Research of Casting Technology and Trial-Production of ZL205A Alloy Side Cover Shell
In this paper,the filling,solidification process and defect characteristics of ZL205A alloy side cover shell castings under gravity casting and low pressure casting are simulated and analyzed,and the trial production and performance comparison of side cover shell castings are also conducted.When gravity casting is adopted,the simulation shows that the casting filling speed is fast,the phenomenon of turbulence and mixed flow is serious,the solidification rate is slow and the process is chaotic,and the porosity is high.The defects of shrinkage and segregation on the surface and inside of the sample are serious,and the micro-shrinkage and composition segregation are interwoven in the matrix and grain boundaries.The average tensile strength and elongation of the sampling site are 400 MPa,3.1％in zone A and 444 MPa,3.4％in zone B,indicating that the casting is unqualified.When using low pressure casting,the simulation shows that the mold filling is stable,the solidification rate is fast and the porosity is low.The sample is qualified in inspection,the microstructure is uniform and dense,and the proportion of micro-shrinkage and segregation is significantly reduced.The average tensile strength and elongation of the sampling site are 478 MPa,4.7％in zone A and 484 MPa,4.9％in zone B.The casting is qualified and has excellent performance.The adaptability and advantages of low pressure casting process to ZL205A alloy side cover shell casting are verified.
国家科技期刊平台
NSTL
万方数据
