발간논문

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Vol.40, No.4, 426 ~ 432, 2002
Title
Research Papers / Mechanical Behaviors : The Effect of Compressive Hold Time on High - Temperature Low Cycle Fatigue Fracture Behavior in Lamellar TiAl Alloy
양성진Seung Jin Yang,박영우Young Woo Park,황선근Sun Keun Hwang,박영삼Young Sam Park,남수우Soo Woo Nam,김낙준Nack Joon Kim
Abstract
Total strain range controlled low cycle fatigue tests have been conducted in lamellar Ti-46.6Al;-1.4Mn-2Mo (at.%) alloy at 800℃ in order to investigate the effect of compressive hold time on high-temperature low cycle fatigue fracture behavior. It is observed that fatigue life decreases with imposing compressive hold time. The experimental results clearly indicate that the imposed compressive hold time accelerates α_2→γ phase transformation at the grain boundary to induce the formation of grain boundary γ phase. Because grain boundary γ phase is proved to be the region where plastic deformation is easily concentrated, it is confirmed that imposed compressive hold time decreases low cycle fatigue life by inducing grain boundary weakness and intergranular cracking.
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