Impact of Hot Isostatic Pressing Temperature on Tensile Properties of TA15 Titanium Alloy Produced via Laser Powder Bed Fusion

TA15 titanium alloy holds great significance as a crucial material in the aerospace industry. In order to gain deeper insights into the influence of hot isostatic pressing (HIP) temperature on the tensile characteristics of materials formed through laser powder bed fusion (L-PBF), a comparative heat treatment experiment was crafted, aligning with the HIP treatment temperature settings. Specifically, the temperatures selected for this investigation were 900 degrees C, 940 degrees C, 980 degrees C, and 1020 degrees C, while the duration of the holding time was set at 2 h. Notably, the microstructure within the beta phase region demonstrated distinct disparities between the HIP-treated specimens and those subjected to heat treatment. The heat-treated specimens exhibited the formation of Widmanstatten structure at 980 degrees C, while the metallographic structure of the HIP-treated specimens consisted of the lath alpha phase. In heat-treated specimens, an upward trend in temperature from 900 degrees C to 1020 degrees C led to a gradual decrease in UTS (995 MPa, 947 MPa, 886 MPa, and 892 MPa), YS (921 MPa, 865 MPa, 799 MPa, and 784 MPa). The elongation (15.7%,14.6%, and 13.3%) diminished as the temperature increased from 900 degrees C to 980 degrees C. At 1020 degrees C, the elongation slightly increased to 13.9%. The HIP-treated specimens showcased a declining trend in UTS (1008.5 MPa, 947 MPa, 886 MPa, and 892 MPa) and YS (939 MPa, 897.5 MPa, 839.5 MPa, and 844.5 MPa) with an increase in HIP treatment temperature from 900 degrees C to 980 degrees C, after which they experienced a slight increment upon further elevation to 1020 degrees C. The elongation (16%,18.3%, and 20.5%) demonstrated a remarkable improvement from 900 degrees C to 980 degrees C. At 1020 degrees C, the elongation decreased to 17.5%.

Automated summary

This study investigates the influence of hot isostatic pressing (HIP) temperature on the tensile characteristics of TA15 titanium alloy. The results show that heat treatment and HIP treatment result in differences in microstructure and metallographic structure, as well as affecting the tensile strength, yield strength, and elongation of the material.