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Creep Characteristics of Ti-6Al-4V Alloy Surface Modified by Plasma Carburized/CrN Coating  

Park, Yong-Gwon (Department of Materials Engineering, Chungbuk National University)
Park, Jung-Ung (Division of Advanced Materials Engineering, Kongju National University)
Wey, Myeong-Yong (Department of Materials Engineering, Chungbuk National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.18, no.3, 2005 , pp. 183-189 More about this Journal
Abstract
The effects of duplex-treatment of plasma carburization and CrN coating onto Ti-6Al-4V alloy on its creep properties were investigated by means of a constant stress creep tester. Applying duplex-treatment, specimens having an inner carburized layer of about $150{\mu}m$ in depth and outer CrN layer of about $7.5{\mu}m$ in thickness were prepared. The hardness of duplex-treatment surface was about 1,960 VHN. It also appeared that the duplex-treatment improved the roughness of the surface significantly; $Ra=0.045{\mu}m$ for treated alloy while $Ra=0.321{\mu}m$ for untreated alloy. The steady-state creep behaviors were investigated in a temperature range of $510{\sim}550^{\circ}C$ ($0.42{\sim}0.44T_m$) under an applied stress range of 200~275 MPa. The stress exponent, n, was derived assuming the power law creep behavior. The surface treatment showed a decrease in a value from 9.32 (untreated) to 8.79 (treated). Also the activation energy obtained from an Arrhenius plot increased from 238 to 257 kJ/mol.
Keywords
Ti-6Al-4V alloy; Plasma-carburizing; CrN coating; Stress exponent; Activation energy;
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Times Cited By KSCI : 1  (Citation Analysis)
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