Effects of phosphorus on the delta-Ni3Nb phase precipitation and the stress rupture properties in alloy 718

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	Effects of phosphorus on the delta-Ni3Nb phase precipitation and the stress rupture properties in alloy 718
	W. R. Sun; S. R. Guo; J. H. Lee; N. K. Park; Y. S. Yoo; S. J. Choe; Z. Q. Hu
	1998
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	247 期号:1-2 页码:173-179
摘要	The effects of phosphorus on the phase transformation and stress rupture properties of alloy 718 were investigated. The nucleation of delta-phase, which does not contain phosphorus, was suppressed by the enrichment of phosphorus at grain boundaries. A low level of phosphorus resulted in the formation of faults-containing film-like delta-phase along the grain boundaries, while a higher level of phosphorus favored the long lath-like delta-phase precipitation. Phosphorus greatly prolonged the stress rupture life of the alloy in the range of 0.0008-0.013 wt.%, while it reduced the stress rupture life in the range of 0.013-0.049 wt.%. The effect of phosphorus on the stress rupture properties was closely related to its interaction with oxygen. Phosphorus atoms, in the range of 0.0008-0.013 wt.%, enhanced the resistance to oxygen intrusion along the grain boundaries, protected the grain boundaries from decohesion by oxygen atoms and oxidation, and subsequently prolonged the rupture life of the alloy. The protection effect of P is clearly demonstrated by the phenomenon that the crack initiation site was shifted from the surface to the center in the stress-ruptured samples with increasing addition of P. Over 0.013 wt.%, the protection effect of phosphorus is excessive and phosphorus began to display its inherent effect of damaging the grain boundary strength; the stress rupture life of the alloy was reduced accordingly. Maximum stress rupture life was thus obtained at approximate to 0.113 wt.% P. (C) 1998 Elsevier Science S.A. All rights reserved.
部门归属	acad sinica, inst met res, shenyang 110015, peoples r china. changwon natl univ, dept met & mat sci, changwon 641773, kyungnam, south korea. korea inst machinery & mat, high temp mat lab, changwon 641010, kyungnam, south korea.;sun, wr (reprint author), acad sinica, inst met res, 72 wenhua rd, shenyang 110015, peoples r china
关键词	Superalloy Phosphorus Solidification Rupture Life Hardened Stainless-steel Impact Toughness Trace-elements Segregation Superalloys
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WOS记录号	WOS:000074723700021
引用统计	被引频次：84[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/321006/37781
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	W. R. Sun,S. R. Guo,J. H. Lee,et al. Effects of phosphorus on the delta-Ni3Nb phase precipitation and the stress rupture properties in alloy 718[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1998,247(1-2):173-179.
APA	W. R. Sun.,S. R. Guo.,J. H. Lee.,N. K. Park.,Y. S. Yoo.,...&Z. Q. Hu.(1998).Effects of phosphorus on the delta-Ni3Nb phase precipitation and the stress rupture properties in alloy 718.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,247(1-2),173-179.
MLA	W. R. Sun,et al."Effects of phosphorus on the delta-Ni3Nb phase precipitation and the stress rupture properties in alloy 718".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 247.1-2(1998):173-179.