激光熔覆涂层在多冲载荷下的力学行为分析

根据多次冲击载荷的特性，从应力波传播、多冲磨损、多冲硬化与软化和多冲塑性变形方面，对带有激光熔覆层试样在多冲冲击载荷下的部分力学行为进行了试验研究。结果表明：在多冲载荷作用下，应力波在涂层和基体的；台金接合面发生反射，形成拉伸波造成涂层的纵裂和角裂；在涂层表面由于应力集中，涂层表面发生微观点蚀和深层剥落；冲击载荷能量的积累．造成涂层试样硬度变化和塑性变形。

Mechanics behavior analysis of laser melted clad coating under repeated impact load

In accordance with the characteristics of repeated impact load, and from the aspects of stress wave transmission, repeated impact wear, hardening and softening of repeated impact and plastic deformation of repeated impact, an experimental study on partial mechanics behaviors of samples bearing laser melted clad coating under repeated impact load was carried out. The result shows that under the effect of repeated impact load, the stress wave produces reflection in the metallurgical junction plane between coating and basal body, and forms stretch wave causing longitudinal split and angle split of coat; the microcosmic spot pitting and deep layered peeling off occur in coating surface due to stress concentration; the energy accumulation of impact loading causes rigidity variation and plastic deformation.