پديد آورنده :
لطفياني، مصطفي
عنوان :
بررسي علل و مكانيزم تخريب لوله هاي تشعشعي از جنس اينكونل 601 د ركوره هاي آنيل
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
ده، 99، [II]ص: مصور، جدول، نمودار
يادداشت :
ص.ع. به: فارسي و انگليسي
استاد راهنما :
محمود منير واقفي
استاد مشاور :
احمد ساعتچي
توصيفگر ها :
گالوانيزه گرم , كربوراسيون , آزمون اريكسون
تاريخ نمايه سازي :
07/03/87
استاد داور :
محمود مرآتيان، ابراهيم حشمت دهكردي
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت در نسخه ديجيتال
چكيده انگليسي :
AbstractRadiant tubes of a continuous annealing furnace at Mobarakeh Steel Company failed after afraction of service life The tubes have manufactured from INCONEL alloy 601 superalloy Inthis study a failure analysis of radiant tubes were performed by careful visual inspection ofthe failed tubes scanning electron microscopy observation of near crack region samples energy dispersive X ray spectroscopy and X ray diffractometer analysis of tube metals andoxide scales The temperature distribution for study state heat transfer and the structuralstresses induced by weight of tube material have studied in this paper Finite element method FEM has employed to compute the effect of temperature increasing on tube service life anddefine the critical regions Because of it is important to investigate the propagation method ofcreep cracking behavior Therefore in this article the Erickson machine employed to openingthe secondary cracks in a sample of the failed zone The creep crack propagation method hasstudied with scanning electron SEM fractography have used for study the fracture surfaces ofunfailed sample produced by tensile test Further more to evaluate the distribution of hardnessin samples micro hardness test has used The results showed that the cracks growth isoccurring in grain boundary precipitates Although the fracture surfaces of unfailed samplereveals ductile fracture Besides the experimental results of micro hardness test showed a highdifference between matrix and precipitates Due to cracks propagation occurred betweenductile matrixes and hard precipitates The experimental results showed that the mode of tube failure was a combination of creepdamage and high temperature oxidation attack leading to cracking Significant growth ofprecipitates of carbide has also observed in the failed zones which results in the drasticreduction of material ductility and propagation of creep cracking The simulation resultsshowed that damaged region in radiant tubes is susceptible to high temperature creep Tubefailure occurred because of bending in tube length that may be responsible for subsequent hot spots formation and high temperature oxidation and verified experimental results Moreover simulation displayed that modification in radian tube installation is necessary and utilization ofsupports in specific locations can be extended creep life Keywords failure radiant tube creep oxidation finite element method
استاد راهنما :
محمود منير واقفي
استاد مشاور :
احمد ساعتچي
استاد داور :
محمود مرآتيان، ابراهيم حشمت دهكردي
