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Effect of Solution Annealing on Microstructure and Mechanical Properties of a Ni-Cr-W-Fe Alloy
Ou, Meiqiong; Ma, Yingche; Hao, Xianchao; Wan, Baifang; Liang, Tian; Liu, Kui; Ma, YC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.; Ma, YC (reprint author), Jiangsu Toland Alloy Co Ltd, Danyang 212352, Peoples R China.
2017-11-01
Source PublicationJOURNAL MATER SCI TECHNOL
ISSN1005-0302
Volume33Issue:11Pages:1300-1307
AbstractThe effect of solution annealing on the microstructure and mechanical properties of a Ni-Cr-W-Fe alloy developed for advanced 700 degrees ultra-supercritical power plants was investigated. Test samples in this study were subjected to different solution treatments and the same aging treatment (at760 degrees C for 1 h). When solution annealing temperature was elevated from 1020 degrees C to 1150 degrees C, the stress-rupture life at 750 degrees C/320MPa was increased from 60 h to 300 h, the stress-rupture elongation was enhanced from 12% to 17%, and the elongation of the tensile at 750 degrees C was improved from 11% to 24%. All tensile and stress-rupture samples displayed an intergranular dimple mixed fracture. Intergranular micro-cracks had a great relationship with the morphology of grain boundary carbides. Most carbides retained the morphology of globular shape and continuous thin plate. After tensile and stress-rupture tests, a few carbides were converted into lamellar. The results showed that intergranular micro-cracks were easier to form at continuous thin plate carbides than at globular shape carbides. Lamellar carbides hardly caused the nucleation of micro-cracks. Besides, grain boundaries sliding and elements diffusion during stressrupture tests led to the formation of precipitate free zones, which accelerated the extension of microcracks and influenced the stress- rupture life. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.; The effect of solution annealing on the microstructure and mechanical properties of a Ni-Cr-W-Fe alloy developed for advanced 700 degrees ultra-supercritical power plants was investigated. Test samples in this study were subjected to different solution treatments and the same aging treatment (at760 degrees C for 1 h). When solution annealing temperature was elevated from 1020 degrees C to 1150 degrees C, the stress-rupture life at 750 degrees C/320MPa was increased from 60 h to 300 h, the stress-rupture elongation was enhanced from 12% to 17%, and the elongation of the tensile at 750 degrees C was improved from 11% to 24%. All tensile and stress-rupture samples displayed an intergranular dimple mixed fracture. Intergranular micro-cracks had a great relationship with the morphology of grain boundary carbides. Most carbides retained the morphology of globular shape and continuous thin plate. After tensile and stress-rupture tests, a few carbides were converted into lamellar. The results showed that intergranular micro-cracks were easier to form at continuous thin plate carbides than at globular shape carbides. Lamellar carbides hardly caused the nucleation of micro-cracks. Besides, grain boundaries sliding and elements diffusion during stressrupture tests led to the formation of precipitate free zones, which accelerated the extension of microcracks and influenced the stress- rupture life. (C) 2016 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
description.department[ou, meiqiong ; ma, yingche ; hao, xianchao ; liang, tian ; liu, kui] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china ; [ou, meiqiong] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china ; [ma, yingche ; wan, baifang] jiangsu toland alloy co ltd, danyang 212352, peoples r china
KeywordNi-cr-w-fe Alloy Solution Annealing Grain Boundaries Carbides Precipitate Free Zones Mechanical Properties
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78998
Collection中国科学院金属研究所
Corresponding AuthorMa, YC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.; Ma, YC (reprint author), Jiangsu Toland Alloy Co Ltd, Danyang 212352, Peoples R China.
Recommended Citation
GB/T 7714
Ou, Meiqiong,Ma, Yingche,Hao, Xianchao,et al. Effect of Solution Annealing on Microstructure and Mechanical Properties of a Ni-Cr-W-Fe Alloy[J]. JOURNAL MATER SCI TECHNOL,2017,33(11):1300-1307.
APA Ou, Meiqiong.,Ma, Yingche.,Hao, Xianchao.,Wan, Baifang.,Liang, Tian.,...&Ma, YC .(2017).Effect of Solution Annealing on Microstructure and Mechanical Properties of a Ni-Cr-W-Fe Alloy.JOURNAL MATER SCI TECHNOL,33(11),1300-1307.
MLA Ou, Meiqiong,et al."Effect of Solution Annealing on Microstructure and Mechanical Properties of a Ni-Cr-W-Fe Alloy".JOURNAL MATER SCI TECHNOL 33.11(2017):1300-1307.
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