热成形钢极限冷弯性能及零件碰撞断裂指数关系研究Research on the Relationship Between Bending Angles of Press Hardening Steel and Crash Cracking Index of Hot Stamping Parts
路洪洲,范体强,方刚,冯毅,王建锋,崔磊
摘要(Abstract)：
采用了3种同厚度、不同成分及工艺的铝硅镀层热成形钢制造热冲压成形零部件，并进行零件的落锤冲击测试评价，采用碰撞断裂指数C_(Index)分析3种材料制备的零件抗开裂能力，并分析了C_(Index)与材料本身相关力学性能的关系，发现，随着热成形钢的极限尖冷弯角度增大，C_(Index)值显著提高，而C_(Index)值与热成形钢的强度和延伸率没有显著的关联。分析了热成形钢的极限尖冷弯失效的机理，铌微合金化提升了热成形钢极限尖冷弯角度，进而提升了热冲压成形零件的抗碰撞开裂能力。
关键词(KeyWords)： 热成形钢;热冲压成形零件;铌;极限尖冷弯角度;碰撞断裂指数
基金项目(Foundation):
作者(Author): 路洪洲,范体强,方刚,冯毅,王建锋,崔磊
DOI: 10.19710/J.cnki.1003-8817.20220152
参考文献(References)：
- [1]《世界汽车车身技术及轻量化技术发展跟踪研究》编委会.世界汽车车身技术及轻量化技术发展跟踪研究[M].北京：北京理工大学出版社，2018.
- [2] KURZ T, LAROUR P, LACKNER J, et al. Press-hardening of zinc coated steel-characterization of a new material for a new process[C]//IDDRG2016 conference on"Challenges in Forming High-Strength sheets", IOP Conf. Series:Materials Science and Engineering,2016(159):012025.
- [3] JUNYA N, TOSHIO M, SHIGEO O. Correlation between Side Impact Crash Behavior of Hot-stamping Parts and Mechanical Properties of Steel[J]. KOBE STEEL ENGINEERING REPORTS,2017, 66(2):69-75.
- [4] JEAN, LEMAITRE. Damage measurements[J]. Engineering Fracture Mechanics, 1987, 28(5-6):643-661.
- [5] Lievers, W B. The co-operative role of voids and shear bands in strain localization during bending[J]. Mechanics of Materials, 2003. 35(7):661-674.
- [6] SCHWELLINGER, P. On the mechanism of ductile intergranular fracture in AL Mg SI alloys[J]. Scripta Metallurgica, 1978. 12(10):899-901.
- [7] REUSCH FREDERIK. Entwicklung und Anwendung eines nicht-lokalen Materialmodells zur Simulation duktiler Sch?digung in metallischen Werkstoffen[D]. Berlin:Universit?t Dortmund, 2003.
- [8] J MEYA R, KUSCHE C, L?BBE, C, et al. Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States[J]. Metals-Open Access Metallurgy Journal, 2019, 9(3):319.