摘要
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等方面对激光熔覆层试样进行了试验研究。结果表明:在多冲载荷作用下,应力波在涂层和基体的冶金接合面发生反射,形成拉伸波造成涂层的纵裂和角裂;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。
Based on the feature of repeated impact load, from stress wave spread, impact wear, impact hardening and softening and impact plastic deformation, the mechanical behavior of laser cladding samples under repeated impact load was studied. Results show that under the repeated impact load, stress wave reflected in the metallurgical joint surface between coating and substrate, forming stretch wave, causing coating slitting and angle splitting. Because of stress concentration, coating surface suffered micropit failure and deep delamination. Impact load energy accumulating caused hardness change and plastic defoamation.
出处
《机械工程材料》
CAS
CSCD
北大核心
2005年第1期52-55,共4页
Materials For Mechanical Engineering
基金
湖南省自然科学基金资助项目(02JJY2072)
关键词
多冲载荷
激光熔覆涂层
力学行为
repeated impacting load
laser cladding
mechanical behavior
