Effect of volume fraction of alpha and transformed beta on the high cycle fatigue properties of bimodal Ti6Al4V alloy

7th International Conference on Key Engineering Materials

材料科学;工业技术

Jadhav, Shital^1 ; Powar, Amit^1 ; Patil, Sandip^1 ; Supare, Ashish^1 ; Farane, Bhagwan^1 ; Singh, Rajkumar^1

Kalyani Centre for Technology and Innovation

Bharat Forge Ltd., Pune

411036, India^1

关键词: Alpha phase;    Fatigue strength;    High cycle fatigue;    High cycle fatigue properties;    Rotating bending fatigue;    Rotating bending fatigue tests;    Solutionizing;    Ti-6Al-4V alloy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/201/1/012035/pdf
DOI  :  10.1088/1757-899X/201/1/012035

来源: IOP

【 摘 要 】

The present study was performed to investigate the effect of volume fraction of alpha and transformed beta phase on the high-cycle fatigue (HCF) properties of the bimodal titanium Ti6Al4V alloy. The effect of such morphology on mechanical properties was studied using tensile and rotating bending fatigue test as per ASTM standards. Microstructures and fractography of the specimens were studied using optical and scanning electron microscopy (SEM) respectively.Ti6Al4V alloy samples were heat treated to have three distinctive volume fractions of alpha and transformed beta phase. With an increase in quench delay from 30,50 and 70 sec during quenching after solutionizing temperature of 967°C, the volume fraction of alpha was found to be increased from 20% to 67%. Tests on tensile and rotating bending fatigue showed that the specimen with 20% volume fraction of alpha phase exhibited the highest tensile and fatigue strength, however the properties gets deteriorate with increase in volume fraction of alpha.