Record Details

Molecular dynamics simulation of nanoindentation of Fe3C and Fe4C

DSpace at IIT Bombay

View Archive Info
 
 
Field Value
 
Title Molecular dynamics simulation of nanoindentation of Fe3C and Fe4C
 
Creator GOEL, S
JOSHI, SS
ABDELAL, G
AGRAWAL, A
 
Subject MD simulation
Steel
Nanoindentation
Cementite
Fe3C
Fe4C
QUANTITATIVE ASSESSMENT
MECHANICAL-PROPERTIES
SILICON-CARBIDE
MD SIMULATION
ATOMIC-SCALE
INDENTATION
STATE
STABILITY
CARBON
IRON
 
Description Study of nanomechanical response of iron carbides is important because presence of iron carbides greatly influences the performance and longevity of steel components. This work contributes to the literature by exploring nanoindentation of Fe3C and tetrahedral-Fe4C using molecular dynamics simulation. The chemical interactions of iron and carbon were described through an analytical bond order inter-atomic potential (ABOP) energy function. The indentations were performed at an indentation speed of 50 m/s and a repeat trial was performed at 5 m/s. Load-displacement (P-h) curve for both these carbides showed residual indentation depth and maximum indentation depth (h(f)/h(max)) ratio to be higher than 0.7 i.e. a circumstance where Oliver and Pharr method was not appropriate to be applied to evaluate the material properties. Alternate evaluation revealed Fe3C to be much harder than Fe4C. Gibbs free energy of formation and radial distribution function, coupled with state of the average local temperature and von Mises stresses indicate the formation of a new phase of iron-carbide. Formation of this newer phase was found to be due to deviatoric strain rather than the high temperature induced in the substrate during nanoindentation. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE SA
 
Date 2014-12-28T17:11:33Z
2014-12-28T17:11:33Z
2014
 
Type Article
 
Identifier MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 597331-341
0921-5093
1873-4936
http://dx.doi.org/10.1016/j.msea.2013.12.091
http://dspace.library.iitb.ac.in/jspui/handle/100/16970
 
Language English