高铝双相钢HC420/780DP的烘烤硬化特性  

Bake hardening characteristics of high aluminum dual phase steel HC420/780DP

作　　者：王淑华 艾兵权 田秀刚 逯志强 王海龙 王玉慧 Wang Shuhua;Ai Bingquan;Tian Xiugang;Lu Zhiqiang;Wang Hailong;Wang Yuhui(Technology Center,Tangshan Iron and Steel Group Co.,Ltd.,Tangshan Hebei 063016,China;Quality Management Department,Tangshan Iron and Steel Group Co.,Ltd.,Tangshan Hebei 063016,China)

机构地区：[1]河钢集团唐钢公司技术中心,河北唐山063016 [2]河钢集团唐钢公司质量管理部,河北唐山063016

出　　处：《金属热处理》2023年第12期180-183,共4页Heat Treatment of Metals

摘　　要：研究了预应变量对高铝双相钢HC420/780DP烘烤硬化值和显微组织的影响。对高铝双相钢HC420/780DP分别施加0%、2%、4%、6%、8%、12%预应变再经170℃×20 min烘烤硬化处理后,测定烘烤硬化值,并结合OM、SEM、XRD等分析手段对不同预应变量的试样进行检测分析。结果表明,烘烤硬化值的大小与位错密度的高低有直接关系。随着预应变量的增加,位错密度不断增加,马氏体含量增加,烘烤硬化值也随之增加。当预应变量≤2%时,位错密度较小,烘烤硬化值不足30 MPa。预应变量达到8%时,位错密度最大,约0.208 m^(-2),烘烤硬化值达到38 MPa。当预应变量≥8%时,位错密度保持不变,烘烤硬化值继续增大,最高可达72 MPa。XRD结果表明,不同预应变量烘烤前后均没有发现残留奥氏体。Effect of prestrain on the bake hardening value and microstructure of high aluminum dual phase steel HC420/780DP was studied.After prestraining the high aluminum dual phase steel HC420/780DP at 0%,2%,4%,6%,8%and 12%respectively,and then bake hardened at 170℃for 20 min,the bake hardening value was measured,and the specimens with different prestrains were detected and analyzed by means of OM,SEM,XRD and other analysis methods.The results indicate that the bake hardening value is directly related to the density of dislocations.As the prestrain increases,the dislocation density continuously increases,the martensite content increases,and the bake hardening value also increases.When the prestrain is≤2%,the dislocation density is small,and the bake hardening value is less than 30 MPa.When the prestrain reaches 8%,the dislocation density is the largest,about 0.208 m^(-2),and the bake hardening value reaches 38 MPa.When the prestrain is≥8%,the dislocation density remains unchanged,but the bake hardening value continues to increase,reaching a maximum of 72 MPa.The XRD results show that no retained austenite is found before and after baking under different prestrains.

关 键 词：冷轧双相钢 烘烤硬化 预应变量 柯氏气团 

分 类 号：TG142.1[一般工业技术—材料科学与工程]