摘要
针对TC4钛合金锻件误加工造成的铣槽和面尺寸超差进行了激光快速修复研究。修复区与锻件基体之间形成致密冶金结合,修复区组织为柱状原始β晶界内编织细密的α+β网篮组织,晶内α板条的宽度<1μm。修复过程中发现粉末状况、激光加工参数影响到修复区中气孔、层间或道间熔合不良等缺陷的形成,通过采用粉末真空干燥处理、优化工艺参数等方法获得了修复区内无气孔、熔合不良等缺陷的修复试样。修复试样的室温静载拉伸性能测试结果表明,其抗拉强度达到1000MPa,屈服强度达到925MPa,延伸率为8.0%,接近锻件本体性能。
Researches on the laser rapid repair of titanium alloy components having defects mis-machined were investigated. There is a dense metallurgical bond between the repaired zone and the substrate. The microstructures of the repaired zone are primal columnar β grains within which exist α＋β knit structures, specially the platelet width of intercrystalline α is less than 1 μm. It is found that the laser process parameters and the status of powders influence the defects, including gas porosities and lack of fusion among layers etc. Flawless samples were obtained through treating powders and optimizing laser process parameters. The results of repaired sample tensile test at room temperature show that σb is 1000 MPa, σ0.2 is 925 MPa and 8 is 8.0%, approaching to the wrought TC4 alloy.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第11期1817-1821,共5页
Rare Metal Materials and Engineering
基金
国家自然基金重点项目(50335010)
国家自然基金项目(50405038)
西北工业大学英才培养计划(05XE0131)
关键词
TC4钛合金
激光快速修复
微观组织
缺陷
拉伸性能
TC4 titanium alloy
laser rapid repair
microstructures
defects
tensile performance
