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Influence of gamma ' precipitates on Portevin-Le Chatelier effect of NI-based superalloys
Cai, Yulong; Tian, Chenggang; Fu, Shihua; Han, Guoming; Cui, Chuanyong; Zhang, Qingchuan; fushihua@ustc.edu.cn; chycui@imr.ac.cn; zhangqc@ustc.edu.cn
2015
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume638Pages:314-321
AbstractThe gamma ' precipitate plays a critical role in improving the mechanical properties of Ni-based superalloys. An undesirable phenomenon referred to as the Portevin-Le Chatelier (PLC) effect always appears in Ni-based superalloys deformed within specific ranges of strain rate and temperature. In order to systematically investigate the influence of the gamma ' precipitates on the PLC effect, four Ni-based superalloys with various gamma ' contents were designed and fabricated. Microscopic observations from transmission electron microscopy (TEM) indicated that the volume fraction of the gamma ' phase was consistent with the designed value. Furthermore, analysis of energy dispersive spectroscopy (EDS) results revealed that the gamma matrix of all the alloys consisted of the same components. Uniaxial tensile tests were performed at strain rates and temperatures ranging from 1 x 10(-4) to 3 x 10(-3) s(-1) and 300-500 degrees C, respectively. We found that the ultimate strength increased while the elongation decreased with increasing gamma ' content. In addition, the serration changed from type A to type B and to type C with increasing temperature, decreasing strain rate or increasing gamma ' content; the amplitude of type B serrations was described by unimodal or bimodal distributions. Increasing volume fraction of gamma ' precipitates shifted the region in which the PLC effect occurred, to the range of low temperatures and high strain rates. Moreover, the serration amplitude increased with increasing gamma ' content at a given temperature, which indicated that the gamma ' precipitate increases the dynamic strain ageing (DSA) effect. (C) 2015 Elsevier B.V. All rights reserved.
description.department[cai, yulong ; tian, chenggang ; han, guoming ; cui, chuanyong] chinese acad sci, inst met res, shenyang 110016, peoples r china ; [cai, yulong ; fu, shihua ; zhang, qingchuan] univ sci & technol china, cas key lab mech behav & design mat, hefei 230027, peoples r china
KeywordGamma ' Precipitate Gamma ' Content Ni-based Superalloy Dynamic Strain Ageing Portevin-le Chatelier Effect
Funding OrganizationNational Natural Science Foundation of China (NSFC) [11332010, 51271174, 11372300]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74915
Collection中国科学院金属研究所
Corresponding Authorfushihua@ustc.edu.cn; chycui@imr.ac.cn; zhangqc@ustc.edu.cn
Recommended Citation
GB/T 7714
Cai, Yulong,Tian, Chenggang,Fu, Shihua,et al. Influence of gamma ' precipitates on Portevin-Le Chatelier effect of NI-based superalloys[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2015,638:314-321.
APA Cai, Yulong.,Tian, Chenggang.,Fu, Shihua.,Han, Guoming.,Cui, Chuanyong.,...&zhangqc@ustc.edu.cn.(2015).Influence of gamma ' precipitates on Portevin-Le Chatelier effect of NI-based superalloys.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,638,314-321.
MLA Cai, Yulong,et al."Influence of gamma ' precipitates on Portevin-Le Chatelier effect of NI-based superalloys".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 638(2015):314-321.
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