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Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase
Hou, Kunlei1,2; Wang, Min1,3; Zhao, Peng1,2; Ou, Meiqiong1,3; Li, Haoze1,3; Ma, Yingche1,3; Liu, Kui1,3
Corresponding AuthorMa, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
2022-06-05
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume905Pages:10
AbstractThis study investigates the temperature-dependent yield strength and deformation mechanism of a new casting Ni-based superalloy K4750. This alloy exhibits yield strength anomaly (YSA) at 650-750 degrees C though it contains only low volume-fraction gamma ' phase (22%). Using the interrupted samples after ~1.0% plastic strain, the dominant deformation mechanisms at the initial yielding stage are identified as: (i) (anti-phase boundary)APB-coupled dislocation pairs shearing gamma ' from room temperature to 650 degrees C, (ii) dislocations bypassing gamma ' and creating loops above 650 degrees C, and (iii) dislocations overcome gamma ' by the thermally activated cross-slip and local climb at 850 degrees C. Additionally, with the proceeding of deformation, superlattice stacking faults shearing is active above 750 degrees C, implying that the deformation mechanism changes as the deformation progresses. According to the theoretical calculation, the critical resolved shear stress of Orowan looping decreases faster than APB shearing with the temperature increase, which is in agreement with the observed transition of deformation mechanism. Moreover, the remaining loops hinder the movement of subsequent dislocations, resulting in severe dislocation entanglement and high dislocation density in the heterogeneous slip bands, contributing to YSA. By contrast, dislocations can easily surmount gamma ' phase by cross-slip and climb at 850 degrees C, leading to a rapid degradation of yield strength.(c) 2022 Elsevier B.V. All rights reserved.
KeywordNi-based superalloy Temperature effect Yield strength anomaly Deformation mechanism Orowan looping
Funding OrganizationNational Natural Science Foundation of China ; China Postdoctoral Science Foundation ; National Major Science and Technology Projects of China
DOI10.1016/j.jallcom.2022.164187
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[52001314] ; China Postdoctoral Science Foundation[2020M671403] ; National Major Science and Technology Projects of China[J2019-VI-0004-0118] ; National Major Science and Technology Projects of China[J2019-VII-0002-0142]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000779681700003
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/172825
Collection中国科学院金属研究所
Corresponding AuthorMa, Yingche; Liu, Kui
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.IMR NMSA, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Hou, Kunlei,Wang, Min,Zhao, Peng,et al. Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,905:10.
APA Hou, Kunlei.,Wang, Min.,Zhao, Peng.,Ou, Meiqiong.,Li, Haoze.,...&Liu, Kui.(2022).Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase.JOURNAL OF ALLOYS AND COMPOUNDS,905,10.
MLA Hou, Kunlei,et al."Temperature-dependent yield strength and deformation mechanism of a casting Ni-based superalloy containing low volume-fraction gamma ' phase".JOURNAL OF ALLOYS AND COMPOUNDS 905(2022):10.
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