TY - JOUR
T1 - Enhancing the tensile properties of laser repairing Ti-6Al-4V alloys
T2 - Optimization of strain distribution based on composition fine-turning
AU - Zhang, Hengxin
AU - Wang, Geng
AU - Yang, Sen
AU - Wang, Nan
AU - Prashanth, Konda Gokuldoss
AU - Ye, Zimeng
AU - Zhao, Kexin
AU - Zhang, Fengying
AU - Tan, Hua
N1 - Publisher Copyright:
© 2024
PY - 2024/12
Y1 - 2024/12
N2 - In the context of laser repairing damaged forging titanium (Ti) alloys, a common challenge is the significant reduction in elongation of the repaired samples compared to that of the substrate. In this work, directed energy deposition (DED) technology was employed to repair the TC4 (Ti-6Al-4V) forgings by manipulating the Al and V contents of the repaired zone (RZ). Subsequent evaluation encompassed the microstructure, microhardness, and tensile properties across the laser repair deposition samples (LRDs). The results revealed that despite the LRD TC4–0Ti's strength reaching 97.80% of the substrate, its elongation is only 43.93% of the substrate. Upon appropriately reducing the Al and V contents of RZ, the LRD TC4–5Ti demonstrates a strength of 935.04 MPa and an elongation of 14.59%, achieving 98.70% and 82.38% of the substrate, respectively. As the Al and V contents of RZ are further decreased, the strength of the LRDs gradually diminishes, falling below the forging standards. Utilizing digital image correlation (DIC) technology, the deformation behavior of different zones during the tensile process of these LDRs was investigated. The results indicated a concentration of strain distribution within either RZ or the substrate zone (SZ) of the LRDs during the tensile process, which signifies the mismatch of deformation capacity between these two zones. Consequently, the tensile properties of the LRDs were adversely affected. By judiciously adjusting the Al and V contents of RZ, the abovementioned mismatch phenomenon can be ameliorated, which facilitates a synergistic strain behavior between SZ and RZ during the tensile process, aiding in the homogenization of strain distribution and consequently enhancing the tensile properties of the LRDs.
AB - In the context of laser repairing damaged forging titanium (Ti) alloys, a common challenge is the significant reduction in elongation of the repaired samples compared to that of the substrate. In this work, directed energy deposition (DED) technology was employed to repair the TC4 (Ti-6Al-4V) forgings by manipulating the Al and V contents of the repaired zone (RZ). Subsequent evaluation encompassed the microstructure, microhardness, and tensile properties across the laser repair deposition samples (LRDs). The results revealed that despite the LRD TC4–0Ti's strength reaching 97.80% of the substrate, its elongation is only 43.93% of the substrate. Upon appropriately reducing the Al and V contents of RZ, the LRD TC4–5Ti demonstrates a strength of 935.04 MPa and an elongation of 14.59%, achieving 98.70% and 82.38% of the substrate, respectively. As the Al and V contents of RZ are further decreased, the strength of the LRDs gradually diminishes, falling below the forging standards. Utilizing digital image correlation (DIC) technology, the deformation behavior of different zones during the tensile process of these LDRs was investigated. The results indicated a concentration of strain distribution within either RZ or the substrate zone (SZ) of the LRDs during the tensile process, which signifies the mismatch of deformation capacity between these two zones. Consequently, the tensile properties of the LRDs were adversely affected. By judiciously adjusting the Al and V contents of RZ, the abovementioned mismatch phenomenon can be ameliorated, which facilitates a synergistic strain behavior between SZ and RZ during the tensile process, aiding in the homogenization of strain distribution and consequently enhancing the tensile properties of the LRDs.
KW - Digital image correlation
KW - Laser repair deposition
KW - Strain behavior
KW - Tensile properties
KW - Titanium alloy
UR - http://www.scopus.com/inward/record.url?scp=85191901799&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2024.02.065
DO - 10.1016/j.jmst.2024.02.065
M3 - 文章
AN - SCOPUS:85191901799
SN - 1005-0302
VL - 201
SP - 1
EP - 11
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -