基于动态碳配分机制的高强塑积热成形钢研究  

Development of Hot-Stamping Steel with Large Product of Strength and Elongation Based on Dynamic Carbon Partitioning Mechanism

作　　者：彭良贵[1] 刘伟杰[2] 刘相华[1,2] 支颖[1] 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [2]东北大学研究院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2015年第8期1110-1114,1119,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51034009);中央高校基本科研业务费专项资金资助项目(N130407007)

摘　　要：通过直接淬火、Q&P、回火等工艺对一种低碳含铜钢进行热处理,并使用拉伸试验机、落锤冲击试验机、扫描电镜、电子探针、X射线衍射、透射电镜等手段对其力学性能、显微组织和冲击性能进行表征.在连续冷却淬火过程中观察到碳在马氏体和残余奥氏体间的动态配分现象,Q&P处理和低温回火可改善实验钢的冲击韧性;实验钢综合力学性能良好:强塑积大于20 GPa%,抗拉强度超过1 400 MPa,延伸率约14%,室温冲击功高于40 J.结果表明,所开发的实验钢可以满足热冲压工艺对成形淬火一体化的要求,可作为具有高强塑积的热成形用钢.A low-carbon steel with Cu addition was heat-treated by direct quenching, Q＆P （quenching and partitioning ） and tempering processes. The mechanical properties and impact toughness of the test steel were investigated by universal testing machine and drop weight impact testing machine. The microstructure was characterized by SEM （scan electron microscope ）, EPMA （electron probe microanalysis）, XRD （X-ray diffraction） and TEM （transmission electron microscope）. The results show that the phenomenon of dynamic carbon partitioning from martensite to retained austenite in the continuous cooling process is observed and the impact toughness of test steel is improved by Q＆P process and tempering process. The test steel has a good comprehensive mechanical properties： the product of tensile strength and elongation, the tensile strength, the total elongation and the impact toughness at room temperature are 20 GPa% , 1 400 MPa, 14% and 40 J, respectively. The test steel based on dynamic carbon partitioning mechanism can meet the requirement of hot-stamping process and can be used as an excellent hot stamping steel with high product of strength and elongation.

关 键 词：动态碳配分 残余奥氏体 热成形 强塑积 冲击韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]