激光功率对激光-电阻复合熔覆630不锈钢丝材修复层组织及性能的影响

Effect of Laser Power on Microstructure and Properties of Laser-resistance Composite Cladding 630 Stainless Steel Wire Repair Layer

为了解决机械零件的修复再制造问题,本文采用“激光-电阻复合丝材熔覆”的方法进行工艺研究。使用“激光-电阻复合丝材熔覆”的方法对机械零件进行再制造及其工艺研究。在45号钢表面进行不同激光功率下的多道630不锈钢丝材激光-电阻复合熔覆试验,并对不同激光功率下的多道修复层宏观形貌、微观组织、显微硬度和耐磨损性能进行对比分析。结果表明:随着激光功率的增大,修复层表面平整度变高,且与基体的结合层逐渐变得平滑,两者之间出现了明显的分界线。修复层晶粒随着激光功率的增加逐渐细化。此外,修复层显微硬度逐渐增加,激光功率3000 W时的修复层平均显微硬度为激光功率1800 W时的1.16倍。当激光功率为3000 W时,修复层耐磨损性能最优,其主要磨损形式为磨粒磨损和轻微的黏着磨损。

To solve the problem of repairing and remanufacturing for the mechanical parts,the new process method“laser-resistance composite wire cladding”is used for process research in this study.The laser-resistance composite cladding experiments of multi-channel 630 stainless steel wire under different laser powers were carried out on the surface of No.45 steel.The macro morphology,microstructure,microhardness,and wear resistance of the multi-channel repair layer under different laser powers were compared and analyzed.Results show that with the increase of laser power,the surface smoothness of the repaired layer is higher,and the bonding layer with the substrate gradually becomes smooth.Meanwhile,there is an obvious boundary between the repaired layer and the bonding layer.The grain size of the repaired layer gradually refined is increased with the increasing of laser power.Furthermore,the microhardness of the repaired layer gradually is increased while increasing the laser power.When the laser power is 3000 W,the average microhardness is 1.16 times higher than that when the laser power is 1800 W.Moreover,the wear resistance of the repaired layer is the highest when the laser power is 3000 W,where the primary wear forms are abrasive wear and slight adhesive wear.