灰铸铁配重的断裂原因分析  

Analysis on Fracture Cause of Gray Cast Iron Counterweight

作　　者：冯银平 刘耀辉 刘岩 魏彩丽 FENG Yinping;LIU Yaohui;LIU Yan;WEI Caili(Luoyang Key Laboratory of Mechanical Product Failure Analysis,Manufacturing Engineering Center,First Tractor Company Limited,Luoyang 471004,China)

机构地区：[1]第一拖拉机股份有限公司制造工程中心洛阳市机械产品失效分析重点实验室,河南洛阳471004

出　　处：《热加工工艺》2022年第13期149-150,156,共3页Hot Working Technology

摘　　要：某灰铸铁配重在装配螺栓时发生了断裂。采用化学成分分析、金相检验、能谱分析以及力学性能检测等方法,对配重的断裂原因进行了分析。结果表明:配重断口上存在疏松和缩孔的铸造缺陷,大量的磷共晶和严重的碳化物增加了零件的脆性,非金属夹杂物造成了局部应力集中,最终造成配重在装配时脆性断裂。Fracture of the gray cast iron counterweight occurs during bolt assembly. The fracture causes of the counterweight were analyzed by chemical composition analysis, metallographic analysis, energy spectrum analysis and mechanical properties test. The results show that there are casting defects such as shrinkage holes and porosities in the fracture of the counterweight, the brittleness of parts is increased by large amounts of phosphorous eutectic and carbides, stress concentration is caused by nonmetallic inclusions, which eventually cause brittle fracture of the counterweight during assembly.

关 键 词：铸造缺陷 脆性断裂 磷共晶 碳化物 非金属夹杂物 

分 类 号：TG250.6[金属学及工艺—铸造]