摘要
针对S16R机体铸件裂纹问题进行铸造应力、金相和电镜分析.应力场数值模拟结果表明,铸件结构合理,不会产生裂纹缺陷.金相和电镜分析后发现裂纹处存在E型石墨和严重的氧化物.通过控制砂芯强度为1.0～1.2 MPa,熔炼时增加1%碳化硅预处理剂,提高铸件碳含量0.05%和增加0.1%硅锆随流孕育等措施,消除了铸件裂纹缺陷.
Abstract
Directing at the problems of the S16R engine body casting cracks,the casting stress,metallographical,SEM and EDS analyses were carried out.The numerical simulation result of stress field show that the casting structure is reasonable and will not cause crack defects.However,the metallographical,SEM and EDS analyses reveal that there are E-type graphites and severe oxides existing on the positions of the cracks.Through taking measures of controlling the sand core strength at 1.0-1.2 MPa,adding 1%silicon carbide preprocessing agent during melting,increasing the carbon content of the casting by 0.05%,adding 0.1%silicon-zirconium stream inoculation and so on,the crack defects of castings were eliminated successfully.
国家科技期刊平台
NSTL
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