摘要
为了研究激光熔覆工艺参数对熔覆层宏观形貌和气孔缺陷的影响,通过设计正交试验,分析了优化参数下熔覆层的微观组织和力学性能。试验结果显示,随着扫描速度增加,气孔数量和熔覆层厚度减小;当熔覆层厚度小于200μm时,Ar气卷入熔融金属形成的气泡能够及时逸出,使得气孔数量降低;在激光功率1 300 W、送粉速度28 g/min、扫描速度7 mm/s的熔覆工艺参数下,能够获得无裂纹和无气孔的熔覆层,其微观组织由大量的针状马氏体和少量的碳化物组成,显微硬度值约为650HV_(0.5)~710HV_(0.5)。研究表明,扫描速度对气孔数量和熔覆层有着显著影响。
In order to study the effect of laser cladding process parameters on the macroscopic morphology and pore defects of the cladding layer, the microstructure and mechanical properties of the cladding layer under optimized parameters were analyzed by orthogonal design test. The experimental results show that the number of pores and the thickness of cladding layer decrease with the increase of scanning speed. When the thickness of the cladding layer is less than 200 μm, the bubbles formed by the Ar gas involved in the molten metal can escape in time, resulting in the reduction of the number of pores. Under the cladding process parameters of laser power 1 300 W, powder feeding speed 28 g/min and scanning speed 7 mm/s, the cladding layer without cracks and pores can be obtained. The microstructure of the cladding layer is composed of a large number of acicular martensite and a small amount of carbide, and the microhardness is about 650HV_(0.5)~710HV_(0.5). The results show that the scanning speed has a significant effect on the number of pores and the cladding layer.
作者
李涛
张世通
高晓龙
刘晶
张柯
余浩魁
LI Tao;ZHANG Shitong;GAO Xiaolong;LIU Jing;ZHANG Ke;YU Haokui(School of Mechanical Engineering,Baoji University of Arts and Sciences,Baoji 721016,Shaanxi,China;Shaanxi Province Key Laboratory ofAdvanced Manufacturing and Detection Technology for Industrial Robot and Its Mojor Component,Baoji 721016,Shaanxi,China)
出处
《焊管》
2022年第10期24-29,共6页
Welded Pipe and Tube
基金
国家自然科学基金“钛/钢异种金属超声辅助双光束激光熔焊-熔钎焊双界面调控及成形机制研究”(51905006)
陕西省重点研发计划一般项目“航空航海用钛合金大厚板高速高质超声辅助激光填丝焊关键技术及设备研发”(2021GY-322)
陕西省教育厅专项科研计划项目“共晶合金凝固组织非平衡性与组织演化关联性研究”(No.19JK0037)
宝鸡文理学院研究生创新项目“Ti6Al4V/V/NiTi异种金属激光焊接技术研究”(YJSCX20YB09)。
