Analysis and Prevention of Cracks in the S16R Frame
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.
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