Effects of melt-pool geometry on the oriented to misoriented transition in directed energy deposition of a single-crystal superalloy

被引:15
作者
Zhang, Peiyu [1 ,2 ]
Zhou, Xin [1 ]
Zhang, Wenqian [3 ]
Zhang, Ting [1 ]
Ding, Guoquan [1 ]
Cheng, Xing [1 ]
机构
[1] Air Force Engn Univ, Sci & Technol Plasma Dynam Lab, Xian 710038, Peoples R China
[2] PLA Unit 93119, Jiuquan 73500, Peoples R China
[3] Air Force Engn Univ, Equipment Management & Unmanned Aerial Vehicle Eng, Xian 710038, Peoples R China
基金
中国国家自然科学基金;
关键词
Directed energy deposition; Single-crystal superalloy; Melt pool; Oriented to misoriented transition; Mathematical model; LASER POWDER DEPOSITION; NICKEL-BASE SUPERALLOYS; STRAY GRAIN FORMATION; SUBSTRATE ORIENTATION; MICROSTRUCTURE FORMATION; FLUID-FLOW; GROWTH; SOLIDIFICATION; REPAIR; OPTIMIZATION;
D O I
10.1016/j.addma.2022.103253
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The successful repair of single-crystal (SX) gas turbine blades using the directed energy deposition (DED) technique requires unidirectional dendrite growth without an oriented to misoriented transition (OMT). In this work, the effects of melt-pool geometrical parameters on OMT behavior during single-track deposition of SX superalloys were thoroughly studied. The variations in melt-pool length, width, height and depth on the solid-ified structure characteristics (e.g., the number of anisotropic dendrites and the area fraction of [001]-oriented dendrites) were quantitatively examined through experimental observations. A simple mathematical model was established to elucidate the correlations between these parameters and OMT behavior, and the errors in this model were analyzed in detail. The DED parameters were linked with the melt-pool geometrical parameters to find out the suitable processing conditions for SX repair. It is concluded that a melt pool with a relatively low depth-to-height ratio and a high length-to-height ratio is generally beneficial for unidirectional dendrite growth, decreasing the heat and mass input is conducive to obtain such melt-pool shape. The presented findings afford an in-depth understanding of the effects of melt-pool geometry on competitive dendrite growth and are instrumental for the repair of SX gas turbine blades.
引用
收藏
页数:15
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