Abstract
Precipitation of fine chromium carbides have been considered to be the hardening mechanism of the anneal-hardened Cr-C deposit for a long time. However, according to this study, precipitation of carbon-based membranes may servethe hardening mechanism for annealed Cr-C deposit. The carbon-based membranes could be extracted from as-plated and annealed Cr-C deposits byetching in a solution of33 vol.% HNO3+67 vol.% HCl. The structure of carbon-based membrane transforms from an amorphous carbon to a crystalline diamond-like structure with increasing the annealing temperatures. This leads to obvious increasein the hardness of annealed Cr-C deposits. Based on this mechanism, a hardened surface on Cr-C deposited steel specimens could be achieved by using reduction-flame heating for a short period (~1 s).
Original language | English |
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Pages (from-to) | 3461-3466 |
Number of pages | 6 |
Journal | Surface and Coatings Technology |
Volume | 205 |
Issue number | 11 |
DOIs | |
State | Published - 25 02 2011 |
Keywords
- Carbon-based membrane
- Chromium-carbon (Cr-C) deposit
- Hardening mechanism