Fracture behavior of Inconel 718 sheet in thermal-aided deformation considering grain size effect and strain rate influence
点击次数：
DOI码：10.1016/j.matdes.2017.05.089
发表刊物：Materials & Design
关键字：Inconel 718; Fracture behavior; Grain size effect; Strain rate influence; Inclusion influence.
摘要：In this paper, the fracture behavior of Inconel 718 sheets in thermal-aided deformation processes is elucidated, accompanied by high-temperature fracture photography analysis, considering the effect of grain size and strain rate. Uniaxial tests were conducted under varied test conditions. A segmentation phenomenon was observed in the Hall-Petch curves for the fracture stress at lower strain rates, which disappeared at higher strain rates. Moreover, the fracture strain is predicted by the Cockcroft & Latham criterion with a modified Voce constitutive model. Based on the fracture photographs acquired by scanning electron microscopy (SEM), a two-step fracture mechanism was proposed and shown for Inconel 718 thin sheets. Furthermore, thin sheet fracture was found to be influenced by inclusions, which was verified by CAE simulations. This article thus provides an in-depth discussion of fracture behavior of Inconel 718 thin sheets, which was influenced by the comprehensive effects of the grain size distribution, strain rate influence, local element composition, and the second-phase particles or inclusions.
合写作者：X.J. Li,M. Wan,B. Meng,Z.Y. Cai
第一作者：R. Zhao
论文类型：期刊论文
通讯作者：J.Q. Han
学科门类：工学
文献类型：J
卷号：130
页面范围：413-425
ISSN号：0264-1275
是否译文：否
发表时间：2017-05-30
收录刊物：SCI