EXPERIMENTAL AND SIMULATION STUDY OF DIRECTIONAL SOLIDIFICATION PROCESS FOR INDUSTRIAL GAS TURBINE BLADES PREPARED BY LIQUID METAL COOLING

IMR OpenIR

	EXPERIMENTAL AND SIMULATION STUDY OF DIRECTIONAL SOLIDIFICATION PROCESS FOR INDUSTRIAL GAS TURBINE BLADES PREPARED BY LIQUID METAL COOLING
	Lu Yuzhang 1; Xi Huijie 2; Shen Jian 1; Zheng Wei 1; Xie Guang 1,3; Lou Langhong 1; Zhang Jian 1,3
通讯作者	Zhang Jian(jianzhang@imr.ac.cn)
	2015-05-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	51 期号:5 页码:603-611
摘要	Advanced aero and power generation industry needs high-performance gas turbine. As key parts of gas turbine directionally solidified (DS) columnar grain and single crystal (SX) blades operate in heavy stress and high temperature conditions. The continuous demand for increasing turbine inlet temperature and aggressive environment has pushed alloy designers to develop DS and SX Ni-based blade alloys that contain high amount of alloying elements. DS process of blades using such alloys has become a challenging task. The small DS and SX blades are usually produced by high rate solidification (HRS) process. However, the growth of large DS and SX blades requires directional solidification with a sustained thermal gradient along the DS direction. By increasing the thermal gradient, the dendrites are refined, which results in a mechanically-superior DS and SX with reduced defects. One method to achieve consistent and higher thermal gradients is the utilization of the liquid metal cooling (LMC) process. In this method, heat extraction from the outer surface of the mold during DS relies on heat conduction rather than radiation in the conventional HRS process. The optimization of the LMC process is difficult and costly by experimental methods, especially for the complexly shaped industry gas turbine (JOT) blades because of the complicated process parameters associated with the technique. Numerical simulation is an efficient method to solve this problem. In this work, directionally solidified industry gas turbine hollow blades were prepared by high gradient LMC process. Liquid Sn was used as cooling medium. The temperature fields, macrostructures, primary dendrite arm spacing (PDAS) at various withdrawal rates during LMC process have been calculated with ProCAST software. The impact of withdrawal rate on formation of stray grains and freckles was predicted. The calculated results and the experimental observations agreed well. The solidification rates and cooling rates were found to increase with the increase of withdrawal rate. The axial thermal gradient was high and stable during the LMC process. It was found that stray grains would not block the growth of original grains at optimized withdrawal rate. No freckles were observed in the industry gas turbine hollow blades prepared by LMC technique due to the high cooling rate. Though the mean diameters of columnar grains in LMC blades were almost identical to that observed in HRS blades, the PDAS were more than 50% refined in LMC blades than those in HRS blades.
关键词	liquid metal cooling directional solidification industry gas turbine blade numerical simulation
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000355388000012
出版者	SCIENCE PRESS
引用统计	被引频次：12[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/81141
专题	中国科学院金属研究所
通讯作者	Zhang Jian
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Harbin Turbine Co Ltd, Harbin 150000, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Lu Yuzhang,Xi Huijie,Shen Jian,et al. EXPERIMENTAL AND SIMULATION STUDY OF DIRECTIONAL SOLIDIFICATION PROCESS FOR INDUSTRIAL GAS TURBINE BLADES PREPARED BY LIQUID METAL COOLING[J]. ACTA METALLURGICA SINICA,2015,51(5):603-611.
APA	Lu Yuzhang.,Xi Huijie.,Shen Jian.,Zheng Wei.,Xie Guang.,...&Zhang Jian.(2015).EXPERIMENTAL AND SIMULATION STUDY OF DIRECTIONAL SOLIDIFICATION PROCESS FOR INDUSTRIAL GAS TURBINE BLADES PREPARED BY LIQUID METAL COOLING.ACTA METALLURGICA SINICA,51(5),603-611.
MLA	Lu Yuzhang,et al."EXPERIMENTAL AND SIMULATION STUDY OF DIRECTIONAL SOLIDIFICATION PROCESS FOR INDUSTRIAL GAS TURBINE BLADES PREPARED BY LIQUID METAL COOLING".ACTA METALLURGICA SINICA 51.5(2015):603-611.