Microstructure and mechanical properties of TC4 alloy cylinder with inner ribs prepared by hot isostatic pressing
The densification behavior of TC4 alloy inner ribbed cylindrical parts during hot isostatic pressing(HIP)was studied by using finite element simulation technology.The optimized HIP process parameters were obtained through response surface methodology.HIP experiments were conducted under the optimized process.The density and mechanical properties tests were conducted on different sampling positions of the TC4 alloy inner ribbed cylindrical parts prepared by the HIP.The microstructure and fracture morphology were also characterized.The results show that the outer surface of TC4 alloy inner ribbed cylindrical parts is preferentially densified,with the highest density at the center of the cylinder wall and bottom.The contribution of HIP pressure to densification is more significant than that of insulation and pressure holding time.The microstructures of the wall and bottom of the HIPed product are dense and uniform,with similar room temperature tensile properties.The room temperature tensile properties of the wall are slightly better.At temperature of 350℃,the difference in tensile properties of cylinder wall and bottom is further narrowed and the retention rate of tensile strength reaches nearly 70%.The tensile deformation specimens both at room temperature and 350℃exhibit fracture characteristics dominated by ductile fracture.
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