TY - JOUR
T1 - Solidification of niobium-silicide-based alloys during laser additive manufacturing process
AU - Allen, A.
AU - Douglas, A. C.
AU - Feitosa, L. M.
AU - Qian, H.
AU - Li, J.
AU - Dong, H. B.
AU - Lin, X.
AU - Li, Y.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2019/6/17
Y1 - 2019/6/17
N2 - Niobium silicide-based composites, in the application of gas turbine blades, promise significant efficiency improvements compared to current Ni-based alloys. The higher temperature capability would allow the engine to run at a higher temperature than that of current alloys, increasing engine efficiency. Nb-Si based composites possess a lower density, due to the presence of ceramic phases such as Nb5Si3 and/or Nb3Si. This would reduce the weight of the rotating blades. However, improvements in certain properties, such as room temperature toughness and oxidation resistance are needed. This study focuses on the manufacturability aspect of the powder feeding laser additive manufacturing (LAM) process to engineering Nb-Si based alloy samples. LAM has the advantage of forming near-net shapes without the use of expensive cores and moulds for the reactive Nb-Si melt. Fine microstructure and even chemical composition distribution with reduced macro-segregation are obtained. With the use of power feeding system, new Nb-Si based alloys are LAMed with varying atomic composition. Microstructures of the LAMed alloys will be presented, and the relationship between the microstructure and the alloy chemistry will be reported.
AB - Niobium silicide-based composites, in the application of gas turbine blades, promise significant efficiency improvements compared to current Ni-based alloys. The higher temperature capability would allow the engine to run at a higher temperature than that of current alloys, increasing engine efficiency. Nb-Si based composites possess a lower density, due to the presence of ceramic phases such as Nb5Si3 and/or Nb3Si. This would reduce the weight of the rotating blades. However, improvements in certain properties, such as room temperature toughness and oxidation resistance are needed. This study focuses on the manufacturability aspect of the powder feeding laser additive manufacturing (LAM) process to engineering Nb-Si based alloy samples. LAM has the advantage of forming near-net shapes without the use of expensive cores and moulds for the reactive Nb-Si melt. Fine microstructure and even chemical composition distribution with reduced macro-segregation are obtained. With the use of power feeding system, new Nb-Si based alloys are LAMed with varying atomic composition. Microstructures of the LAMed alloys will be presented, and the relationship between the microstructure and the alloy chemistry will be reported.
KW - diffusion
KW - laser additive manufacturing
KW - microstructure evolution
KW - niobium-silicides
KW - rapid freezing
UR - http://www.scopus.com/inward/record.url?scp=85067870880&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/529/1/012006
DO - 10.1088/1757-899X/529/1/012006
M3 - 会议文章
AN - SCOPUS:85067870880
SN - 1757-8981
VL - 529
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012006
T2 - Joint 5th International Conference on Advances in Solidification Processes, ICASP 2019 and 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining, CSSCR 2019
Y2 - 17 June 2019 through 21 June 2019
ER -