Mekanik alaşımlama yöntemi ile Ni esaslı bir süperalaşımın üretimi, mikro yapı-mekanik ve oksitlenme özelliklerinin araştırılması
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Abstract
Bu çal/0mada, nikel esasl/ süperala0/m toz kar/0/m/ (%75 Ni, %20 Cr, %4Al2O3, %0.6 Ti, %0.4 Y2O3) inert gaz ortam/nda, Szegvari tipi atritörde ½-24saat farkl/ sürelerde paslanmaz çelik ve seramik kapta mekanik ala0/mlama(MA) i0lemine tabi tutulmu0tur. Toz analizleri, optimum toz tane boyutu vemikro yap/n/n 8 saat sonunda elde edildiDini göstermi0, bu nedenle bloknumuneler 8 saat mekanik ala0/mlanm/0 tozlardan üretilmi0tir. Bloknumunelerin; sinterleme, s/cak deformasyon ve ikinci yeniden kristalle0me(YK) sonras/ mikro yap/, mekanik ve oksitlenme özellikleri ara0t/r/lm/0t/r.ÖDütülen toz ve üretilen numuneler; toz boyut analizi, mikro sertlik deneyi, /0/kmikroskobu, EDAX, elektron mikroskop (SEM) ve X-RD yöntemleri ileincelenmi0tir. Deneysel sonuçlardan; MA süresine baDl/ olarak toz parçac/kyap/ ve özelliklerinde deDi0me olduDu, YK ile 100 ?m civar/nda taneler eldeedildiDi, mekanik deney sonras/ numunelerde sünek k/r/lma tavr/ ve artanoksitleme süresi ile numune aD/rl/D/nda art/0 olduDu tespit edilmi0tir. In this study a nickel based superalloy powders (75Ni, 20Cr, 4Al 2O3, 0.6Ti, 0.4Y2O3%) were mechanically alloyed (MA) in a Szegvari type attritor under inertgas atmosphere for various durations ( ½ to 24 h) in stainless steel and ceramiccontainers. The powder analysis has revealed that the optimum particle size andthe microstructure were obtained after 8 h mechanical alloying. Thus, blockswere produced from those powders. Microstructure, mechanical properties andoxidation behavior of blocks after sintering, hot deformation and secondaryrecrystallization were investigated. Particle size analysis, micro hardness tests,light microscope and scanning electron microscopes (with EDAX) analysis andX-RD methods were conducted on both mechanically alloyed powders and theproduced blocks. Experimental results showed that; structure and properties ofthe powders changed with MA durations, grains with the mean size of 100 ımwere obtained after secondary recrystallization heat treatment, ductile fracturebehavior was observed after mechanical tests and weight gain was seen withincreasing the oxidation time.
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