Micromechanical Behavior of Single-Crystal Superalloy with Different Crystal Orientations by Microindentation. (27th April 2015)

• Record Type: Journal Article
• Authors: Li, Jinghui; Li, Fuguo; Dong, Junzhe; Yuan, Zhanwei; Zhang, Shuo
• Other Names: Jian Sheng-Rui Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2015(2015)
• Publication Date: 2015-04-27
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2015/759753
• Languages: English
• ISSNs: 1687-4110

Abstract

Abstract : In order to investigate the anisotropic micromechanical properties of single-crystal nickel-based superalloy DD99 of four crystallographic orientations, (001), (215), (405), and (605), microindentation test (MIT) was conducted with different loads and loading velocities by a sharp Berkovich indenter. Some material parameters reflecting the micromechanical behavior of DD99, such as microhardness H, Young's modulus E, yield stress σ y, strain hardening component n, and tensile strength σ b, can be obtained from load-displacement relations. H and E of four different crystal planes evidently decrease with the increase of h . The reduction of H is due to dislocation hardening while E is related to interplanar spacing and crystal variable. σ y of (215) is the largest among four crystal planes, followed by (605), and (001) has the lowest value. n of (215) is the lowest, followed by (605), and that of (001) is the largest. Subsequently, a simplified elastic-plastic material model was employed for 3D microindentation simulation of DD99 with various crystal orientations. The simulation results agreed well with experimental, which confirmed the accuracy of the simplified material model.