CP800高强钢高速激光焊接接头组织与性能研究  

Study on the microstructures and properties of high speed laser welded joints of CP800 high strength steel

作　　者：姜彤 王大锋 邹升光 曾浩林 马冰[1] 陈东高[1] Jiang Tong;Wang Dafeng;Zou Shengguang;Zeng Haolin;Ma Bing;Chen Donggao(Ningbo Branch of China Ordnance Research Institute,Ningbo 315103,Zhejiang,China)

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103

出　　处：《钢铁钒钛》2024年第3期182-187,共6页Iron Steel Vanadium Titanium

基　　金：宁波市科技攻关计划项目(2022Z073);宁波市重点研发计划项目(2023Z098);内蒙古自治区自然科学基金项目(2023MS05040);中国兵器工业集团第五二研究所优秀青年科技人才培养基金项目(YQJJ2023-04);中国兵器工业集团第五二所所列基金(NBFJ2022-07)。

摘　　要：为了进一步提高激光焊接速度,改善高速焊接过程中焊缝凹陷的问题,对CP800高强钢进行了12 m/min的高速激光焊接,研究了激光入射角对焊缝成形的影响。在最优焊接工艺参数下,对焊缝成形、焊缝质量、焊接接头组织、硬度及力学性能进行了研究。结果表明:当激光入射角度为+10°时,焊缝表面基本无飞溅,凹陷最小。此外在激光功率为12500 W,焊接速度为12 m/min,激光入射角为+10°的最佳焊接参数下,焊缝表面及内部质量较好,焊缝熔宽约为1.15 mm,热影响区宽度约为0.35 mm。焊缝组织中,主要存在的是板条状马氏体和针状铁素体以及极少量的粒状贝氏体。焊缝的显微硬度(HV)值在402.5~408.5。焊接接头抗拉强度能够达到母材抗拉强度的96%,焊接接头室温冲击功能够达到母材室温冲击功的87.5%。In order to further improve the laser welding speed and solve the problem of weld depression in the process of high speed welding,carried out high speed laser welding of CP800 high strength steel was carried out at 12 m/min,and the influence of laser incidence angle on weld forming was studied.Under the optimal welding process parameters,the weld forming,weld quality,weld joint structure,hardness and mechanical properties were studied.The results show that when the laser incidence angle is+10°,there is basically no spatter on the surface of the weld,and the depression is minimal.In addition,under the optimal welding parameters of 12500 W laser power,12 m/min welding speed and laser incidence angle of+10°,the surface and internal quality of the weld are better,the weld melt width is about 1.15 mm,and the width of the heat-affected zone is about 0.35 mm.Weld structure mainly consists of lathed martensitic,acicular ferrite and slight granular bainite.The measured hardness(HV)in weld ranges 402.5~408.5.The tensile strength and impact energy at room temperature of weld joint can achieve 96%and 87.5%of those of base metal respectively.

关 键 词：CP800高强钢 高速激光焊 激光入射角 显微组织 力学性能 

分 类 号：TF76[冶金工程—钢铁冶金] TG456[金属学及工艺—焊接]