Micro-segregation and Precipitation of Alloy 690 during Isothermal Solidification: the Role of Nitrogen Content

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	Micro-segregation and Precipitation of Alloy 690 during Isothermal Solidification: the Role of Nitrogen Content
	R. Jiang; B. Chen; X. C. Hao; Y. C. Ma; S. Li; K. Liu
	2012
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	28 期号:5 页码:446-452
摘要	The segregation and precipitation behavior of Alloy 690 containing 0.001-0.11 wt% nitrogen during isothermal solidification at 1370 and 1355 degrees C have been investigated using optical microscopy (OM), electron probe microanalysis (EPMA) and transmission electron microscopy (TEM). The results indicate that the volume fraction of TiN-type nitride formed during isothermal solidification increases with the nitrogen content of Alloy 690. Segregation of Ti and Cr exists in samples solidified at 1370 and 1355 degrees C. The Ti content in the residual liquid markedly decreases and the concentration of Cr increases when the nitrogen content of Alloy 690 increases. Furthermore, N and S also show segregation to some extent in the residual liquids at 1355 degrees C. Accompanying by the segregation of Cr, Ti, C, N and S, sulfides and chromium nitrides form. In a low nitrogen content Alloy 690, sulfur segregates and precipitates in the form of Ti4C2S2 and (Cr, Ti)S, but in the form of (Cr, Ti)S or CrS in a high nitrogen content Alloy 690. (Cr, Ti)N-type nitrides with an fcc crystal structure have been identified in a sample with 0.11 wt% nitrogen.
部门归属	[jiang, rong; chen, bo; hao, xianchao; ma, yingche; li, shuo; liu, kui] chinese acad sci, inst met res, shenyang 110016, peoples r china.;ma, yc (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china.;ycma@imr.ac.cn
关键词	Alloy 690 Nitrogen Content Solidification Micro-segregation Precipitate Austenitic Stainless-steel Nickel-base Superalloys Corrosion-resistance Chromium Depletion Tensile Properties Heat-treatment Microstructure Evolution Behavior Sulfur
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60022
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	R. Jiang,B. Chen,X. C. Hao,et al. Micro-segregation and Precipitation of Alloy 690 during Isothermal Solidification: the Role of Nitrogen Content[J]. Journal of Materials Science & Technology,2012,28(5):446-452.
APA	R. Jiang,B. Chen,X. C. Hao,Y. C. Ma,S. Li,&K. Liu.(2012).Micro-segregation and Precipitation of Alloy 690 during Isothermal Solidification: the Role of Nitrogen Content.Journal of Materials Science & Technology,28(5),446-452.
MLA	R. Jiang,et al."Micro-segregation and Precipitation of Alloy 690 during Isothermal Solidification: the Role of Nitrogen Content".Journal of Materials Science & Technology 28.5(2012):446-452.