摘要
实验室条件下设计了两种不同成分的汽车用高强度双相钢,通过微观组织和力学性能对比分析,确定适合现有退火生产线的成分,并采用奥钢联VAI退火热模拟试验机研究了退火温度对组织和性能的影响。试验结果表明:两种化学成分的试验钢均满足汽车用高强度双相钢的微观组织和力学性能要求,只添加Cr的试验钢可以代替复合添加Cr、Mo的试验钢;随着连续退火温度的升高,只加Cr试验钢的铁素体含量逐渐降低,马氏体含量呈先增加后降低的趋势,屈服强度逐渐上升,抗拉强度和断后伸长率先上升后降低;退火温度为820℃时,试验钢具有优良的综合力学性能,强塑积达到20.04GPa·%。
High strength dual phase steel for automobile with two kinds of chemical compositions was designed.The microstructure and mechanical properties of the steel were compared and analyzed to determine the composition design suitable for the hot-dip galvanized continuous annealing production line.The influence of the annealing temperature temperature on the microstructure and mechanical properties was studied by using the VAI thermal simulation tester.The test results show that the test steels designed by two kinds of chemical components meet the microstructure and mechanical performance requirements of high strength dual phase steel.The test steel with Cr added alone can replace the test steel with Cr and Mo added.With the increase of annealing temperature in the dual phase zone,the volume fraction of ferrite decreased gradually,the volume fraction of martensite increased gradually and then decreased gradually,and the yield strength gradually increased,the tensile strength and the elongation rate gradually increased and then gradually decreased.The test steel had good comprehensive mechanical properties at annealing temperature of 820℃,the product of strength and ductility was 20.04 GPa·%.
作者
李春诚
陈宇
杨波
李科龙
姜乐朋
LI Chuncheng;CHEN Yu;YANG Bo;LI Kelong;JIANG Lepeng(Technical Center of Ben Gang Group Corporation,Benxi 117000,Liaoning,China;National and Local Joint Engineering Laboratory of Advanced Automotive Steel Development and Application Technology,Benxi 117000,Liaoning,China)
基金
NSFC-辽宁联合基金(U1908224)
辽宁省“百千万人才工程”项目(辽人社函[2021]79号A类项目21号)
辽宁省“兴辽英才计划”(XLYC2007066)。
关键词
高强度
双相钢
汽车钢
退火温度
high strength
dual phase steel
automotive steel
annealing temperature
