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Effect of carbon on the microstructure and stress rupture properties of a new Ni-Cr-W-Fe alloy for advanced ultra-supercritical power plants
Ou, MQ; Hao, XC; Ma, YC; Liu, RC; Zhang, L; Liu, K; Ma, YC (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
2018-01-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume732Pages:107-115
AbstractThis paper studied the effect of carbon on the microstructure and stress rupture properties of a new Ni-Cr-W-Fe alloy. With carbon content increasing from 0.008 wt% to 0.073 wt%, the volume fraction and average size of MC and M23C6 carbides increased significantly. The morphology of MC remained dispersed blocky shape while the morphology of M23C6 changed from continuous thin strip to granular. But no obvious variations were observed in the quantity, size and morphology of gamma ' phase. During heat treatment, the hot-rolled grains grew up quickly and the grain growth rate of 0.008% C alloy was almost three times higher than that of 0.073% C alloy. The reason was that the MC carbides effectively inhibited the grain growth. After stress rupture test at 750 degrees C/300 MPa and 750 degrees C/400 MPa, the stress rupture life was in parabolic curve relationship with carbon content, 0.034 wt% and 0.045 wt% C alloys had higher stress rupture lives than other alloys. With the increase of carbon content, the ductility increased firstly and then reached relatively stable status, the fracture mode gradually varied from intergranular fracture to intergranular dimple mixed fracture. The change of stress rupture properties with carbon content was closely related to carbides and the grain size, which would be analyzed in this paper. (c) 2017 Elsevier B.V. All rights reserved.; This paper studied the effect of carbon on the microstructure and stress rupture properties of a new Ni-Cr-W-Fe alloy. With carbon content increasing from 0.008 wt% to 0.073 wt%, the volume fraction and average size of MC and M23C6 carbides increased significantly. The morphology of MC remained dispersed blocky shape while the morphology of M23C6 changed from continuous thin strip to granular. But no obvious variations were observed in the quantity, size and morphology of gamma ' phase. During heat treatment, the hot-rolled grains grew up quickly and the grain growth rate of 0.008% C alloy was almost three times higher than that of 0.073% C alloy. The reason was that the MC carbides effectively inhibited the grain growth. After stress rupture test at 750 degrees C/300 MPa and 750 degrees C/400 MPa, the stress rupture life was in parabolic curve relationship with carbon content, 0.034 wt% and 0.045 wt% C alloys had higher stress rupture lives than other alloys. With the increase of carbon content, the ductility increased firstly and then reached relatively stable status, the fracture mode gradually varied from intergranular fracture to intergranular dimple mixed fracture. The change of stress rupture properties with carbon content was closely related to carbides and the grain size, which would be analyzed in this paper. (c) 2017 Elsevier B.V. All rights reserved.
description.department[ou, meiqiong ; hao, xianchao ; ma, yingche ; liu, ruichang ; zhang, long ; 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
KeywordGrain-boundary Serration Nickel-based Superalloy Base Superalloy Inconel Alloy-740 Creep-properties Carbides Deformation Evolution Behavior Precipitation
Subject AreaChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79566
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.
Recommended Citation
GB/T 7714
Ou, MQ,Hao, XC,Ma, YC,et al. Effect of carbon on the microstructure and stress rupture properties of a new Ni-Cr-W-Fe alloy for advanced ultra-supercritical power plants[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2018,732:107-115.
APA Ou, MQ.,Hao, XC.,Ma, YC.,Liu, RC.,Zhang, L.,...&Ma, YC .(2018).Effect of carbon on the microstructure and stress rupture properties of a new Ni-Cr-W-Fe alloy for advanced ultra-supercritical power plants.JOURNAL OF ALLOYS AND COMPOUNDS,732,107-115.
MLA Ou, MQ,et al."Effect of carbon on the microstructure and stress rupture properties of a new Ni-Cr-W-Fe alloy for advanced ultra-supercritical power plants".JOURNAL OF ALLOYS AND COMPOUNDS 732(2018):107-115.
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