Near net forming technology on large special-shaped ring forgings of alloy GH4169
The microstructure evolution and mechanical properties of large casing special-shaped ring forgings of alloy GH4169 were stud-ied by near net forming forging process.The actual forgings size was scanned by 3D scanner.Then,under the condition that it was basi-cally consistent with the actual forging process,the forming process of forgings was visualized by finite element analysis,and the problems existing in the forging process were determined.Furthermore,the forging process was optimized.The results show that the fine and uni-form grain size is obtained by the near net forming forging process,the microstructure uniformity of ring forgings is better,the grain size distribution is between 7 and 8 grades,and the average grain size is 8 grades.At room temperature,the tensile strength is 1447 MPa,the yield strength is 1214 MPa,the elongation after fracture is 18.5%,and the section shrinkage is 39%.However,at the high temperature of 650℃,the tensile strength is 1180 MPa,the yield strength is 1030 MPa,the elongation after fracture is 32.5%,and the section shrinkage is 64%,showing the excellent comprehensive mechanical properties and meeting the acceptance requirements for the microstruc-ture performance for a certain type of casing forgings of alloy GH4169.
alloy GH4169near net formingmicrostructuregrain sizemechanical properties
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