摘要
对20G失效炉管材料裂纹密集区域进行解剖,从不同角度观察裂纹形态,寻找裂纹扩展方式,并对带状组织分布良好区域进行原位拉伸实验后对断口进行分析。通过试验发现,裂纹密集区域内材料球化严重,表面产生多个微小裂纹,并首尾相连。材料内部存在不同程度损伤,裂纹由表面穿过内部损伤区域向纵深扩展。通过质量分数测试发现材料在高温下随服役时间的积累,材料质量分数也会逐渐发生改变,在内部高压作用下使材料局部产生较大塑性变形最终产生失效,并通过ANSYS软件进行模拟,发现裂纹尖端应力集中现象非常明显。
The cracked concentration area of 20G material is anatomized,the cracked condition is observed from different angles and the crack propagation mode is found.Many micro cracks appear in its surface and are connected end to end.The different injury is suffered in the inside of material.Cracks extend from the surface injury to depth.Under the action of high temperature,due to carbon consumption,the plasticity of the material is increased.ANSYS software is used to analyze and simulate the crack extension and it is found that stress concentration phenomenon of the crack tip area is obvious.
出处
《机械制造与自动化》
2017年第4期31-35,共5页
Machine Building & Automation
