Effect of drilling allowance on TBC delamination, spatter and re-melted cracks characteristics in laser drilling of TBC coated superalloys

被引：71
作者：
Fan, Zhengjie [1 ]
Dong, Xia [1 ]
Wang, Kedian [1 ]
Duan, Wenqiang [1 ]
Wang, Rujia [1 ]
Mei, Xuesong [1 ]
Wang, Wenjun [1 ]
Cui, Jianlei [1 ]
Yuan, Xin [1 ]
Xu, Chengying [2 ]
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, Xian 710049, Peoples R China
[2] Univ Cent Florida, Adv Mat Proc & Anal Ctr, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA
来源：
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE | 2016年 / 106卷
基金：
中国国家自然科学基金;
关键词：
Laser drilling; Thermal barrier coating; Drilling allowance; TBC delamination; Spatter; Re-melted cracks; ANGLE; STATE;
D O I：
10.1016/j.ijmachtools.2016.03.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Laser drilling of inclined holes on Ni-based superalloys coated with thermal barrier coatings (TBC) was studied using numerical simulation and experiments. Two types of drilling, three steps-laser drilling (TSLD) method and the one step laser drilling (OSLD), were employed for making comparison. The simulation results demonstrate that relatively strong vortex effect of assist gas at hole entrance and the drilling allowance of the substrate hole can deflect the trajectories of melt flow from leading edge TBC wall. This phenomenon may isolate leading edge of the hole from the ejecting molten material. Thus, shearing stress effect was prevented. The characteristics of TBC delamination, spatter at the TBC leading edge and re-melted cracks along the TBC trailing edge are investigated by comparing the characteristics of the melt flow obtained via simulation and experiment. The combined results suggest that the TBC/substrate multilayer can avoid these defects applying the TSLD technology. (C) 2016 Elsevier Ltd. All rights reserved.
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页码：1 / 10
页数：10
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