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An Investigation into the Kinetics of Dynamic Recrystallization of Fe-Ni Alloy
, M.Sc. Thesis Sharif University of Technology ; Karimi Taheri , Ali (Supervisor) ; Abbasi, Mehdi (Supervisor)
Abstract
The A-286 superalloy is an iron-nickel base alloy having properties such as oxidation resistance and high mechanical strength. In addition, good producibility and high workability are the important properties of this alloy. In the present work dynamic restoration mechanism of A-286 supper alloy during thermo-mechanical processing has been studied. The aim is to verify the dominant restoration mechanism in different deformation conditions and also to determine the desire deformation parameters for hot rolling. In this regard, utilizing compression test in the range of 950 to 1100ºC and strain rate of 0.001 to 1 per second, the strain-stress curve for this alloy was obtained. After correction...
Investigation of Effect of Hot rolling Parameters on Mechanical and Physical Properties of a Fe-Ni-Co Alloy
, M.Sc. Thesis Sharif University of Technology ; Karimi Taheri, Ali (Supervisor) ; abbasi, mehdi (Supervisor)
Abstract
Fe-29Ni-17Co alloy with commercial name “Kovar” is an alloy with low expansion coefficient. The main specification of this alloy is to maintain this property at the high temperatures that is used in sealing of glass-metal. Achieving to desirable physical properties associated with suitable mechanical properties is the purpose of related industries. However the effect of cold work and heat treatment was studied on the physical properties of this alloy, there is no report about the effect of the hot work. Thus, in this investigation, the effect of the hot work on the physical and mechanical properties of Kovar was studied. At first, slabs of Kovar alloy were cast and remelted. Then,...
Investigating the Effect of Hot Rolling of Ti-6Al-4V Alloy Containing Titanium Carbonitride Particles and Boron Addition on Microstructure Evolution and Mechanical Properties
, M.Sc. Thesis Sharif University of Technology ; Ziaei Moayyed, Ali Akbar (Supervisor) ; Asgari, Sirus (Supervisor) ; Abbasi, Mehdi (Supervisor)
Abstract
In this thesis, two ingot of Ti-6Al-4V alloy containing titanium carbonitride particle, one with adding boron and the other without boron were fabricated by VIM furnace and using graphite crucible. Boron was added for the purpose of investigating its effect on microstructural evolution and mechanical properties. By Processing Casting ingots under TMP and heat treatment sequences, strips with 3 millimeter thickness were produced. In secondary rolling stage, rolling temperature was considered variable in alpha and alpha + beta phase field and its effect was studied on microstructural characteristics and mechanical properties. In as-rolled condition, it was found that increasing the rolling...