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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：传统的硼钢热冲压技术可以实现具有1500°MPA的全马氏体和拉伸强度的部件。然而，完全马氏体烫印组件表现出非常低的延展性水平，并且很少用于能量吸收结构。具有分段加热和冷却工具的热冲压可以获得多相淬火结构和定制的机械性能。用分段加热和冷却工具进行U形成分的热冲压实验。测量所形成的组分的机械性能，并使用扫描电子显微镜和颜色色调蚀刻来量化在不同工具温度下实现的淬火相。结果表明，硬度值从470降低到230℃ΔHV和拉伸强度从1406降低约50％至730℃ΔMPa和伸长率从4.19增加到10.20％，因为刀具温度从25升增加到500℃。同时，马氏体从85％降至30％，贝氏体从12升增加到55％，并且铁氧体也较小。为了使淬火阶段对定制的烫印组分的强度和硬度的影响，使用线性拟合优化来建立淬火阶段和强度和硬度的面积分数的数学模型。

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