In this work,we coated a layer of Y_(2)O_(3) particles in Hastelloy X(HX)nickel-based superalloy powder by in situ chemical method and combined with laser powder bed fusion(LPBF)technology to develop a high-performanc...In this work,we coated a layer of Y_(2)O_(3) particles in Hastelloy X(HX)nickel-based superalloy powder by in situ chemical method and combined with laser powder bed fusion(LPBF)technology to develop a high-performance Y_(2)O_(3)-doping alloy,designated as Y-HX.The results show that the doping of Y_(2)O_(3) particles prevents crack formation during the printing process and reduces solute segregation at cell and grain boundaries by increasing the viscosity of the molten pool.The doping of Y_(2)O_(3) particles to the printed Y-HX alloy enhances grain boundary characteristics,transforming coarse sheet-like carbides into finely dispersed granular carbides at the boundaries during subsequent heat treatment.Additionally,doping with Y_(2)O_(3) particles increases the recrystallization activation energy of the Y-HX alloy from 149.4 to 278.8 kJ mol^(-1).At 750℃,the Y-HX alloy exhibits an ultimate tensile strength of 619±2 MPa and an elongation of 52%±2%,along with an ultimate tensile strength of 325±3 MPa and an elongation of 47%±2% at 900℃.Our work provides a promising way to develop additive-manufactured superalloys with exceptional thermal stability and remarkable high-temperature mechanical properties.展开更多
基金the National Key R&D Program of China(No.2023YFB3712002)the National Natural Science Founda-tion of China(Grant Nos.U22A20172 and 52171044)the Seed Foundation of Tianjin University(Grant No.2023XZL-0015).
文摘In this work,we coated a layer of Y_(2)O_(3) particles in Hastelloy X(HX)nickel-based superalloy powder by in situ chemical method and combined with laser powder bed fusion(LPBF)technology to develop a high-performance Y_(2)O_(3)-doping alloy,designated as Y-HX.The results show that the doping of Y_(2)O_(3) particles prevents crack formation during the printing process and reduces solute segregation at cell and grain boundaries by increasing the viscosity of the molten pool.The doping of Y_(2)O_(3) particles to the printed Y-HX alloy enhances grain boundary characteristics,transforming coarse sheet-like carbides into finely dispersed granular carbides at the boundaries during subsequent heat treatment.Additionally,doping with Y_(2)O_(3) particles increases the recrystallization activation energy of the Y-HX alloy from 149.4 to 278.8 kJ mol^(-1).At 750℃,the Y-HX alloy exhibits an ultimate tensile strength of 619±2 MPa and an elongation of 52%±2%,along with an ultimate tensile strength of 325±3 MPa and an elongation of 47%±2% at 900℃.Our work provides a promising way to develop additive-manufactured superalloys with exceptional thermal stability and remarkable high-temperature mechanical properties.
