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Element Segregation and Solidification Behavior of a Nb, Ti, Al Co-Strengthened Superalloy & x42d;K151
Tan, Yuan-Guo; Liu, Fang; Zhang, An-Wen; Han, Da-Wei; Yao, Xiao-Yu; Zhang, Wei-Wei; Sun, Wen-Ru
2019-10-01
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume32Issue:10Pages:1298-1308
AbstractThe as-cast microstructure, element segregation and solidification behavior of a multi-alloyed superalloy & x42d;K151 have been investigated. The results show that the severe element segregation leads to the complicated precipitations at the inter-dendritic region, including eta-Ni-3(Ti, Nb), eutectic (gamma + gamma ') and Laves, which shows the characteristics of both Ti, Al-strengthened and Nb-strengthened alloys. Differential thermal analysis, heating and quenching tests reveal the solidification sequence as follows: Liquids -> gamma matrix -> (Nb, Ti)C -> eta-Ni-3(Ti, Nb) -> eutectic (gamma + gamma ') -> Laves. The melting points are between 1250 and 1260 degrees C for (Nb, Ti)C, between 1200 and 1210 degrees C for eta phase, between 1180 and 1190 degrees C for eutectic (gamma + gamma ') and Laves. gamma ' initially precipitates from matrix at 1150 degrees C and achieves the maximum precipitation at 1130 degrees C. According to the microstructure evolution captured during solidification and composition analysis by an energy dispersive spectrometer and electron probe microanalyzer, (Nb, Ti)/Al ratio is put forward to explain the formation of eta-Ni-3(Ti, Nb) and eutectic (gamma + gamma '). The solidification of gamma matrix increased the Nb, Ti concentration in the residual liquids, so the high (Nb, Ti)/Al ratio would result in the formation of eta-Ni-3(Ti, Nb); the precipitation of the phase consumed Nb and Ti and decreased the (Nb, Ti)/Al ratio in the liquid, which led to the precipitation of eutectic (gamma + gamma '). Laves formed by the sides of eta-Ni-3(Ti, Nb) and in front of the eutectic (gamma + gamma ') after Al, Ti were further depleted by the two phases and Cr, Co, Mo were rejected to liquids.
KeywordSuperalloy & x42d K151 Solidification Eutectic (gamma plus gamma ') eta-Ni-3(Ti Nb) Laves
Indexed BySCI
Language英语
WOS IDWOS:000485896700013
PublisherCHINESE ACAD SCIENCES, INST METAL RESEARCH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80735
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Tan, Yuan-Guo,Liu, Fang,Zhang, An-Wen,et al. Element Segregation and Solidification Behavior of a Nb, Ti, Al Co-Strengthened Superalloy & x42d;K151[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2019,32(10):1298-1308.
APA Tan, Yuan-Guo.,Liu, Fang.,Zhang, An-Wen.,Han, Da-Wei.,Yao, Xiao-Yu.,...&Sun, Wen-Ru.(2019).Element Segregation and Solidification Behavior of a Nb, Ti, Al Co-Strengthened Superalloy & x42d;K151.ACTA METALLURGICA SINICA-ENGLISH LETTERS,32(10),1298-1308.
MLA Tan, Yuan-Guo,et al."Element Segregation and Solidification Behavior of a Nb, Ti, Al Co-Strengthened Superalloy & x42d;K151".ACTA METALLURGICA SINICA-ENGLISH LETTERS 32.10(2019):1298-1308.
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