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Materials 2017, 10(12), 1392; https://doi.org/10.3390/ma10121392

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

1
Department of Mechanical Engineering, Chang Gung University, Taoyuan 333, Taiwan
2
Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei 243, Taiwan
3
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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Abstract

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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