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Materials 2017, 10(12), 1392;

Anneal-Hardening Behavior of Cr-Fe-C Alloy Deposits Prepared in a Cr3+-Based Bath with Fe2+ Ions

Department of Mechanical Engineering, Chang Gung University, Taoyuan 333, Taiwan
Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei 243, Taiwan
Bone and Joint Research Center, Chang Gung Memorial Hospital, Taoyuan 333, Taiwan
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 26 November 2017 / Accepted: 27 November 2017 / Published: 5 December 2017
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Cr-Fe-C alloy deposits were successfully prepared on high-carbon tool steel in a Cr3+-based electroplating bath containing Fe2+ ions and suitable complex agents. A Cr-based alloy deposit was obtained with an electroplating current density higher than 25 Adm−2, and a Fe-based alloy deposit was obtained using a current density of 20 Adm−2. Following electroplating, these alloy deposited specimens were annealed via rapid thermal annealing (RTA) at 500 °C for different periods up to 30 s. The experimental results show that Cr- and Fe-based alloy deposits could be significantly hardened after RTA at 500 °C for a few seconds. The maximum hardness was that of the Cr-Fe-C alloy deposit annealed at 500 °C for 10 s. The maximum hardness of 1205 Hv was detected from the annealed Cr-based alloy deposit prepared with 30 ASD. The hardening mechanism of annealed Cr- and Fe-based alloy deposits is attributed to the precipitation of C-related membranes. The hardness values of the annealed Cr- and Fe-based alloy deposits increase with the increasing degree of crystallization of the C-related membranes. View Full-Text
Keywords: trivalent Cr electroplating; annealing; microstructure; hardening mechanism trivalent Cr electroplating; annealing; microstructure; hardening mechanism

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Huang, C.A.; Chen, J.Y.; Wang, H.; Lai, P.L. Anneal-Hardening Behavior of Cr-Fe-C Alloy Deposits Prepared in a Cr3+-Based Bath with Fe2+ Ions. Materials 2017, 10, 1392.

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