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Properties of Electrospark Deposited Cr Coatings on AISI H13 Steel

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Abstract:

Cr coatings were deposited on AISI H13 steel substrates by means of electrospark deposition (ESD). The coatings were characterized in terms of their microstructure, hardness, friction and wear behavior and high-temperature oxidation resistance. Micro-indentation and tribometer testers were employed to measure the mechanical properties of Cr coatings and AISI H13 steel. The results showed that the hardness of the coatings ranged from 600 to 660 HV, with a higher value than that of AISI H13 steel (510 HV). The coefficient of steady-state friction of the coatings against 45-carbon-steel balls ranged from 0.23 to 0.27, with a lower value than that of AISI H13 steel (0.62-0.68). The isothermal oxidation behavior of the coatings at 850°Cwas studied in comparison with AISI H13 steel substrates. The results indicated that Cr coatings substantially increase the high-temperature oxidation resistance of AISI H13 steel and the oxidation process was retarded mainly by the presence of a Cr2O3 oxide scale on the coatings at 850°C for 100 hours.

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Advanced Manufacturing Technology, ICMSE 2012 View Preview

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Periodical:

Advanced Materials Research (Volumes 472-475)

Pages:

288-292

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.472-475.288

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Online since:

February 2012

Authors:

Cean Guo, Jian Zhang, Li Yang, Wei Zhou, Hong Hui Sun

Keywords:

Cr Coatings, Electrospark Deposition, Friction and Wear Behavior, Hardness, High Temperature Oxidation Resistance

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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