Volume 5, Issue 4 (Autumn 2008 2008)                   IJMSE 2008, 5(4): 32-39 | Back to browse issues page

XML Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

J. Saaedi, H. Arabi, Sh. Mirdamadi, Th. W. Coyle. SIGMA PHASE FORMATION IN A HEAT TREATED NI-50CR COATING APPLIED BY HVOF PROCESS ON A STAINLESS STEEL. IJMSE 2008; 5 (4) :32-39
URL: http://ijmse.iust.ac.ir/article-1-149-en.html
Abstract:   (46217 Views)
Abstract: Two different coating microstructures of Ni-50Cr alloy were obtained on a stainless steel substrate by changing combustion characteristics of a high velocity oxy-fuel (HVOF) process and the size distribution of feed powder during coating process. Use of the finer feed powder and leaner fuel in oxygen/fuel ratio (i.e. using a ratio much less than stoichiometric ratio) led to formation of an extremely dense coating with high oxide content. Heat treating of this coating at 650ºC for 4 hours caused the formation of an intermetallic sigma phase having Cr7Ni3 stoichiometry. Formation of this phase has been reported occasionally in thin films not in thermal spray coatings, as reported for the first time in this research. In addition no sigma phase was detected in the HVOF as-deposited coating with low oxide content after heat treatment of the samples. Therefore, due to the limited number of papers available in the subject of formation of phase in either Ni-Cr bulk alloys or coatings, it is considered appropriate to show up a case in this field. In this work, the formation of sigma phase in Ni-50Cr coating deposited by HVOF technique and heat treated at 650ºC was discussed and then the coating was characterized.
     
Type of Study: Research Paper |

Add your comments about this article : Your username or Email:
CAPTCHA

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

© 2022 All Rights Reserved | Iranian Journal of Materials Science and Engineering

Designed & Developed by : Yektaweb