Imperial College London
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Dr Sam Humphry-Baker

Faculty of Engineering, Department of Materials

Lecturer in Ceramics
 
 
 
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Contact

 

s.humphry-baker

 
 
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Location

 

LM.04DRoyal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Humphry-Baker:2021:10.1016/j.ijrmhm.2020.105462,
author = {Humphry-Baker, S and Vandeperre, L},
doi = {10.1016/j.ijrmhm.2020.105462},
journal = {International Journal of Refractory Metals and Hard Materials},
pages = {1--8},
title = {Creep deformation of WC hardmetals with iron-based binders},
url = {http://dx.doi.org/10.1016/j.ijrmhm.2020.105462},
volume = {95},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Iron is a candidate to replace cobalt in WC hardmetals, due to its lower cost and toxicity. A WC-FeCrhardmetal was compression tested at 900-1200 °C. Particular attention is paid to the steady-state creeprates and stress-exponents (n) during isostress treatments. Three regimes of n are observed. Two ofthese were previously reported for WC-Co: power law creep (n»3) at stresses below ~100MPa; andgrain boundary sliding (n»1) at higher stresses. A previously unreported regime at very low stresses(<10MPa), with an exponent of n»2, is also observed. By combining electron microscopy with X-raydiffraction texture measurements, the low stress regime is attributed to viscous flow of the binder,which is accommodated by diffusional creep in the WC skeleton. The mechanism may be applicableto other hardmetals. Compared to analogous WC-Co materials, WC-FeCr shows improved creepresistance below 1000 °C, which can be explained by its lower self-diffusivity, and a lower solubilityfor WC than Co. However, at temperatures corresponding to liquid eutectic formation (~1140 °C), itscreep resistance becomes inferior. These results indicate FeCr may be a suitable replacement for Coprovided the eutectic temperature is not exceeded.
AU  - Humphry-Baker,S
AU  - Vandeperre,L
DO  - 10.1016/j.ijrmhm.2020.105462
EP  - 8
PY  - 2021///
SN  - 0263-4368
SP  - 1
TI  - Creep deformation of WC hardmetals with iron-based binders
T2  - International Journal of Refractory Metals and Hard Materials
UR  - http://dx.doi.org/10.1016/j.ijrmhm.2020.105462
UR  - https://www.sciencedirect.com/science/article/pii/S0263436820303383?via%3Dihub
UR  - http://hdl.handle.net/10044/1/85039
VL  - 95
ER  -
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