ZTC4激光熔覆修复力学性能及失效分析

Mechanical properties and failure analysis of ZTC4 laser cladding repair

采用同轴送粉式激光熔覆技术对ZTC4板材的圆孔形缺陷进行修复,通过采用封边搭接和旋转搭接的方式研究了不同工艺、不同扫描路径及不同热处理工艺下激光熔覆修复对ZTC4修复件力学性能的影响。结果表明,封边搭接和旋转搭接的修复质量及修复效率相近,能在保证修复效率的情况下保证一定的修复质量。光斑直径相较于修复层数是更主要影响修复质量的工艺参数。对深3 mm和5 mm孔进行封边搭接及旋转修复时,发现采用φ2.5 mm光斑直径的封边搭接工艺所获得的力学性能优于光斑直径φ1.0 mm封边搭接和旋转修复工艺。光斑直径φ2.5 mm封边搭接拉伸结果呈韧性断裂;光斑直径φ1.0 mm封边搭接拉伸结果呈准解理断裂。同时,修复试样的综合力学性能在经过固溶处理和固溶时效处理前后变化不大。

The round hole defect of ZTC4 plate is repaired by coaxial powder feeding laser cladding technology.Laser cladding is studied under different processes,different scanning paths and different heat treatment processes by means of edge bonding and rotating overlap.The effect of repair on the mechanical properties of ZTC4 repair parts.The results show that the repair quality and repair efficiency of the edge-sealing and rotating overlap are similar,and a certain repair quality can be guaranteed while ensuring the repair efficiency.The spot diameter is a process parameter that is more important to the quality of the repair than the number of repair layers.When the deep 3 mm and 5 mm holes were edge-sealed and rotated,it was found that the mechanical properties obtained by the edge-bonding process with φ2.5 mm spot diameter were better than the spot diameter φ1.0 mm edge-sealing and rotation repair process.The spot diameter φ2.5 mm lap joint tensile test results in ductile fracture;the spot diameter φ1.0 mm edge lap joint tensile results are quasi-cleavage fracture.At the same time,the comprehensive mechanical properties of the repaired samples did not change much before and after solution treatment and solution treatment.