Influence of gamma ' precipitates on Portevin-Le Chatelier effect of NI-based superalloys

IMR OpenIR

	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
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	638 页码:314-321
摘要	The 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.
部门归属	[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
关键词	Gamma ' Precipitate Gamma ' Content Ni-based Superalloy Dynamic Strain Ageing Portevin-le Chatelier Effect
资助者	National Natural Science Foundation of China (NSFC) [11332010, 51271174, 11372300]
收录类别	sci
语种	英语
WOS记录号	WOS:000356735400037
引用统计	被引频次：58[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/74915
专题	中国科学院金属研究所
通讯作者	fushihua@ustc.edu.cn; chycui@imr.ac.cn; zhangqc@ustc.edu.cn
推荐引用方式 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.