Study on Defects Formation Mechanism of Large Section TC4 Titanium Forging
During ultrasonic testing of a large section TC4 titanium alloy forging,irregular hole and black spots were found.In order to find the causes of these defects,elemental analysis,microstructure observation,texture testing,micro area composition analysis,and hardness testing were carried out.The results show that there are regular fluctuations in Al,V,and Fe elements near the hole defect,which is caused by the residual riser of the ingot.The black spot area has coarse grains,concentrated internal stress,high dislocation density,and high hardness,which is a significant metallurgical defect caused by uneven chemical composition in the micro area,resulting in segregation of rich alpha phase element(Al).
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