摘要
研究了激光熔覆修复15-5PH沉淀硬化不锈钢激光熔覆修复比例(25%、50%、75%、100%)对其力学性能的影响,以及熔覆修复后试样的断口形貌、金相组织、内部缺陷和显微硬度。研究结果表明,15-5PH不同比例熔覆修复试样的抗拉强度均高于基材,但塑性随着修复比例的增大而降低,在所研究的4种熔覆修复比例的试样中,25%熔覆比例时抗拉强度最高,力学性能最好。熔覆修复冶金组织致密,分为修复区、热影响区和基材区,其中热影响区的组织呈现明显的方向性,晶粒均匀性好,无粗大晶粒,表面和内部无裂纹缺陷,显微硬度从修复区向基材区整体呈上升趋势,在热影响区内出现硬度峰值。熔覆界面的结合力较基体内部的结合力弱,修复试样的断口均呈V字形。
The affect of cladding reparation rate（25%, 50%, 75% and 100%） on mechanical property of 15-5PH precipitation hardening stainless steel is studied. Cladding repairing samples are also used for testing fractograph, metallo-graphic structure, internal faws and microstructure hardness. The results show that the tensile strength under different clad-ding reparation rate is higher than the matrix; however its ductility decreases with the increase of cladding reparation rate. Among all the studied samples, the tensile strength and mechanical property reach the peak under 25% cladding reparation rate sample. The metallographic structures of cladding reparation area, heat-affected zone and undamaged matrix is com-pact. Among them, the structure of heat-affected zone shows apparent direction, with refned grains and fawless interface and surface. The microstructure hardness rises from cladding reparation to matrix, with peak value in heat-affected zone. The adhesive force of cladding area is weaker than that of inner matrix. The results show that fractograph of samples all resemble V shape.
出处
《航空制造技术》
2017年第10期86-90,共5页
Aeronautical Manufacturing Technology
关键词
熔覆修复
力学性能
15-5PH
金相组织
Cladding reparation
Mechanical property
15-5PH
Metallurgical structure
