C36000注塑模具铜芯失效分析

C36000 Injection Mold Copper Core Failure Analysis

摘要:

采用直读光谱仪、场发射扫描电镜、维氏硬度仪、金相显微镜等，对C36000注塑模具铜芯的失效件和正常件进行试验对比。结果表明：失效件和正常件的Cu、Pb含量均低于标准值，失效件和正常件的金相组织基本一致，失效件的维氏硬度值高于正常件；EDS微区成分分析发现，晶界部位出现Pb元素偏聚现象，失效件的断口部位呈现“冰糖状”形貌，为脆性断裂特征。

Abstract:

A comparison test was carried out on the failed and normal parts of the C36000 injection mold copper core using instruments such as a direct-reading spectrometer， field emission scanning electron microscope， Vickers hardness tester， and metallographic microscope， etc. The results show that the Cu and Pb contents in both the failed and normal parts are lower than the standard values. The metallographic structures of the failed and normal parts are basically the same. The Vickers hardness value of the failed parts is higher than that of the normal parts. The EDS micro-area composition analysis found that there is a phenomenon of lead element segregation at the grain boundary of the failed parts. The fracture surface of the failed parts shows a "sugar-like" morphology， which is a characteristic of brittle fracture.