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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Tool Temperature on Microstructure and Properties of Tailored Hot Stamping Components
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Effect of Tool Temperature on Microstructure and Properties of Tailored Hot Stamping Components

机译：刀具温度对定制烫印组件微观结构和性能的影响

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摘要

Traditional boron steel hot stamping technology can achieve components with full martensite and tensile strength of 1500?MPa. However, fully martensitic hot stamped components exhibit very low level of ductility and are rarely used in energy absorbing structures. Hot stamping with segmented heating and cooling tool can obtain multiphase quenched structures and the tailored mechanical properties. Hot stamping experiment of U-shape component was performed with segmented heating and cooling tool. Mechanical properties of the formed component were measured, and scanning electron microscope and color tint etching were used to quantify the quenched phases achieved under different tool temperatures. The results showed that hardness value decreased from 470 to 230?HV and tensile strength reduced about 50% from 1406 to 730?MPa and elongation increased from 4.19 to 10.20% as tool temperatures increased from 25 to 500?°C. Meanwhile, martensite decreased from 85 to 30% and bainite increased from 12 to 55%, and there was also a small increase in ferrite. In order to get the influence of quenched phases on the strength and hardness of tailored hot stamped component, linear fitting optimization was used to establish mathematical models for area fraction of quenched phases and strength and hardness.
机译：传统的硼钢热冲压工艺可以实现全马氏体零件，抗拉强度达到1500？兆帕。然而，完全马氏体热冲压部件的延展性非常低，很少用于能量吸收结构。采用分段加热和冷却工具进行热冲压可以获得多相淬火组织和定制的力学性能。采用分段加热冷却工具对U形件进行了热冲压试验。测量成形部件的机械性能，并使用扫描电子显微镜和着色蚀刻来量化在不同工具温度下获得的淬火相。结果表明，硬度值从470降至230？高压和抗拉强度从1406降低到730？随着工具温度从25℃增加到500℃，MPa和伸长率从4.19%增加到10.20%？°C。同时，马氏体从85%减少到30%，贝氏体从12%增加到55%，铁素体也有少量增加。为了得到淬火相对定制热冲压件强度和硬度的影响，采用线性拟合优化方法建立了淬火相面积分数和强度和硬度的数学模型。

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