4865

4569

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1388

ده،130ص.:مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

احمد كرمانپور، محمد علي گلعذار

30/9/88

فخرالدين اشرفي زاده،محمدرضا فروزان

مهندسي مواد

ID4569

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Numerical Modeling of Continuous Cooling of Steel to Predict Microstructure and Mechanical Properties Mohsen Eshraghi Kakhki eshraghi@ma iut ac ir April 2009 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Dr A Kermanpur ahmad k@cc iut ac ir and Dr M A Golozar golozar@cc iut ac ir Abstract In this work a numerical model was developed to simulate the continuous cooling of steel The model was employed for simulation of the cooling process of the plain carbon steel AISI 1045 and the low alloy steel AISI 4140 In the case of AISI 1045 modeling was performed on the cylinders with diameters of 25 50 and 75mm and gears In addition the cooling process of Jominy bars as well as steel gears of AISI 4140 was simulated Still water and still oil were considered as quenching mediums A cylindrical probe of AISI 304 stainless steel was used to evaluate the quench severity of the mediums and various methods were employed to calculate the convective heat transfer coefficients during quenching process Furthermore the effects of latent heat releases during phase transformations temperature and phase fractions on the variation of thermo physical properties were considered In order to simulate the kinetics of diffusional phase transformations JMA equation and additivity rule were employed and a novel approach was applied for computing the actual phase fractions in the off eutectoid steel In the case of martensitic transformation the model of Koinstinen and Marburger was used for AISI 1045 plain carbon steel while a new model was applied for AISI 4140 low alloy steel Moreover the empirical model of Maynier et al was used for hardness predictions The present model was validated against cooling curve measurements metallographic analysis and hardness tests and good agreement was found between the experimental and simulation results This model is able to simulate the continuous cooling and kinetics of phase transformation and to predict the final distribution of microstructures and mechanical properties in steels Key Words Steel Phase transformation Continuous cooling Quenching Numerical simulation pdfMachine is a pdf writer that produces quality PDF files with ease Get yours now Thank you very much I can use Acrobat Distiller or the Acrobat PDFWriter but I consider your product a lot easier to use and much preferable to Adobe s A Sarras USA

احمد كرمانپور، محمد علي گلعذار

فخرالدين اشرفي زاده،محمدرضا فروزان