激光热处理对超高强度钢弯曲性能的影响  

Effect of laser heat treatment on bending properties of ultra-high strength steel

作　　者：杨雨诗 何琦 徐晨阳 韩非[2,3] 刘亿 侯泽然 闵峻英 Yang Yushi;He Qi;Xu ChenYang;Han Fei;Liu Yi;Hou Zeran;Min Junying(School of Mechanical Engineering,Tongji University,Shanghai 201804,China;Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201999,China;State Key Laboratory of Development and Application Technology of Automotive Steels(BAOSTEEL),Shanghai 201999,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中央研究院,上海201999 [3]汽车用钢开发与应用技术国家重点实验室(宝钢),上海201999

出　　处：《锻压技术》2024年第7期97-104,共8页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52105395)。

摘　　要：根据激光热处理技术能够有效地改善超高强度钢的成形性能、实现超高强度钢弯曲韧性提升的特点,以超高强度钢DP1180为研究对象,通过三点尖冷弯实验表征了DP1180超高强度钢板的弯曲性能,研究了激光热处理对其局部成形性能的影响。结果表明,激光热处理后DP1180超高强度钢板的成形性能显著提升,极限冷弯角较基材提升了约25.7%。结合显微硬度分布和微观组织观察结果对微观组织的演化规律进行了分析,从马氏体转变为回火马氏体的材料相变角度揭示了激光热处理对DP1180超高强度钢弯曲性能的影响机理。研究结果为激光热处理技术提升超高强度钢弯曲性能的工程应用提供了实验依据和理论参考。According to the characteristics that laser heat treatment technology can effectively improve the formability and the bending toughness of ultra-high strength steel.Therefore,for ultra-high strength steel DP1180,the bending performance of ultra-high strength steel DP1180 plates was characterized by three-point-tip cold bending experiments,and the influence of laser heat treatment on local formability was studied.The results show that the formability of ultra-high strength steel DP1180 plates after laser heat treatment is significantly improved,and the ultimate cold bending angle is improved by about 25.7%compared with the base material.Combining microhardness distribution and microstructure observation result,the evolution law of microstructure is analyzed,and the influence mechanism of laser heat treatment on the bending performance of ultra-high strength steel DP1180 is revealed from the perspective of martensite transformation to tempered martensite.Thus,this research result provides experimental evidence and theoretical references for the engineering application of laser heat treatment technology to enhance the bending performance of ultra-high strength steel.

关 键 词：激光热处理 超高强度钢 弯曲性能 三点尖冷弯 极限冷弯角 

分 类 号：TG156.3[金属学及工艺—热处理]