The hot deformation characteristics of Rene88DT superalloy with directionally solidified micro- structure produced by electroslag remelting continuous directionally solidification （ESR-CDS） were studied in the tempe...The hot deformation characteristics of Rene88DT superalloy with directionally solidified micro- structure produced by electroslag remelting continuous directionally solidification （ESR-CDS） were studied in the temperature range of 1,040-1,140 ℃ and strain rate range of 0.001-1.000 s-1 by hot compression tests. Flow curves for Rene88DT alloy with initial directionally solidified （DS） microstructure exhibit pronounced peak stresses at the early stage of deformation followed by the occurrence of dynamic softening phenomenon. Rene88DT alloy with DS micro- structure shows higher flow peak stresses compared with HIPed P/M superalloy FGH4096, but the disparities in peak stresses between ESR-CDSed Rene88DT and HIPed P/M superalloy FGH4096 reduce as temperature increases. The improvement of hot workability of DS alloy with columnar grains avoiding the maximum shear stress comes true. A hot deformation constitutive equation as a function of strain that describes the dependence of flow stress on strain rate and temperature is established. Hot deformation apparent acti- vation energy （Q） varies not only with the strain rate and temperature but also with strain. The strain rate sensitivity exponent （m） map is established at the strain of 0.8, which reveals that global dynamic recrystallization （DRX） shows a relatively high m value in a large strain compression. Optimum parameters are predicted in two regions： T = 1,100-1,130 ℃, ε = 0.100-1.000 s-1 and T = 1,080- 1,100 ℃, ε = 0.010-100 s-1, which is based on pro- cessing maps and deformation microstructure observations.展开更多
Nickel-based superalloy Rene88DT,has been laser-deposited using laser rapid forming (LRF) route.The mechanical properties and microstructure characteristics of LRF Rene88DT at 25℃ and 750℃ were evaluated.The results...Nickel-based superalloy Rene88DT,has been laser-deposited using laser rapid forming (LRF) route.The mechanical properties and microstructure characteristics of LRF Rene88DT at 25℃ and 750℃ were evaluated.The results shows that both strength and ductility of LRF Rene88DT can be improved significantly by the integration of optimized heat treatment (solution treatment (1160℃,2h/AC) + aging (760℃,8h/AC)) and the HIP treatment(1160℃,2h/200MPa).25℃ tensile properties is comparable to that of the Powder Metallurgy standard.The 750℃ tensile strength and ductility are also comparable to those of the Powder Metallurgy standard,but the yield strength is still a little lower at 750℃.As compared with the as-deposited state,g' precipitates of LRF Rene88DT are evolved gradually to be spherical in shape and uniformly distribute in the g matrix after optimized heat treatment and HIP treatment.Fracture surface shows that crack initiates at the edge for all the samples of LRF Rene88DT after tensile deformation.The deformation is found to be homogeneous in the whole sample.Necking phenomenon exists near the fracture surface,which corresponds with the superior strength and ductility of LRF Rene88DT.展开更多
基金financially supported by the Military Supporting Project (No. JPPT125GJGG11)
文摘The hot deformation characteristics of Rene88DT superalloy with directionally solidified micro- structure produced by electroslag remelting continuous directionally solidification （ESR-CDS） were studied in the temperature range of 1,040-1,140 ℃ and strain rate range of 0.001-1.000 s-1 by hot compression tests. Flow curves for Rene88DT alloy with initial directionally solidified （DS） microstructure exhibit pronounced peak stresses at the early stage of deformation followed by the occurrence of dynamic softening phenomenon. Rene88DT alloy with DS micro- structure shows higher flow peak stresses compared with HIPed P/M superalloy FGH4096, but the disparities in peak stresses between ESR-CDSed Rene88DT and HIPed P/M superalloy FGH4096 reduce as temperature increases. The improvement of hot workability of DS alloy with columnar grains avoiding the maximum shear stress comes true. A hot deformation constitutive equation as a function of strain that describes the dependence of flow stress on strain rate and temperature is established. Hot deformation apparent acti- vation energy （Q） varies not only with the strain rate and temperature but also with strain. The strain rate sensitivity exponent （m） map is established at the strain of 0.8, which reveals that global dynamic recrystallization （DRX） shows a relatively high m value in a large strain compression. Optimum parameters are predicted in two regions： T = 1,100-1,130 ℃, ε = 0.100-1.000 s-1 and T = 1,080- 1,100 ℃, ε = 0.010-100 s-1, which is based on pro- cessing maps and deformation microstructure observations.
文摘Nickel-based superalloy Rene88DT,has been laser-deposited using laser rapid forming (LRF) route.The mechanical properties and microstructure characteristics of LRF Rene88DT at 25℃ and 750℃ were evaluated.The results shows that both strength and ductility of LRF Rene88DT can be improved significantly by the integration of optimized heat treatment (solution treatment (1160℃,2h/AC) + aging (760℃,8h/AC)) and the HIP treatment(1160℃,2h/200MPa).25℃ tensile properties is comparable to that of the Powder Metallurgy standard.The 750℃ tensile strength and ductility are also comparable to those of the Powder Metallurgy standard,but the yield strength is still a little lower at 750℃.As compared with the as-deposited state,g' precipitates of LRF Rene88DT are evolved gradually to be spherical in shape and uniformly distribute in the g matrix after optimized heat treatment and HIP treatment.Fracture surface shows that crack initiates at the edge for all the samples of LRF Rene88DT after tensile deformation.The deformation is found to be homogeneous in the whole sample.Necking phenomenon exists near the fracture surface,which corresponds with the superior strength and ductility of LRF Rene88DT.
