پديد آورنده :
اخباري زاده، امين
عنوان :
تاثير عمليات سرد كردن زير صفر بر خواص و مكانيزم سايشي فولاد 2436/1
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي و انتخاب مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
هشت، 107،[II] ص: مصور، جدول، نمودار
يادداشت :
ص.ع. به: فارسي و انگليسي
استاد راهنما :
محمد علي گلعذار، علي شفيعي
توصيفگر ها :
كرايو , فولاد مارايجينگ , SEM
تاريخ نمايه سازي :
22/03/87
استاد داور :
مهدي احمديان، فرزاد محبوبي
چكيده فارسي :
به فارسي و انگليسي: قابل رؤيت درنسخه ديجيتال
چكيده انگليسي :
AbstractIn this study effects of cryogenic treatment on wear hardness and mechanical properties of 1 2436tool steel were studied For this purpose two temperatures were used 63 C as shallow cryogenictemperature and 185 C as deep cryogenic temperature In this study effect of cryogenictemperature shallow and deep cryogenic time holding at cryogenic temperature for 20 and 40hours stabilization holding at room temperature for 1 week and effect of austenizing temperature grain size on wear behavior hardness and mechanical properties of 1 2436 was studied Wear testwas performed using pin on disk method In this respect 2 different loads 120 and 180 N and 3different velocities 0 05 0 1 and 0 2 m s were examined It was shown that cryogenic treatmentdecreases retained austenite and hence improves wear resistance and hardness This improvementin deep cryogenic treatment is more compare with shallow cryogenic treatment This could be dueelimination of retained austenite as well as better carbide distribution In longer holding times atcryogenic temperatures more retained austenite was transformed to martensite and hence betterwear behavior and more hardness was seen By stabilizing at room temperatures more retainedaustenite was transform to martensite and better wear behavior and more hardness was reached Insamples which were austenized in different times an optimum austenizing time 20 minaustenizing is observed in which below that 10 min austenizing austenite structure is nothomogenized and beyond that 50 min austenizing grains are so big that wear resistance decreases Cryogenic treatment increases strength and decreases elongation in this steel on the other hand cryogenic treatment decreased toughness In longer holding time at cryogenic temperatures toughness decreases as a result of retained austenite decrease Stabilization time at roomtemperatures decrease toughness as a result of retained austenite decrease
استاد راهنما :
محمد علي گلعذار، علي شفيعي
استاد داور :
مهدي احمديان، فرزاد محبوبي
