Influence of solidification conditions and alloying elements Re and Ti on micropores formed during homogenization of Ni base single crystal superalloy

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	Influence of solidification conditions and alloying elements Re and Ti on micropores formed during homogenization of Ni base single crystal superalloy
	Liu, JL; Meng, J; Yu, JJ; Zhou, YZ; Sun, XF; Liu, JL (reprint author), Chinese Acad Sci, Inst Met Res, Superalloy Div, Shenyang 110016, Liaoning, Peoples R China.
	2018-05-25
发表期刊	JOURNAL OF ALLOYS AND COMPOUNDS
ISSN	0925-8388
卷号	746 页码:428-434
摘要	The influence of withdraw rate during directional solidification and elements Re and Ti on the formation of micropores during homogenization in Ni base single crystal superalloy CMSX-4 is investigated by Xray tomography method. The results show that the number of micropores below 5 mm in sample solidified at 10 mm/min after homogenization at 1300 degrees C/3 h is greater than that in the case of 6 mm/min. The number of micropores below 10 mm in Re free and Ti free alloys is rather smaller than that of normal CMSX-4 alloy, while the number of micropores between 15 mm and 25 mm in Ti free alloy is relatively greater than that in Re free alloy. The variation of number of micropores is analyzed based on measurement of primary dendrite arm spacing (PDAS) and segregation ratios of alloying elements, the causes are mainly attributed to reverse segregation tendencies of Re and Ti and their remarkable diffusion coefficient difference, the increasing of PDAS also enhances the propensity of micropores formation during homogenization. (c) 2018 Elsevier B.V. All rights reserved.; The influence of withdraw rate during directional solidification and elements Re and Ti on the formation of micropores during homogenization in Ni base single crystal superalloy CMSX-4 is investigated by Xray tomography method. The results show that the number of micropores below 5 mm in sample solidified at 10 mm/min after homogenization at 1300 degrees C/3 h is greater than that in the case of 6 mm/min. The number of micropores below 10 mm in Re free and Ti free alloys is rather smaller than that of normal CMSX-4 alloy, while the number of micropores between 15 mm and 25 mm in Ti free alloy is relatively greater than that in Re free alloy. The variation of number of micropores is analyzed based on measurement of primary dendrite arm spacing (PDAS) and segregation ratios of alloying elements, the causes are mainly attributed to reverse segregation tendencies of Re and Ti and their remarkable diffusion coefficient difference, the increasing of PDAS also enhances the propensity of micropores formation during homogenization. (c) 2018 Elsevier B.V. All rights reserved.
部门归属	[liu, j. l. ; meng, j. ; yu, j. j. ; zhou, y. z. ; sun, x. f.] chinese acad sci, inst met res, superalloy div, shenyang 110016, liaoning, peoples r china
关键词	High-temperature Creep X-ray Tomography Nickel Porosity Diffusion Growth Mechanisms Behavior Pores Model
学科领域	Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China [1671188, 51601192]
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/79301
专题	中国科学院金属研究所
通讯作者	Liu, JL (reprint author), Chinese Acad Sci, Inst Met Res, Superalloy Div, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Liu, JL,Meng, J,Yu, JJ,et al. Influence of solidification conditions and alloying elements Re and Ti on micropores formed during homogenization of Ni base single crystal superalloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,746:428-434.
APA	Liu, JL,Meng, J,Yu, JJ,Zhou, YZ,Sun, XF,&Liu, JL .(2018).Influence of solidification conditions and alloying elements Re and Ti on micropores formed during homogenization of Ni base single crystal superalloy.JOURNAL OF ALLOYS AND COMPOUNDS,746,428-434.
MLA	Liu, JL,et al."Influence of solidification conditions and alloying elements Re and Ti on micropores formed during homogenization of Ni base single crystal superalloy".JOURNAL OF ALLOYS AND COMPOUNDS 746(2018):428-434.