加热温度对Al-Si涂层热成形钢组织及性能的影响

doi:10.13251/j.issn.0254-6051.2022.10.039

摘要/Abstract

摘要： 利用粗糙度仪、扫描电镜、硬度计、辉光放电原子发射光谱仪等检测方法,研究分析了热冲压成形工艺过程中的加热温度对Al-Si涂层22MnB5热成形钢组织及性能的影响。结果表明,随着加热温度的升高,Fe沿垂直于表面方向由热成形钢基体向Al-Si涂层表面的迁移量逐渐增大,O沿垂直于表面方向由Al-Si涂层表面向热成形钢基体的迁移量逐渐增大,且迁移的最大深度约为2.80 μm。Fe沿垂直于表面方向由热成形钢基体向Al-Si涂层表面的迁移量直接决定了Fe-Al-Si相的形态、生成位置及界面结合层厚度。随着加热温度的升高,Al-Si涂层表面粗糙度R_a、峰值计数R_pc值先增大后减小;当加热温度为930 ℃时,涂层表面粗糙度R_a达到最大值1.89 μm,峰值计数R_pc值达到最大值218。随着加热温度的升高,Al-Si涂层总厚度从27.78 μm增加至40.46 μm,界面结合层厚度从1.08 μm增加至15.11 μm。当加热温度为930 ℃时,热成形钢基体的硬度达到最大值505 HV0.2。

关键词: 22MnB5热成形钢, Al-Si涂层, 加热温度, 元素迁移, 组织与性能

Abstract: Influence of heating temperature during hot stamping process on microstructure and properties of 22MnB5 hot stamped steel with Al-Si coating was researched by means of roughness meter, scanning electron microscope, hardness tester and glow discharge atomic emission spectrometer, respectively. The results indicate that with the increase of heating temperature, the migration amount of Fe from hot stamped steel substrate to coating surface along the direction perpendicular to surface becomes larger gradually. Meanwhile, the migration amount of O from coating surface to hot stamped steel substrate along the direction perpendicular to surface becomes larger gradually, and the maximum migration depth is about 2.80 μm. The migration amount of Fe from hot stamped steel substrate to Al-Si coating surface along the direction perpendicular to surface directly determines the morphology, formation position of Fe-Al-Si phase and interface bonding layer thickness. As the heating temperature rises, the surface roughness R_a and peak count value R_pc of Al-Si coating increase at first, and then decrease; when the heating temperature is 930 ℃, the surface roughness R_a and peak count value R_pc reach maximum values of 1.89 μm and 218, respectively. With the increase of heating temperature, the total thickness of Al-Si coating increases from 27.78 μm to 40.46 μm, the thickness of interface bonding layer increases from 1.08 μm to 15.11 μm. When heating temperature is 930 ℃, the hardness of the hot stamped steel substrate reaches maximum value of 505 HV0.2.

Key words: 22MnB5 hot stamped steel, Al-Si coating, heating temperature, element migration, microstructure and properties

中图分类号:

TG156

陈忠. 加热温度对Al-Si涂层热成形钢组织及性能的影响[J]. 金属热处理, 2022, 47(10): 228-233.

Chen Zhong. Influence of heating temperature on microstructure and properties of hot stamped steel with Al-Si coating[J]. Heat Treatment of Metals, 2022, 47(10): 228-233.

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