Effect of small amounts of nitrogen on properties of a Ni-based superalloy

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	Effect of small amounts of nitrogen on properties of a Ni-based superalloy
	X. B. Huang ; Y. Zhang ; Z. Q. Hu
刊名	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
	1999
卷号	30 期号:7 页码:1755-1761
关键词	alloys
ISSN号	1073-5623
中文摘要	The microstructural, tensile, and stress-rupture lives of conventionally and directionally solidified (DS) cast specimens of a nickel-based superalloy have been investigated using materials of normal commercial composition and two melts with additions of 22 and 30 ppm nitrogen. It was found that the ductility, tensile life, and stress-rupture life of the conventional castings dramatically decreased with the increase of nitrogen content, but, in the longitudinal direction of DS samples, these properties were independent of nitrogen within the contents studied. The transverse tensile rupture life of DS castings had no significant change with nitrogen, except for some decrease in elongation of the sample containing 30 ppm N. The stress-rupture life and elongation in the transverse direction of the DS samples were improved at the 22 ppm nitrogen level, which might be attributed to the dendrite refining. Increasing the nitrogen content resulted in a change in carbide morphology from that of a "Chinese script" to a blocky form and a change in microporosity formation, especially in the conventional castings. The increased nitrogen content resulted in a significant reduction in the volume fraction of eutectic microconstituents and the in dendrite refinement in DS samples, but nitrogen content did not affect the morphology of gamma' precipitates in the heat-treated alloys.
原文出处	://WOS:000081605300006
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/37376]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	X. B. Huang,Y. Zhang,Z. Q. Hu. Effect of small amounts of nitrogen on properties of a Ni-based superalloy[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,1999,30(7):1755-1761.
APA	X. B. Huang,Y. Zhang,&Z. Q. Hu.(1999).Effect of small amounts of nitrogen on properties of a Ni-based superalloy.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,30(7),1755-1761.
MLA	X. B. Huang,et al."Effect of small amounts of nitrogen on properties of a Ni-based superalloy".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 30.7(1999):1755-1761.