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Iranian Journal of Materials Science and Engineering، جلد ۲، شماره ۲، صفحات ۹-۱۵
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عنوان انگلیسی THE KINETIC OF PRECIPITATION REACTIONS IN A RAPIDLY AGED HIGH ALLOY HIGH STRENGTH STEEL
چکیده انگلیسی مقاله This study was launched to investigate the effects of heating rate and aging parameters on the kinetic of precipitation reactions in a high alloy high strength steel having Ni, Co, Mo and Ti. For this purpose, as quenched specimens were subjected to three types of aging methods with different heating rates. These methods consisted of aging in Pb bath, salt bath, and furnace at different aging cycles. The kinetic of precipitation in each method was studied by hardness measurements and was described adequately by the Johnson-mehl-Avrami equation. Remarkable increase in hardness and its rate is observed when the rate of heating increases. The substantial increase in hardness of the specimens aged rapidly in salt & Pb baths, compared with those aged normally in furnace, seemed to be due to the formation of thermo elastic stresses during sudden expansion of the substance subjected to rapid heating. According to the results obtained in this research, increase in the Avrami constants, n & k, and decrease in the start time of transformation, ts, are associated with heating rate increasing. Analysis of the observed and calculated data for hardness using Arrhenius equation, shows that for the same amount of volume fraction of precipitates, the activation energy of precipitates decreased for f=25 and 50%, while at f=90 % it increased by increasing heating rate.
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نویسندگان مقاله مرکباتی m | morakabati m
advance materials research center amrc , department of metallurgy and materials engineering, iran university of science and technology, narmak, tehran, iran

سازمان اصلی تایید شده: دانشگاه علم و صنعت ایران (Iran university of science and technology)

عربی h | arabi h
advance materials research center amrc , department of metallurgy and materials engineering, iran university of science and technology, narmak, tehran, iran

سازمان اصلی تایید شده: دانشگاه علم و صنعت ایران (Iran university of science and technology)

میردامادی sh | mirdamadi sh


عباسی s m | abbasi s m


نشانی اینترنتی http://ijmse.iust.ac.ir/browse.php?a_code=A-10-1-33&slc_lang=fa&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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