中国机械工程2016，Vol.27Issue(24)：3382-3388,7.DOI:10.3969/j.issn.1004-132X.2016.24.020
高氮钢复合焊接接头组织与力学性能研究
Study on Welded Joint Microstructure and Mechanics Properties of High Nitrogen Steels for Laser-arc Hybrid Welding
摘要
Abstract
Heat input had a significant effect on microstructure and mechanics properties of wel-ded j oint.The j oint microstructure,weld nitrogen content,tensile and impacted properties and the micro hardness of j oint were studied by laser-arc hybrid welding while the arc and laser energy were different.The results show that the weld microstructure is made up of austenite and a small amount ofδferrite.The delta ferrite deposited from weld is increased by the increasing heat input.After the cur-rent reaches 200 A,the dissolution of nitrogen in liquid metal molten pool is close to saturation;and even if the welding current is added,the weld nitrogen content still tends to be constant.When the la-ser power is increased to 2.0 kW,keyhole remains at a stable state in the welding processes,and weld nitrogen content is approximate to constant.Tensile fracture location is in the weld zone.When the welding current is as 200 A,the highest average tensile strength reaches 967.58 MPa.When laser power is as 1.6 kW,the average tensile strength may reach 962.88 MPa.The weld impact energy shows a first decrease and then increase with increasing laser power,but the variation tendency is op-posite along with increasing current.The variation tendency of impact energy of the weld fusion line is the same as that of the weld zone and changes with the welding parameters.The highest average im-pact energy of the weld and the weld fusion line are as 47.60 J and 62.85 J separately.All tensile and impacted fracture mode is of ductile fracture.The micro hardness of weld area is lowest so that the fracture area of tensile test is located at the weld zone.关键词
激光/电弧复合焊接/高氮钢/显微组织/力学性能Key words
laser-arc hybrid welding/high nitrogen steel/microstructure/mechanics property分类
矿业与冶金引用本文复制引用
王力锋,刘凤德,刘双宇,张宏,刘薇娜,田淼磊..高氮钢复合焊接接头组织与力学性能研究[J].中国机械工程,2016,27(24):3382-3388,7.基金项目
国家自然科学基金资助项目(51305044) （51305044）
