Influence of microstructure on fatigue crack growth behavior of Ti–6Al–3Nb–2Zr–1Mo alloy: Bimodal vs. lamellar structures

doi:10.1016/j.intermet.2020.107058

CORC > 兰州理工大学 > 兰州理工大学 > 省部共建有色金属先进加工与再利用国家重点实验室

	Influence of microstructure on fatigue crack growth behavior of Ti–6Al–3Nb–2Zr–1Mo alloy: Bimodal vs. lamellar structures
	Ren, Junqiang 2; Wang, Qi 3; Zhang, Binbin 1; Yang, Dan 2; Lu, Xuefeng 2; Zhang, Xiaobo 2; Zhang, Xudong 4; Hu, Jingyu 3
刊名	Intermetallics
	2021-03-01
卷号	130
关键词	Computerized tomography Crack tips Fatigue crack propagation Lamellar structures Tensile strength Transmission electron microscopy Bi-modal structures Compact tension specimen Crack propagation path Cracks propagation Crystalline orientations Fatigue crack growth behavior Fatigue crack growth mechanism Prismatic dislocations
ISSN号	09669795
DOI	10.1016/j.intermet.2020.107058
英文摘要	The influence of microstructure (bimodal and lamellar structure) on the fatigue crack growth (FCG) rate of Ti–6Al–3Nb–2Zr–1Mo alloy was investigated using compact-tension (CT) specimens. The da/dN curves showed that the FCG rate of lamellar structure was slower than that of bimodal structure, especially in the early stage of crack growth. The FCG paths in the early stage were observed by optical microscopy and scan electric microscopy. The results revealed that the FCG paths of lamellar structure were more tortuous than that of bimodal structure. The frequency of crack deflection and bifurcation of the lamellar structure is significantly higher than that of bimodal structure. The dominant mode of crack propagation for bimodal structure is crossing βtrans and αp, and for lamellar structure is crossing α colonies. Fatigue crack growth mechanisms at the early stage have been studied by observation of crystalline orientation near the crack propagation path at the crack tip, in combination with the slip trace analyzing. The results show that the fatigue crack growth directions in αp or βtrans for bimodal structure and α colony for lamellar structure are mostly consistent with that of prismatic or basal plane trace. This indicated that the cracks propagation modes of crossing αp or βtrans in bimodal structure and crossing α colonies in lamellar structure are resulting from the slip band cracking of the microstructure at crack tip, as the evidence of {101‾0}112‾0 prismatic dislocation lines were observed in αp or βtrans for bimodal structure and α colony for lamellar structure by transmission electron microscope (TEM) near the fracture surface. © 2020 Elsevier Ltd
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/147173]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.Luoyang Ship Materials Research Institute, Luoyang; 471039, China; 2.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou; 730050, China; 3.Huanghuai University, Zhumadian; Henan; 463000, China; 4.Center for High Performance Computing, Network Information Center, Xi'an Jiaotong University, Xi'an; 710049, China
推荐引用方式 GB/T 7714	Ren, Junqiang,Wang, Qi,Zhang, Binbin,et al. Influence of microstructure on fatigue crack growth behavior of Ti–6Al–3Nb–2Zr–1Mo alloy: Bimodal vs. lamellar structures[J]. Intermetallics,2021,130.
APA	Ren, Junqiang.,Wang, Qi.,Zhang, Binbin.,Yang, Dan.,Lu, Xuefeng.,...&Hu, Jingyu.(2021).Influence of microstructure on fatigue crack growth behavior of Ti–6Al–3Nb–2Zr–1Mo alloy: Bimodal vs. lamellar structures.Intermetallics,130.
MLA	Ren, Junqiang,et al."Influence of microstructure on fatigue crack growth behavior of Ti–6Al–3Nb–2Zr–1Mo alloy: Bimodal vs. lamellar structures".Intermetallics 130(2021).