Gradient microstructure of the specimen was achieved by applying gradient thermoplastic deformation via electric resist-ance heating and hot compression of the cone-shaped specimen. A numerical modeling and experiment...Gradient microstructure of the specimen was achieved by applying gradient thermoplastic deformation via electric resist-ance heating and hot compression of the cone-shaped specimen. A numerical modeling and experiment tests are conducted to investigate the microstructure evolution and mechanical properties in different regions of the specimen subjected to the gradient process parameters. Microstructure analysis revealed a direct relationship between the grain size and processing parameters. The temperature distribution on the gradient specimen ranges from about 800 to 1110 ℃ and equivalent strain along the axis of symmetry of the specimen section ranges from about 0.1 to 1.2. Under a temperature of 1050 ℃ and the equivalent strain of 0.7, the middle region of the specimen section has fine and equiaxed prior-austenitic grains with an average size of (27?±?11) μm. Corresponding to the processing parameters, the lath martensite variants microstructure in this position with the highest hardness of (946?±?17) HV. Consequently, the linkages among hot compression parameters, microstructure, and material properties of hardness are established via a high-throughput method in a cone-shaped specimen.展开更多
基金The authors gratefully acknowledge the support provided by the National Key Research and Development Program of China(No.2017YFB0701801).
文摘Gradient microstructure of the specimen was achieved by applying gradient thermoplastic deformation via electric resist-ance heating and hot compression of the cone-shaped specimen. A numerical modeling and experiment tests are conducted to investigate the microstructure evolution and mechanical properties in different regions of the specimen subjected to the gradient process parameters. Microstructure analysis revealed a direct relationship between the grain size and processing parameters. The temperature distribution on the gradient specimen ranges from about 800 to 1110 ℃ and equivalent strain along the axis of symmetry of the specimen section ranges from about 0.1 to 1.2. Under a temperature of 1050 ℃ and the equivalent strain of 0.7, the middle region of the specimen section has fine and equiaxed prior-austenitic grains with an average size of (27?±?11) μm. Corresponding to the processing parameters, the lath martensite variants microstructure in this position with the highest hardness of (946?±?17) HV. Consequently, the linkages among hot compression parameters, microstructure, and material properties of hardness are established via a high-throughput method in a cone-shaped specimen.
