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Effect of Prior Austenite Grain Size on Impact Toughness of Press Hardened Steel

机译:先前奥氏体晶粒尺寸对压力钢冲击韧性的影响

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Impact toughness (or resistance to fracture) is a key material property for press hardened steel used in construction of the safety-critical elements of automotive body structures. Prior austenite grain size, as primarily controlled by the incoming microstructure and austenitization process, is a key microstructural feature that influences the impact toughness of press hardened steel. In this paper, a special Charpy V-notch impact test is developed to quantify the impact toughness of press hardened steel sheets with various prior austenite grain sizes, by stacking a number of thin sheets via mechanical riveting. Both the ductile-to-brittle transition temperature and upper shelf energy are analyzed in an effort to establish a correlation between impact toughness and prior austenite grain size. Within tested conditions, impact performance shows only a slight decrease as the prior austenitic grain size increases from 18 to 38 microns. On the other hand, grain refinement via micro-alloying in the new 1.8 GPa press hardening steel can significantly increase the impact toughness.
机译:冲击韧性(或抗骨折抗性)是用于压制硬化钢的关键材料性能,用于构建汽车体结构的安全关键元件。主要由进入的微观结构和奥氏体化方法控制的先前奥氏体晶粒尺寸是影响压力硬化钢的冲击韧性的关键微观结构特征。在本文中,开发了一种特殊的Charpy V-Notch冲击试验,以通过机械铆接堆叠多个薄片,量化各种先前奥氏体晶粒尺寸的压力硬化钢板的冲击韧性。分析了延性到脆性转变温度和上架能量,以努力建立冲击韧性和先前奥氏体晶粒尺寸之间的相关性。在经过测试的条件下,由于先前的奥氏体晶粒尺寸从18〜38微米增加,冲击性能仅显示轻微的减少。另一方面,通过微合金化在新的1.8 GPA压力机硬化钢中通过微合金化的晶粒细化可以显着增加冲击韧性。

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