Effect of nanocrystallization on sulfur segregation in Fe-Cr-Al alloy during oxidation at 1000 degrees C

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	Effect of nanocrystallization on sulfur segregation in Fe-Cr-Al alloy during oxidation at 1000 degrees C
	S. L. Yang; F. H. Wang
	2006
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	65 期号:3-4 页码:195-205
摘要	From the 1980's a theory named "the sulfur effect" has been applied to explain the scale adhesion and the reactive-element effect (REE) during high-temperature oxidation. It claims that the bond between the oxide scale and the metal substrate is intrinsically strong and that impurity sulfur in the metal segregates at the oxide scale/substrate interface and weakens the bond, and that REs getter the sulfur impurity and prevent it from segregating to the interface. In the present study, a cast polycrystalline sulfur-containing Fe-25Cr-5Al-1S (wt.%) alloy and its magnetron-sputtered nanocrystalline coating were oxidized at 1000 degrees C, and the specimens were examined by XRD and SEM. The scale formed on the cast alloy was cracked and detached from the substrate even after isothermal exposure, and obvious sulfur enrichment was detectable at the scale/substrate interface. While, the scale formed on the nanocrystalline coating was very adherent after 100 cycles oxidation. Here, sulfur was preferentially distributed in the outer scale and internal oxides rather than at the scale/substrate interface. These results provide evidence that nanocrystallization can prevent sulfur segregation at the scale/substrate interface, hence enhance scale adhesion.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. univ saskatchewan, dept mech engn, saskatoon, sk s7n 5a9, canada.;yang, sl (reprint author), chinese acad sci, inst met res, state key lab corros & protect, s campus,wencui rd 62, shenyang 110016, peoples r china;songlan.yang@gmail.com
关键词	Nanocrystallization Oxidation Scale Adhesion Sulfur Segregation High-temperature Oxidation Oxide Scale Adherence Selective Oxidation Reactive Elements Al2o3 Scales Behavior Adhesion Resistance Impurity Growth
URL	查看原文
WOS记录号	WOS:000241356400004
引用统计	被引频次：15[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/321006/34646
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. L. Yang,F. H. Wang. Effect of nanocrystallization on sulfur segregation in Fe-Cr-Al alloy during oxidation at 1000 degrees C[J]. Oxidation of Metals,2006,65(3-4):195-205.
APA	S. L. Yang,&F. H. Wang.(2006).Effect of nanocrystallization on sulfur segregation in Fe-Cr-Al alloy during oxidation at 1000 degrees C.Oxidation of Metals,65(3-4),195-205.
MLA	S. L. Yang,et al."Effect of nanocrystallization on sulfur segregation in Fe-Cr-Al alloy during oxidation at 1000 degrees C".Oxidation of Metals 65.3-4(2006):195-205.