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Investigation on the microstructural evolution and precipitation hardening mechanism of 1Cr15Ni36W3Ti superalloy with varied C contents
Li, Haoze; Jiang, Bochuan; Gao, Ming; Xing, Weiwei; Ma, Yingche; Liu, Kui
2019-11-05
Source PublicationMATERIALS & DESIGN
ISSN0264-1275
Volume181
AbstractImpacts of C content on the microstructural evolution and precipitation hardening mechanism in 1Cr15Ni36W3Ti was studied by phase modelling, microstructural analysis and room-temperature tensile test. The casting material was composed of gamma, interdendritic primary MC and secondary MC carbides. The morphology of the primary MC carbide, the amount of which was proportional to the C content, transformed from bulk and short rod-like to skeleton with the C content increasing. The primary MC carbides crushed in pieces during hot working and served as grain-boundary pinning particles during solution treatment. The increased C content made the precipitation of the gamma' phase transform from nucleation dominated to growth dominated at the second-stage aging treatment, which increased the average diameter but lowered the volume fraction of the gamma' phase. Accordingly, the gamma'/dislocation interaction transformed from dislocation shearing to complete Orowan looping upon yielding, leading to the declined yield and tensile strength. The coherency strengthening mechanism played an important role in the reinforcement of this alloy. The C content of this kind of superalloy with a low amount of gamma' forming element should be limited below a proper level so as to maximize the coherency strengthening contribution. (C) 2019 The Authors. Published by Elsevier Ltd.
KeywordFe-Ni based superalloy C content gamma ' phase Strengthening mechanism Tensile property
Indexed BySCI
Language英语
WOS IDWOS:000487763800043
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80641
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Li, Haoze,Jiang, Bochuan,Gao, Ming,et al. Investigation on the microstructural evolution and precipitation hardening mechanism of 1Cr15Ni36W3Ti superalloy with varied C contents[J]. MATERIALS & DESIGN,2019,181.
APA Li, Haoze,Jiang, Bochuan,Gao, Ming,Xing, Weiwei,Ma, Yingche,&Liu, Kui.(2019).Investigation on the microstructural evolution and precipitation hardening mechanism of 1Cr15Ni36W3Ti superalloy with varied C contents.MATERIALS & DESIGN,181.
MLA Li, Haoze,et al."Investigation on the microstructural evolution and precipitation hardening mechanism of 1Cr15Ni36W3Ti superalloy with varied C contents".MATERIALS & DESIGN 181(2019).
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