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INFLUENCE OF TEMPERATURE ON TENSILE BEHAVIORS OF K416B Ni-BASED SUPERALLOY WITH HIGH W CONTENT
Xie Jun; Yu Jinjiang; Sun Xiaofeng; Jin Tao; Yang Yanhong
Corresponding AuthorYu Jinjiang(jjyu@imr.ac.cn)
2015-08-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:8Pages:943-950
AbstractNi-based superalloys with high content of W are often used to manufacture gas turbine vanes and high temperature forging dies due to high temperature capability and low cost. The microstructure of Ni-based superalloys consists of gamma matrix, gamma' phase and carbides generally. The deformation mechanisms of alloy mainly include dislocation loops formation, shearing of dislocation into gamma' phase and formation of anti-phase boundary (APB) and stacking fault. Although the deformation mechanism of Ni-based superalloys has been studied widely, the relationship between tensile property and deformation mechanism of K416B superalloy at different temperature is still unclear up to now. Therefore, the influence of temperature on tensile behaviors of K416B Ni-based superalloy with high W content was investigated in the present work by means of tensile test at different temperatures. It has been found that the yield and tensile strengths of K416B alloy increase with rising temperature at 20 similar to 800 degrees C. When the temperature exceeds 800 degrees C, the tensile property of the alloy decreases gradually. The deformation feature of the alloy during tensile test at room temperature is that the dislocations shear into gamma' phase or cross gamma' phase by Orowan mechanism. As the dislocations shear into gamma' phase, they decompose to form the stacking fault. The dislocation density in the matrix of the alloy increases with the rising temperature and the dislocation tangles in the matrix play the role of strengthening in the alloy during tensile test at 800 degrees C. As the temperature further enhancing, the amount of dislocations shearing into gamma' phase increases and then the tensile strength of the alloy decreases. Under the condition of middle-low temperature, the brittle fracture occurs in the alloy due to the fact that the cracks are initiated and propagated along M6C carbide with large size. During tensile test at high temperatures, the tensile fracture mode of the alloy is micro-porous aggregation along the gamma+gamma' eutectic interface, which is the main reason for the alloy exhibiting the ductile fracture.
KeywordK416B Ni-based superalloy tensile behavior deformation feature fracture mechanism
Funding OrganizationNational Basic Research Program of China ; National Natural Science Foundation of China
Indexed BySCI
Language英语
Funding ProjectNational Basic Research Program of China[2010CB631200] ; National Basic Research Program of China[2010CB631206] ; National Natural Science Foundation of China[50931004]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000359683900007
PublisherSCIENCE PRESS
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/120568
Collection中国科学院金属研究所
Corresponding AuthorYu Jinjiang
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Xie Jun,Yu Jinjiang,Sun Xiaofeng,et al. INFLUENCE OF TEMPERATURE ON TENSILE BEHAVIORS OF K416B Ni-BASED SUPERALLOY WITH HIGH W CONTENT[J]. ACTA METALLURGICA SINICA,2015,51(8):943-950.
APA Xie Jun,Yu Jinjiang,Sun Xiaofeng,Jin Tao,&Yang Yanhong.(2015).INFLUENCE OF TEMPERATURE ON TENSILE BEHAVIORS OF K416B Ni-BASED SUPERALLOY WITH HIGH W CONTENT.ACTA METALLURGICA SINICA,51(8),943-950.
MLA Xie Jun,et al."INFLUENCE OF TEMPERATURE ON TENSILE BEHAVIORS OF K416B Ni-BASED SUPERALLOY WITH HIGH W CONTENT".ACTA METALLURGICA SINICA 51.8(2015):943-950.
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