间： | 2020-06-08 |
Analysis and control of color difference and black spots defects on the surface of DP980-GA dual-phase steel |
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| Zhang Peng,Liu Xueliang,Zhou Yu,Jia Dongmei.Analysis and control of color difference and black spots defects on the surface of DP980-GA dual-phase steel[J].Heat Treatment of Metals,2021,46(1):230-234. |
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| Authors: | Zhang Peng Liu Xueliang Zhou Yu Jia Dongmei |
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| Affiliation: | Valin ArcelorMittal Automotive Steel Co.,Ltd.,Loudi Hunan 417000,China |
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| Abstract: | Causes of color difference and black spots defects on the coating surface of DP980-GA dual phase steel were analyzed by means of SEM,and the mechanism of defects formation was discussed.The results show that insufficient wet gas,too high content of hydrogen in annealing heating section and too low temperature of strip in annealing rapid cooling section cause the oxidation and enrichment of alloy elements Mn and Cr on the surface of strip,which affects the uniformity of diffusion between Zn and Fe;too high immersing temperature of strip after heat treatment increases the galvannealing degree of coating and causes significant diffusion of Fe from the boundary of alloy oxidation.During practical production,technological measures were adopted such as adjusting the amount of wet gas injection in annealing heating section,changing wet gas injection mode from single side to double side,increasing the temperature of strip in annealing rapid cooling section and decreasing hydrogen content of annealing heating section and the immersing temperature of strip,and color difference and black spots defects on the surface of alloy coating were effectively controlled. |
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| Keywords: | dual-phase steel oxidation enrichment diffusion galvannealing |
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