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Iranian Journal of Materials Science and Engineering، جلد ۵، شماره ۴، صفحات ۳۲-۳۹
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عنوان انگلیسی SIGMA PHASE FORMATION IN A HEAT TREATED NI-50CR COATING APPLIED BY HVOF PROCESS ON A STAINLESS STEEL
چکیده انگلیسی مقاله 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.
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نویسندگان مقاله j ساعدی | j saaedi
department of metallurgy and materials engineering, iran university of science andtechnology, tehran, iran


h عربی | h arabi
department of metallurgy and materials engineering, iran university of science and


sh میردامادی | sh mirdamadi


th w coyle | th w coyle
centre for advanced coating technologies, department of materials science and engineering,university of toronto, toronto, canada.university of toronto, toronto, canada.
نشانی اینترنتی http://ijmse.iust.ac.ir/browse.php?a_code=A-10-3-40&slc_lang=en&sid=en
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Research paper
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