某型内燃机铝合金活塞的金相检验

借助金相检验相关知识,对某型号内燃机活塞进行了宏观组织和显微组织分析。结果表明:活塞基体部位分散性孔洞为1级,集中性孔洞为1级;复合材料部位分散性孔洞为1级,集中性孔洞为1级;活塞试样组织中α固溶体较大,共晶硅呈短条状,部分呈小块状,初晶硅呈中等块状,略有聚集, 评定为3级;鱼骨状铁相夹杂物及针状铁相夹杂物不明显,铁相夹杂物评定为1级。

Metallographic examination of aluminum alloy piston of an internal combustion engine

Macrostructure and microstructure of the piston of an internal combustion engine were analyzed by means of metallographic examination. The results show that the dispersed porosity and the concentrated porosity in the piston matrix are level 1 and level 1, respectively. The dispersive hole and the concentrated hole in the composite position are grade 1 and grade 1, respectively. The α-solid solution in the piston specimen is large, eutectic silicon is in short strip shape, some are in small block shape, and primary silicon is in medium block shape, and slightly aggregated, so is rated as grade 3. The fishbone-like iron inclusion and acicular iron inclusion are not obvious, so the iron inclusions are rated as grade 1.