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Precipitation and evolution of grain boundary boride in a nickel-based superalloy during thermal exposure
Du, Beining; Sheng, Liyuan; Cui, Chuanyong; Yang, Jinxia; Sun, Xiaofeng; Sheng, LY (reprint author), Peking Univ, Shenzhen Inst, Shenzhen 518057, Peoples R China.; Cui, CY (reprint author), Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
2017-06-01
Source PublicationMATERIALS CHARACTERIZATION
ISSN1044-5803
Volume128Pages:109-114
AbstractAs a grain boundary strengthening element, B is widely applied in most Ni-based superalloys. However, the added B prefer to interact with other elements near the grain boundary and form borides which would perform evolution during high temperature service, and then affect the grain boundary strength and mechanical properties of the superalloy. In the present research, a trace B doped nickel-based IN792 superalloy was fabricated and preheat treated as 1120 degrees C/2 h AC + 1080 degrees C/4 h AC (AC: air cooling) followed by thermal exposure at 750 degrees C, 845 degrees C, 900 degrees C and 950 degrees C for different times to investigate the precipitation and evolution of grain boundary M5B3 boride. The results indicate that M5B3 boride precipitates along the grain boundary at the early time of the thermal exposure of IN792 superalloy. When thermal exposed at different temperatures, the grain boundary M5B3 boride exhibits different evolution behavior. At 750 degrees C and 845 degrees C, M5B3 boride grows up gradually with the thermal exposure proceeding, and no phase transformation occurs. While at 900 degrees C and 950 degrees C, the grain boundary M5B3 boride precipitates at the early stage of the exposure process, and then transforms into M23C6 carbide as gray film with the increasing of the exposure time.; As a grain boundary strengthening element, B is widely applied in most Ni-based superalloys. However, the added B prefer to interact with other elements near the grain boundary and form borides which would perform evolution during high temperature service, and then affect the grain boundary strength and mechanical properties of the superalloy. In the present research, a trace B doped nickel-based IN792 superalloy was fabricated and preheat treated as 1120 degrees C/2 h AC + 1080 degrees C/4 h AC (AC: air cooling) followed by thermal exposure at 750 degrees C, 845 degrees C, 900 degrees C and 950 degrees C for different times to investigate the precipitation and evolution of grain boundary M5B3 boride. The results indicate that M5B3 boride precipitates along the grain boundary at the early time of the thermal exposure of IN792 superalloy. When thermal exposed at different temperatures, the grain boundary M5B3 boride exhibits different evolution behavior. At 750 degrees C and 845 degrees C, M5B3 boride grows up gradually with the thermal exposure proceeding, and no phase transformation occurs. While at 900 degrees C and 950 degrees C, the grain boundary M5B3 boride precipitates at the early stage of the exposure process, and then transforms into M23C6 carbide as gray film with the increasing of the exposure time.
description.department[du, beining] peking univ, beijing 100871, peoples r china ; [du, beining ; sheng, liyuan] peking univ, shenzhen inst, shenzhen 518057, peoples r china ; [cui, chuanyong ; yang, jinxia ; sun, xiaofeng] chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china
KeywordNi-based Superalloy Boride Carbide Grain Boundary Thermal Exposure
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
Funding OrganizationShenzhen Basic Research Project [JCYJ20160407090231002, JCYJ20150529162228734, JCYJ20150-625155931806, JCYJ20160427100211076]; Shenzhen Technology Innovation Plan [CXZZ20140731091722497, CXZZ20140419114548507]; China Postdoctoral Science Foundation [2015M580923]; Thirteen Five National Key Research and Development Plan [2016YFC1102601]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78097
Collection中国科学院金属研究所
Corresponding AuthorSheng, LY (reprint author), Peking Univ, Shenzhen Inst, Shenzhen 518057, Peoples R China.; Cui, CY (reprint author), Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Du, Beining,Sheng, Liyuan,Cui, Chuanyong,et al. Precipitation and evolution of grain boundary boride in a nickel-based superalloy during thermal exposure[J]. MATERIALS CHARACTERIZATION,2017,128:109-114.
APA Du, Beining.,Sheng, Liyuan.,Cui, Chuanyong.,Yang, Jinxia.,Sun, Xiaofeng.,...&Cui, CY .(2017).Precipitation and evolution of grain boundary boride in a nickel-based superalloy during thermal exposure.MATERIALS CHARACTERIZATION,128,109-114.
MLA Du, Beining,et al."Precipitation and evolution of grain boundary boride in a nickel-based superalloy during thermal exposure".MATERIALS CHARACTERIZATION 128(2017):109-114.
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