On the 650 degrees C thermostability of 9-12Cr heat resistant steels containing different precipitates

IMR OpenIR

	On the 650 degrees C thermostability of 9-12Cr heat resistant steels containing different precipitates
	Wang, Hai; Yan, Wei; van Zwaag, Sybrand; Shi, Quanqiang; Wang, Wei; Yang, Ke; Shan, Yiyin; Yan, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
	2017-08-01
发表期刊	PERGAMON-ELSEVIER SCIENCE LTD
ISSN	1359-6454
卷号	134 页码:143-154
摘要	The thermal stability of the microstructure, in particular that of the precipitates, has been known to be a critical factor for the creep strength of 9-12Cr martensitic heat-resistant steels. In the present study, four martensitic heat-resistant steels were designed to have different precipitate types and morphologies. Steel NS1 (nitride strengthened, NS) has a low density of fine nitrides and Steel NS2 is strengthened by a high density of fine nitrides. Steel CNS (carbide and nitride strengthened, CNS) contains large size carbides and fine carbonitrides and Steel CS (carbide strengthened, CS) mainly possesses large size carbides. Both aging and creep tests at 650 degrees C were employed to evaluate the stability of the microstructure and properties of the steels during high-temperature exposure as a function of the precipitate morphology. It was found that Steel NS1 and Steel NS2 displayed a good creep performance, but they already recrystallized after a relatively short-term aging treatment. On the other hand, Steel CNS and Steel CS gave poor creep strength, but they could still maintain the tempered martensitic microstructure during long-term aging. The relation between microstructural stability and precipitate morphology/density was linked to the dislocation-precipitate interaction. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The thermal stability of the microstructure, in particular that of the precipitates, has been known to be a critical factor for the creep strength of 9-12Cr martensitic heat-resistant steels. In the present study, four martensitic heat-resistant steels were designed to have different precipitate types and morphologies. Steel NS1 (nitride strengthened, NS) has a low density of fine nitrides and Steel NS2 is strengthened by a high density of fine nitrides. Steel CNS (carbide and nitride strengthened, CNS) contains large size carbides and fine carbonitrides and Steel CS (carbide strengthened, CS) mainly possesses large size carbides. Both aging and creep tests at 650 degrees C were employed to evaluate the stability of the microstructure and properties of the steels during high-temperature exposure as a function of the precipitate morphology. It was found that Steel NS1 and Steel NS2 displayed a good creep performance, but they already recrystallized after a relatively short-term aging treatment. On the other hand, Steel CNS and Steel CS gave poor creep strength, but they could still maintain the tempered martensitic microstructure during long-term aging. The relation between microstructural stability and precipitate morphology/density was linked to the dislocation-precipitate interaction. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[wang, hai] northeastern univ, sch mat sci & engn, shenyang 110819, liaoning, peoples r china ; [wang, hai ; yan, wei ; shi, quanqiang ; wang, wei ; yang, ke ; shan, yiyin] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china ; [yan, wei ; shi, quanqiang ; wang, wei ; yang, ke ; shan, yiyin] chinese acad sci, imr, key lab nucl mat & safety assessment, shenyang 110014, liaoning, peoples r china ; [van zwaag, sybrand] delft univ technol, fac aerosp engn, novel aerosp mat grp, kluyverweg 1, nl-2629 hs delft, netherlands
关键词	Microstructural Thermostability Precipitate Heat-resistant Steel 9-12cr Steel
学科领域	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	sub topic of Advanced Fission Energy Program-ADS Transmutation System [XDA03010301, XDA03010302]; Chinese Academy of Sciences Strategic Priority Research Program [XDA03010000]; China Scholarship Council
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/321006/79169
专题	中国科学院金属研究所
通讯作者	Yan, W (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Wang, Hai,Yan, Wei,van Zwaag, Sybrand,et al. On the 650 degrees C thermostability of 9-12Cr heat resistant steels containing different precipitates[J]. PERGAMON-ELSEVIER SCIENCE LTD,2017,134:143-154.
APA	Wang, Hai.,Yan, Wei.,van Zwaag, Sybrand.,Shi, Quanqiang.,Wang, Wei.,...&Yan, W .(2017).On the 650 degrees C thermostability of 9-12Cr heat resistant steels containing different precipitates.PERGAMON-ELSEVIER SCIENCE LTD,134,143-154.
MLA	Wang, Hai,et al."On the 650 degrees C thermostability of 9-12Cr heat resistant steels containing different precipitates".PERGAMON-ELSEVIER SCIENCE LTD 134(2017):143-154.