A combination of casting and laser remelting was employed to develop a high-strength and heat-resistant Al-Si-Fe alloy suitable for powder bed fusion using a laser beam(PBF-LB).By clarifying the effects of the incorpo...A combination of casting and laser remelting was employed to develop a high-strength and heat-resistant Al-Si-Fe alloy suitable for powder bed fusion using a laser beam(PBF-LB).By clarifying the effects of the incorporated elements and their contents on the microstructure and mechanical performance of Al-Si-Fe alloys,the composition was optimized as Al-11Si-2.5Fe-2Mn-1.2Ni-0.4Cr(in wt.%).The optimized alloy was subsequently validated using PBF-LB,which exhibited favorable machinability,achieving a density of 99.8%.The room-temperature tensile strength of the PBF-LB manufactured Al-Si-Fe alloy reached(512.76±3.26)MPa,with a yield strength of(337.79±2.36)MPa and an elongation of(2.98±0.07)%.The enhanced room-temperature mechanical properties could be mainly attributed to the combined effects of fine-grain strengthening,solid solution strengthening,and precipitation strengthening.At 300°C,the high-temperature tensile strength of the developed alloy reached(222.47±6.41)MPa,with a yield strength of(164.25±11.40)MPa and an elongation of(8.88±0.33)%,outperforming those of existing alloys documented in the literature.The improved high-temperature mechanical performance was primarily provided by the three-dimensional network comprising cellular heat-resistant Al17(FeMnNiCr)4Si2 andα-Al(FeMn)Si phases.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52375393,52071299)the Science and Technology Innovation Talent Team of Shanxi Province,China(No.202304051001029)+3 种基金the Scientific and Technological Achievements Transformation Guidance Project of Shanxi Province,China(No.202204021301048)the Key R&D Program of Shanxi Province,China(Nos.2210300058MZ,202202150401020)the Hai’an&Taiyuan University of Technology Advanced Manufacturing and Intelligent Equipment Industrial Research Institute,China(No.2023HA-TYUTKFYF020)the Young Elite Scientists Sponsorship Program by CAST,China(No.2023QNRC001).
文摘A combination of casting and laser remelting was employed to develop a high-strength and heat-resistant Al-Si-Fe alloy suitable for powder bed fusion using a laser beam(PBF-LB).By clarifying the effects of the incorporated elements and their contents on the microstructure and mechanical performance of Al-Si-Fe alloys,the composition was optimized as Al-11Si-2.5Fe-2Mn-1.2Ni-0.4Cr(in wt.%).The optimized alloy was subsequently validated using PBF-LB,which exhibited favorable machinability,achieving a density of 99.8%.The room-temperature tensile strength of the PBF-LB manufactured Al-Si-Fe alloy reached(512.76±3.26)MPa,with a yield strength of(337.79±2.36)MPa and an elongation of(2.98±0.07)%.The enhanced room-temperature mechanical properties could be mainly attributed to the combined effects of fine-grain strengthening,solid solution strengthening,and precipitation strengthening.At 300°C,the high-temperature tensile strength of the developed alloy reached(222.47±6.41)MPa,with a yield strength of(164.25±11.40)MPa and an elongation of(8.88±0.33)%,outperforming those of existing alloys documented in the literature.The improved high-temperature mechanical performance was primarily provided by the three-dimensional network comprising cellular heat-resistant Al17(FeMnNiCr)4Si2 andα-Al(FeMn)Si phases.
