激光热处理对超高强度钢扩孔性能的影响  

Effect of laser heat treatment on hole expansion performance of ultra-high strength steel

作　　者：何琦 徐晨阳 侯泽然 刘亿 仇俊鹏 韩非 闵峻英[1] HE Qi;XU Chen-yang;HOU Ze-ran;LIU Yi;QIU Jun-peng;HAN Fei;MIN Jun-ying(School of Mechanical Engineering,Tongji University,Shanghai 201804,China;Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China;State Key Laboratory of Development and Application Technology of Automotive Steels(BAOSTEEL),Shanghai 201900,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]宝山钢铁股份有限公司研究院,上海201900 [3]汽车用钢开发与应用技术国家重点实验室(宝钢),上海201900

出　　处：《塑性工程学报》2024年第8期225-230,共6页Journal of Plasticity Engineering

基　　金：上海市“科技创新行动计划”项目(21170711200)。

摘　　要：针对DP1180和MS1500两种超高强度钢,采用不同激光工艺参数对拉伸试样进行了激光热处理,通过基于数字图像相关(DIC)技术的单向拉伸实验和显微硬度测试获得激光热处理试样的力学性能并确定了最优激光热处理工艺参数。基于该参数对扩孔试样进行了激光热处理和扩孔实验,研究了激光热处理对两种超高强度钢扩孔性能的影响。结果表明,激光热处理后两种超高强度钢的扩孔性能均显著提升。DP1180在激光功率700 W、扫描速度5 mm·s^(-1)热处理后的扩孔率较基材增加约25.4%。MS1500在激光功率625 W、扫描速度5 mm·s^(-1)热处理后的扩孔率较基材增加约34.4%。For two kinds of ultra-high strength steels,DP1180 and MS1500,the laser heat treatment was carried out for tensile specimens with different laser process parameters,and the mechanical properties of the laser heat treatment specimens were obtained by uniaxial tensile experiments based on digital image correlation(DIC)technology and microhardness tests,and the optimal laser heat treatment process parameters were determined.Laser heat treatment and hole expansion experiments were carried out for hole expansion specimens based on the optimal process parameters,and the effects of laser heat treatment on the hole expansion performance of the two kinds of ultra-high strength steels were studied.The results show that the hole expansion performance of the two kinds of ultra-high strength steels are improved,the hole expansion rate of DP1180 after laser heat treatment with laser power of 700 W and scanning speed of 5 mm·s^(-1) is increased by about 25.4%compared with that of the base material.The hole expansion rate of MS1500 after laser heat treatment with laser power of 625 W and scanning speed of 5 mm·s^(-1) is increased by about 34.4%compared with that of the base material.

关 键 词：激光热处理 超高强度钢 扩孔 局部成形性能 

分 类 号：TG156.9[金属学及工艺—热处理]