پديد آورنده :
عباسپور، سعيده
عنوان :
توليد و ارزيابي خواص مكانيكي فولاد Bake Hardening جهت استفاده در بدنه خودرو
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
استخراج فلزات
محل تحصيل :
اصفهان : دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
نه، 78، [II] ص. : مصور، جدول، نمودار
يادداشت :
ص. ع. به : فارسي و انگليسي
استاد راهنما :
حسين ادريس
استاد مشاور :
محمد حسين فتحي
توصيفگر ها :
فرآيندBH , نقطه تسليم , اتمسفر كاترل , اسيد شويي
تاريخ نمايه سازي :
22/7/1387
استاد داور :
رضا مظفري نيا، محمد رضا طوقي نژاد
چكيده فارسي :
به فارسي و انگليسي : قابل رويت در نسخه ديجيتال
چكيده انگليسي :
AbstractIn order to reduce weight and energy an extensive amount of bake hardening steels arebeing used in automotive industry These steels offer good formability during pressstamping operations and also provide high final yield strength during paint bakingtreatments for good dent resistance The baking operation is usually simulated by a heattreatment at 170 180 C for 20 30 minutes In this research work the bake hardenability of a low carbon steel contains 0 12 carbonhas been investigated The steel making process was done in an induction furnace Thecast ingots were hot forged and hot rolled in order to reduce thickness The hot rolledsheets were pickled and given 70 75 cold reduction Tensile specimens were preparedfrom the sheets Box annealing was performed at 650 and 700 C for 60 and 120 minutes To examine the effect of cooling conditions water ice quenching and air cooling wereapplied Tensile specimens were prestrained to 4 12 along rolling direction aged at175 C for 30 minutes in a silicon oil bath then air cooled and tensile tested at roomtemperature The effect of prestrain grain size annealing temperature and cooling rate on BH valueswere investigated The results indicate that the BH values increased with the prestrain untilit reaches a maximum at 10 When the prestrain is further increased the bake hardeningdecreased It was found that increase in annealing temperature led to increase in grain sizeas in the amount of solute carbon content The BH values decrease with increasing in grainsize The amount of annealing temperature effect on BH depends on its influence on solutecarbon content Results also indicate that an increase of the cooling rate led to higher BHvalues for the specimens annealed at 700 C but had no significant effect for those annealedat 650 C
استاد راهنما :
حسين ادريس
استاد مشاور :
محمد حسين فتحي
استاد داور :
رضا مظفري نيا، محمد رضا طوقي نژاد
