1 Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; 2 School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China; 3 Jiang Su Feiyue Machine and Pump Group Co., Ltd., Jingjiang 225300, Jiangsu, China
Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy
1 Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China; 2 School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China; 3 Jiang Su Feiyue Machine and Pump Group Co., Ltd., Jingjiang 225300, Jiangsu, China
摘要 The effect of boron addition (0.010, 0.015, and 0.020 wt.%) on the microstructure and mechanical properties of an additively manufactured superalloy was examined. The as-built microstructure was investigated by scanning electron microscopy and transmission electron microscopy. The results demonstrate that boron precipitates as M3B2 boride at the grain boundary. The increase in boron content increases the amount of c/c0 eutectic and the size and fraction of M3B2 boride. Boron creates nanoscale fine borides at grain boundaries, which significantly reinforces grain boundaries. The mechanical property analysis indicated that the addition of boron improved the tensile ductility at 760 C and stress rupture properties at 760 C/780 MPa. However, with the excessive addition of boron, the mechanical property was reduced.
Abstract：The effect of boron addition (0.010, 0.015, and 0.020 wt.%) on the microstructure and mechanical properties of an additively manufactured superalloy was examined. The as-built microstructure was investigated by scanning electron microscopy and transmission electron microscopy. The results demonstrate that boron precipitates as M3B2 boride at the grain boundary. The increase in boron content increases the amount of c/c0 eutectic and the size and fraction of M3B2 boride. Boron creates nanoscale fine borides at grain boundaries, which significantly reinforces grain boundaries. The mechanical property analysis indicated that the addition of boron improved the tensile ductility at 760 C and stress rupture properties at 760 C/780 MPa. However, with the excessive addition of boron, the mechanical property was reduced.
Rui Wang,Dao-hong Wang,Peng Zhang, et al. Effect of boron addition on microstructure and mechanical properties of an additively manufactured superalloy[J]. Journal of Iron and Steel Research International, 2023, 30(03): 601-609.
2023, Vol. 30 
