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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Plastic Deformation on Martensitic Transformation During Hot Stamping of Complex Structure Auto Parts
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Influence of Plastic Deformation on Martensitic Transformation During Hot Stamping of Complex Structure Auto Parts

机译：塑性变形对复杂结构汽车零件热冲压过程中马氏体变形的影响

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摘要

The ultra-high strength steel auto parts manufactured by hot stamping are widely applied for weight reduction and safety improvement. During the hot stamping process, hot forming and quenching are performed in one step wherein plastic deformation and phase transformation simultaneously take place and affect each other. Thereinto, the influence of deformation on martensitic transformation is of great importance. In the present paper, the influence of plastic deformation on martensitic transformation during hot stamping of complex structure auto parts was investigated. For this purpose, a B-pillar reinforced panel in B1500HS steel was manufactured by hot stamping, and the process was simulated by finite element software based on a thermo-mechanical-metallurgical coupled model. Considering various deformation degrees, the microstructures and mechanical properties at four typical locations of the hot stamped B-pillar reinforced panel were detected. The results show that the martensitic content and the microhardness increase with the increase in the deformation amount. There are two reasons causing this phenomenon: (1) the increase in mechanical driving force and (2) the increased probability of the martensitic nucleation at crystal defects. The x-ray diffraction analysis indicates the carbon enrichment in retained austenite which results from the carbon diffusion during the low-carbon martensite formation. Furthermore, the carbon content decreases with the increase in the deformation amount, because the deformation of austenite suppresses the carbon diffusion.
机译：通过热冲压制造的超高强度钢自动零件广泛应用于减轻重量和安全性。在热冲压过程中，在一个步骤中进行热成型和淬火，其中塑性变形和相变同时发生并彼此影响。其中，变形对马氏体转化的影响非常重要。本文研究了复杂结构汽车零件热冲压期间塑性变形对马氏体变换的影响。为此目的，通过热冲压制造B1500HS钢中的B柱加强面板，通过基于热机械冶金耦合模型的有限元软件模拟该过程。考虑到各种变形度，检测到热冲压B柱增强板的四个典型位置处的微观结构和机械性能。结果表明，马氏体含量和微硬度随着变形量的增加而增加。导致这种现象有两个原因：（1）机械驱动力的增加和（2）晶体缺陷的马氏体成核的概率增加。 X射线衍射分析表明保留奥氏体中的碳富集，其由低碳马氏体形成期间的碳扩散产生。此外，碳含量随着变形量的增加而降低，因为奥氏体的变形抑制了碳扩散。

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