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EFFECT OF Re AND W ON RECRYSTALLIZATION OF AS-CAST Ni-BASED SINGLE CRYSTAL SUPERALLOYS
Pu Sheng1,2; Xie Guang2,3; Wang Li2,3; Pan Zhiyi3,4; Lou Langhong2
Corresponding AuthorXie Guang(gxie@imr.ac.cn)
2016-05-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:5Pages:538-548
AbstractNi-based single crystal (SX) superalloys have been used as blades in aero-space industry and land based applications due to their excellent high-temperature properties. However, residual strain is introduced into as cast SX superalloy blades during the manufacturing process, such as casting, grinding or shot peening, and so on. Recrystallization (RX) occurs easily during subsequent high temperature heat treatment. In previous work, it is believed that RX has detrimental effect on the mechanical properties of SX superalloy. Furthermore, in order to improve the mechanical properties, more and more refractory elements, such as W, Re, Mo, Ta, are added into SX superalloys. However, so far, few reports about the effect of refractory elements on the RX in as-cast SX superalloys have been available. In the present work, the effect of Re and W on the RX behavior of as-cast Ni-based SX superalloy was studied. Single crystal superalloys with different Re and W contents were annealed at 1230 similar to 1330 degrees C after indened using Brinell hardnesstester. It is found that RX grains form at the surface under indentation and grow preferentially along the dendritic cores. Subsequent growth of RX is impeded by the residual coarse gamma' and gamma+gamma' eutectics in the interdendritic regions. Both the volume fraction of gamma+gamma' eutectics and gamma' solvus temperature are increased with the addition of Re and W, which are attributed to the increase of RX threshold temperature. For all SX superalloys studied in this work, RX area increases with the increase of annealing temperature due to the dissolution of gamma' and gamma+gamma' eutectics. At the same annealing temperature, in comparison to Re, W shows more effect to inhibit RX growth. Additionally, SX superalloy containing both Re and W has the smallest RX area in the present experiments.
KeywordNi-based single crystal superalloy recrystallization eutectic Re W
DOI10.11900/0412.1961.2015.00456
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000376471100004
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/122241
Collection中国科学院金属研究所
Corresponding AuthorXie Guang
Affiliation1.Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
4.Tsinghua Univ, Grad Sch Shenzhen, Shenzhen 518055, Peoples R China
Recommended Citation
GB/T 7714
Pu Sheng,Xie Guang,Wang Li,et al. EFFECT OF Re AND W ON RECRYSTALLIZATION OF AS-CAST Ni-BASED SINGLE CRYSTAL SUPERALLOYS[J]. ACTA METALLURGICA SINICA,2016,52(5):538-548.
APA Pu Sheng,Xie Guang,Wang Li,Pan Zhiyi,&Lou Langhong.(2016).EFFECT OF Re AND W ON RECRYSTALLIZATION OF AS-CAST Ni-BASED SINGLE CRYSTAL SUPERALLOYS.ACTA METALLURGICA SINICA,52(5),538-548.
MLA Pu Sheng,et al."EFFECT OF Re AND W ON RECRYSTALLIZATION OF AS-CAST Ni-BASED SINGLE CRYSTAL SUPERALLOYS".ACTA METALLURGICA SINICA 52.5(2016):538-548.
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