大型船用柴油机缸体裂纹缺陷分析及应对措施

Crack Defect Analysis and Countermeasures of Large Marine Diesel Engine Cylinder Block

利用SEM和EDS对大型球墨铸铁柴油机缸体裂纹缺陷进行了分析。结果表明,裂纹位于缸体截面较薄处,以穿晶断裂为主,是由较大的铸造残余应力所引起的。通过降低铸型外部阻力和改善微观组织等措施,在批量生产中消除了裂纹缺陷,缸体质量得到了提高。

The crack defect of cylinder block of large nodular cast iron diesel engine was analyzed by SEM and EDS. The results show that the cracks are located in the thin section of the cylinder block and are mainly transgranular fracture caused by the large casting residual stress. By reducing external resistance and improving microstructure, cracks are eliminated in batch production and the quality of cylinder block is improved.