8500

7881

كارشناسي ارشد

شناسايي و انتخاب مواد فلزي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1392

پانزده،75ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

فخرالدين اشرفي زاده

محمود منير واقفي

14/11/92

علي شفيعي، حميدرضا سليمي

مهندسي مواد

ID7881

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Evaluation of the Effect of TiAlN Coatings on the Performance of Hot Work Steel and the Role of Heat Treatment Behnaz Abdali Date of Submission july 28 2013 Department of Materials Engineering Isfahan University of Technology 8415683111 Iran Degree M Sc Language Farsi Supervisor Fakhreddin Ashrafizadeh Professor ashrafif@cc iut ac ir Abstract TiAlN coatings on cutting tools have good wear and oxidation behavior especially at high speed machining and in this field many papers have been published but there is little research about behavior of these coatings on dies at high temperature conditions In this research frictional behavior of Ti1 XAlX N coatings deposited on H13 hot work steel were evaluated at hot working temperatures and influence of annealing process on tribological properties were studied The coatings were characterized using x ray diffraction optical and scanning electron microscopy energy dispersive spectroscopy and microhardness indentation Tribological behavior of coatings was investigated using the pin on disc tester under the condition of 3 N load linear velocity of 0 1 m s and temperatures of 25 and 600 continuously monitored in oxidation furnace until 700 The results indicated that hardness increased and surface roughness and friction coefficient decreased as the aluminum concentration was increased The results of oxidation tests indicated that TiN under thermal cycle had weight gain while TiAlN coatings showed no weight change up to 700 2 O3 layer on TiAlN coating was found the reason for this Among the coatings studied in this research TiAlN coating produced with 70 Al 30 Ti target composition had the best behavior at room temperature because of high microhardness low friction coefficient and low wear at room temperature Based on the experimental results TiAlN produced with 40 Al 60 Ti target composition was the best coating for dies because of low roughness low friction coefficient and low wear at 600 process was studied on a number of the coated samples heat treated under vacuum at 1000 ygen diffusion in TiAlN coatings and formation of TiAlON solid solution this phase act as a solid lubricant and decreased the friction coefficient of TiAlN coatings at room temperature to values about 0 14 It was concluded that annealing cycle is a useful process to reduce improve frictional behavior of TiAlN coatings at room temperature Key Words Hot Work Steel TiAlN coatings Friction coefficient Oxidation resistance Annealing PDF created with pdfFactory trial version www pdffactory com

فخرالدين اشرفي زاده

محمود منير واقفي

علي شفيعي، حميدرضا سليمي