激光焊接参数对齿科钛金属接头组织与性能的影响

• 作 者: 徐凤林 王少刚 景建龙 俞青 朱伟进 韩志诚
• 机 构: 南京航空航天大学材料科学与技术学院,南京航空航天大学材料科学与技术学院,南京市口腔医院,南京市口腔医院,南京航空航天大学材料科学与技术学院,南京航空航天大学材料科学与技术学院 江苏南京210016,江
• 出 处: 应用激光
• 发表日期: 2007年01期
• 关键词: 齿科 钛 激光焊 组织 性能

采用电子万能试验机测试钛金属激光焊接头的力学性能。结果表明,随着激光光斑直径的减小或功率的增加,接头熔深增加,强度提高;并且随着激光功率密度的增大,接头强度呈增大趋势。进一步从激光功率密度的角度分析,光斑直径比激光功率对接头强度的影响更大,激光光斑直径为0.7mm、功率1.6kW时,获得接头性能较佳。金相组织观察显示,接头组织致密,未发现有夹杂和微裂纹等缺陷,接头拉伸断口呈韧性断裂特征,断裂区有大量的韧窝存在。

Tensile properties of titanium metal laser welded joints were tested by electronic universal testing machine. The results show that as the laser spot diameter decreases or the power increases, the joint penetration increases and the strength increases. With the increase of laser power density, the joint strength increases. Further from the laser power density point of view, the spot diameter than the laser power on the strength of the joint greater, the laser spot diameter of 0.7mm, power 1.6kW get better joint performance. Metallographic observation showed that the joints were dense and no defects such as inclusions and micro-cracks were found. Tensile fracture of the joint was characterized by ductile fracture. There were a large number of dimples in the fracture zone.