| Title |
Research Papers / Mechanical Behaviors : The Effect of Compressive Hold Time on High - Temperature Low Cycle Fatigue Fracture Behavior in Lamellar TiAl Alloy |
| Authors |
양성진(Seung Jin Yang),박영우(Young Woo Park),황선근(Sun Keun Hwang),박영삼(Young Sam Park),남수우(Soo Woo Nam),김낙준(Nack Joon Kim) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| 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. |