TIG填丝+激光熔凝模具修复工艺分析

The property of die-casting dies repaired by manual TIG filler wire coupling laser melting

关键词:  压铸模具  TIG手工填丝  激光熔凝  热疲劳  摩擦磨损

Key words:  die-casting dies  manual TIG filler wire  laser melting  thermal fatigue properties  wear properties

摘要:

针对失效模具TIG手工填丝工艺修复区域出现的强度不足等问题，提出了TIG手工填丝+激光熔凝模具修复方法,并通过扫描电镜(SEM)、X射线衍射分析(XRD)、硬度测试、热疲劳裂纹阻断试验、摩擦磨损试验一系列测试手段，分析激光熔凝对TIG手工填丝修复层的强化性能. 结果表明，激光熔凝能够有效细化TIG修复层表层组织，减小组织内应力，提高组织塑性和韧性，使得修复区的抗热疲劳性能得到大幅度的提升. 高温滑动磨损条件下，TIG填丝+激光熔凝复合修复试样表面摩擦系数小，磨损量相比于TIG试样减少了30%，表现出了优良的耐磨性能.

Abstract:

In order to solve the problem of insufficient strength of die-casting repaired by manual TIG filler wire, the method of manual TIG filler wire coupling laser melting was proposed. The intensifying effect of laser melting on manual TIG filler wire repair-layer was analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD), microhardness test, thermal fatigue crack blocking test and wear test in this paper. The experiment results indicated that the microstructure of the repair-layer processed with manual TIG filler wire coupling laser melting was refined significantly compared with that processed by manual TIG filler wire. The thermal fatigue property of the composite repair-layer was improved obviously. Moreover, the composite repair-layer had excellent wear resistance under high-temperature sliding wear test condition.