Journal Article

Mechanical characteristics of WC-Co polycrystalline under local E-beam irradiation via molecular dynamics simulations

Yi, Taeil

2024

Overview

A machining tool plays a crucial role in determining the quality of products produced through cutting or abrasive machining. The tool must have exceptional thermal and mechanical properties to produce acceptable results. The tungsten carbide with cobalt binder is a well-regarded composite material commonly used in machining tools due to its ability to meet these requirements. Research has been conducted to improve the performance of these tools, and one method is the electron beam (e-beam) treatment, which enhances the tool’s strength by exposing it to a high-energy beam. Experimental methods are often used to understand the phase transformation in alloys, but the evolution of nanoscale polycrystalline structures is yet to be fully explored. Thus, we employ molecular dynamics simulations to investigate the effect of e-beam irradiation by calculating the mechanical properties of cobalt, tungsten carbide, and tungsten carbide with cobalt binder nanocrystalline structures after undergoing e-beam irradiation treatment at different temperatures and elongation conditions. This study starts to verify the potential model by comparing melting points with experiments. Then, indentation simulations are introduced to demonstrate the relationship between normalized hardness and recovery index systematically on a free surface. Finally, the study provides qualitative observations of three different WC-Co polycrystalline structures to highlight the effect of nanosized grain distributions. Both indentation and tensile simulations analyze the structural instability based on the averaged local. This research sheds light on the underlying physics of thermal and e-beam treatments on mono and polycrystalline nanostructures.

• Publisher: Korean Society of Mechanical Engineers,Springer Nature B.V,대한기계학회
• Subject: Abrasive cutting / Abrasive machining / Cemented carbides / Cobalt / Composite materials / Control / Dynamical Systems / Electron beams / Elongated structure / Engineering / Free surfaces / Indentation / Industrial and Production Engineering / Irradiation / Mechanical Engineering / Mechanical properties / Melting points / Molecular dynamics / Original Article / Phase transitions / Polycrystals / Simulation / Structural stability / Thermodynamic properties / Tungsten carbide / Vibration / 기계공학