سال انتشار: ۱۳۹۱
محل انتشار: سومین کنفرانس بین المللی عملیات حرارتی مواد
تعداد صفحات: ۸
s Sabooni – PhD student- department of materials engineering, Isfahan university of technology, Isfahan, Iran
r Tahmasebi – MSc- Mining and Metallurgical Engineering Department, Amirkabir University of Technology, Tehran, Iran
Nickel based super alloys form a class of high temperature materials which combine several hardening mechanisms providing excellent mechanical and corrosion resistant properties from room temperature up to elevated temperatures. The properties of a material are determined by its chemical composition and microstructure. In nickel-based super alloys besides the size and distribution of hardening intergranular precipitates, the controlling microstructural features include the size and distribution of grains, the size, morphology, distribution and nature of grain boundary precipitates is very important. In this study, a rolled Ni-Cr-Mo alloy with 0.3mm thickness was used as initial material. The as-received materials were solutionized at a temperature of 1242 0C and aged in different temperatures and times to obtain appropriate mechanical properties. The results showed tensile strength and microhardness of heat treated samples reached to about 1756 Mpa and 585 HV after 15h of aging at 725 0C. Also, the α-Cr precipitates were determined as the main reason for improving mechanical properties.