Fracture morphologies of a hot stamped steel and comparisons with several sheet metals

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Shu-lin Tan , Kun Yang , Ya-nan Ding , Xian-hong Han
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引用次数: 4

Abstract

Hot stamping has been widely used in car industry to produce safety components. Most existing researches focused on the stamping and quenching process, but less on the mechanical properties of stamped parts. The fracture behaviors of hot stamped boron steel B1500HS have been studied, and other four commonly used sheet metals with different strengths, including Q235, TRIP780, QP980 and MS1300, were also introduced for comparison. Both uniaxial tests and mechanical trimming tests were performed, and the fracture surfaces under different stress states were observed and discussed. The SEM observations showed that the fracture models are closely related to the stress states, i. e., the tensile surfaces have ductile rupture characters while the trimming surfaces have brittle rupture characters. Compared with other steels, the quenched boron steel has smaller dimple size accompanied by shear planes in the tensile surface, and has smaller burnish zone in the trimming surface, and its cutting surface with ‘S’ like shape is also very different with others. Furthermore, two fitted empirical models were derived to describe the quantitative correlations between the average dimple diameter and the steel strength and between the percentage of burnish zone and the steel strength.

热冲压钢的断裂形貌及其与几种薄板金属的比较
热冲压技术已广泛应用于汽车工业生产安全部件。现有的研究大多集中在冲压和淬火工艺上,而对冲压件的力学性能研究较少。对热冲压硼钢B1500HS的断裂行为进行了研究,并对Q235、TRIP780、QP980、MS1300等4种不同强度的常用板材进行了比较。进行了单轴试验和机械切边试验,对不同应力状态下的断口进行了观察和讨论。扫描电镜观察表明,断裂模式与应力状态密切相关,即拉伸表面具有韧性断裂特征,而切边表面具有脆性断裂特征。淬火后的硼钢与其他钢相比,拉伸面伴随剪切面的韧窝尺寸更小,切边面的光亮区更小,其“S”形切削面也与其他钢有很大不同。此外,还建立了两个拟合的经验模型,描述了平均韧窝直径与钢强度之间以及抛光区百分比与钢强度之间的定量相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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