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

作　　者：宫显辉 颉向旭 张涛 郭盼 GONG Xianhui;XIE Xiangxu;ZHANG Tao;GUO Pan(Shaanxi Diesel Engine Heavy Industry Co.,Ltd.,Xingping 713100,China)

机构地区：[1]陕西柴油机重工有限公司,陕西兴平713100

出　　处：《铸造技术》2021年第12期1041-1043,1054,共4页Foundry Technology

摘　　要：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.

关 键 词：球墨铸铁 裂纹 残余应力 

分 类 号：TG255[金属学及工艺—铸造] TG245