Abstract To widen the application of the fine-blanking process, the heat-assisted fine-blanking process for 304 stainless steel plate has been conducted. The quality of the sheared surface and the hardness distribution of the deformed part were studied to determine the influence of the forming condition on forming results and the performance of the deformed part. Furthermore, electron backscatter diffraction and X-ray diffraction analyses were conducted to study the microstructure evolution and phase transformation of the deformed part for determining their forming mechanism and underlying reasons for their hardness distribution. The quality of the sheared surface improved with an increase in the forming temperature. When the temperature was increased to 250 °C, a sheared surface with a full burnish zone was obtained for a linear segment. Moreover, the forming temperature not only affected the hardness value of the deformed part, which reduced with an increase in the forming temperature, but also affected the hardness distribution. The experimental results indicated that the “hardness-affected zone” decreased in size with an increase in the forming temperature. Through microstructure and dislocation density analysis, changes in the quality of the sheared surface and hardness of the heat-assisted fine-blanked 304 stainless steel part could be attributed to the variation in the martensite content and dislocation density of deformed part, both of which decreased with increasing forming temperature.

中文翻译：

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304不锈钢板热辅助精冲工艺的成型性

摘要 为扩大精冲工艺的应用，开展了304不锈钢板热辅助精冲工艺。研究了变形件的剪切面质量和硬度分布，以确定成形条件对成形结果和变形件性能的影响。此外，还进行了电子背散射衍射和 X 射线衍射分析，以研究变形零件的微观结构演变和相变，以确定其形成机制和硬度分布的根本原因。剪切面的质量随着成型温度的升高而提高。当温度升高到 250 °C 时，获得了具有完整抛光区的线性段的剪切表面。而且，成形温度不仅影响变形件的硬度值，随成形温度升高而降低，而且影响硬度分布。实验结果表明，随着成形温度的升高，“硬度影响区”的尺寸减小。通过显微组织和位错密度分析，热辅助精冲304不锈钢零件的剪切面质量和硬度的变化可归因于变形零件马氏体含量和位错密度的变化，两者均降低随着成型温度的升高。实验结果表明，随着成形温度的升高，“硬度影响区”的尺寸减小。通过显微组织和位错密度分析，热辅助精冲304不锈钢零件的剪切面质量和硬度的变化可归因于变形零件马氏体含量和位错密度的变化，两者均降低随着成型温度的升高。实验结果表明，随着成形温度的升高，“硬度影响区”的尺寸减小。通过显微组织和位错密度分析，热辅助精冲304不锈钢零件的剪切面质量和硬度的变化可归因于变形零件马氏体含量和位错密度的变化，两者均降低随着成型温度的升高。