Texture Evolution and Dislocation Behavior in a Nickel‐Based Superalloy during Hot Compression

Abstract

Texture evolution and dislocation behavior of Ni‐based superalloys at various temperatures and strain rate of 1 s−1 are studied using electron backscatter diffraction (EBSD) technique and transmission electron microscope (TEM). It can be concluded that no significant texture is formed at high deformation temperature, especially for the occurrence of completed dynamic recrystallization (DRX). In addition, texture weakening is easy to realize by conducting DRX process on the Ni‐based superalloys, whereas a slight strengthening is observed during grain growth. Based on the TEM images, the original grain boundary with high orientation gradient at low temperature provides an excellent position for DRX nuclei, which is strongly related with the dislocation motion. Moreover, it is concluded that the dislocation behavior plays a significant role in the plastic deformation of the Ni‐based superalloys. Herein, theoretical guidance for the application of nickel‐based superalloys and furthermore enhancement of their plastic deformation properties is provided.

Anisotropic Behaviours of Lpbf Hastelloy X Under Slow Strain Rate Tensile Testing at Elevated Temperature

“…GOSS texture with elongated grain structure and high dislocation density in LPBF HX show similarity with rolled materials [74][75][76]. The high dislocation density in rolled materials promotes dynamic recrystallization when heat treatment is applied, and the dynamic recrystallization further leads to texture evolution, specifically forming Goss component.…”

Hot Deformation Behavior of a Powder Metallurgy Superalloy with High γ′ Content

“…At minimal strain, the work hardening exceeded the flow softening mechanism of DRV, manifested by the increasing dislocations and subgrains. [ 26 ] Typically, the softening effect of DRV is insufficient to offset work hardening, especially for alloys with low stacking fault energy; thus, stress increased sharply. [ 27 ] The dislocation density increased with strain until the critical strain point, and then, DRX was activated.…”

“…Then, n was calculated to be 3.1873 using n ¼ ∂lnε : ∂ln½sinhðασÞ , and Q was calculated to be 894. 26…”

The Effect of the Strain Rate on the Fretting Wear Properties of Thermally Compressed Inconel 625 Alloy

“…The detailed evolution of the microstructure and mechanism of Inconel 625 can be found in the existing literature. [1,22] The preceding information indicates that when the strain rates were 0.1 and 1 s À1 , the thermally compressed Inconel 625 not only had higher hardness and www.advancedsciencenews.com www.aem-journal.com better plasticity, but also a lower friction coefficient and better wear resistance. The characteristics of the wear surface and materials of the thermally compressed Inconel 625 were analyzed.…”

“…Thermal deformation is accompanied by work hardening, recovery, and recrystallization, which affect the grain size, crystal orientation, and grain boundaries. [1] The strain rate and temperature are two of the most important parameters that determine plastic deformation. Inconel 625 alloy is a solid solution-enhanced nickel-based wrought superalloy with a face-centered cubic structure.…”