Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Effect of laser scannings speed on microstructure, tribological and corrosion behavior of Ti-23Nb alloys produced by laser metal deposition
AU - Ren, Y.
AU - Wu, H.
AU - Du, J.
AU - Liu, B.
AU - Wang, X.
AU - Jiao, Z.
AU - Tian, Y.
AU - Baker, I.
PY - 2023/3/31
Y1 - 2023/3/31
N2 - The effect of different laser scanning speeds on the microstructural evolution and associated tribological and corrosion behavior of Ti-23Nb alloys produced by laser metal deposition (LMD) was systematically investigated. The microstructures of all specimens were composed of equiaxed β grains, acicular α″ phases, and unmelted Nb particles. With the increase of scanning speed, the volume fractions of the α″ phase and unmelted Nb particle increased, while the volume fraction and grain size of the β phase decreased. This results in a high hardness (∼ 304 HV) for the specimen with a high scanning speed (2.6 mm/s). Although the hardness of the specimen produced at 2.0 mm/s is slightly lower (∼ 296 HV), it possesses less unmelted Nb particles (soft phases, low hardness of ∼ 107 HV), resulting in a lower wear rate (∼ 4.9 × 10−4 mm3N−1 m−1). Compared to fully alloyed areas, unmelted Nb particles corrode preferentially. The specimen produced at 2.6 mm/s possesses a lower corrosion potential (Ecorr) value owing to the presence of more α″ phase and unmelted Nb particles. Grain size is a critical factor in determining the corrosion current density (icorr). The high scanning speed specimen (2.6 mm/s) with small grain sizes has high resistance and low icorr.
AB - The effect of different laser scanning speeds on the microstructural evolution and associated tribological and corrosion behavior of Ti-23Nb alloys produced by laser metal deposition (LMD) was systematically investigated. The microstructures of all specimens were composed of equiaxed β grains, acicular α″ phases, and unmelted Nb particles. With the increase of scanning speed, the volume fractions of the α″ phase and unmelted Nb particle increased, while the volume fraction and grain size of the β phase decreased. This results in a high hardness (∼ 304 HV) for the specimen with a high scanning speed (2.6 mm/s). Although the hardness of the specimen produced at 2.0 mm/s is slightly lower (∼ 296 HV), it possesses less unmelted Nb particles (soft phases, low hardness of ∼ 107 HV), resulting in a lower wear rate (∼ 4.9 × 10−4 mm3N−1 m−1). Compared to fully alloyed areas, unmelted Nb particles corrode preferentially. The specimen produced at 2.6 mm/s possesses a lower corrosion potential (Ecorr) value owing to the presence of more α″ phase and unmelted Nb particles. Grain size is a critical factor in determining the corrosion current density (icorr). The high scanning speed specimen (2.6 mm/s) with small grain sizes has high resistance and low icorr.
KW - Corrosion behavior
KW - Laser metal deposition
KW - Ti-Nb alloy
KW - Tribological behavior
KW - β and α″ phases
KW - Corrosive effects
KW - Deposition
KW - Grain size and shape
KW - Hardness
KW - Laser applications
KW - Niobium alloys
KW - Surface analysis
KW - Textures
KW - Titanium alloys
KW - Tribology
KW - Volume fraction
KW - Corrosion behaviour
KW - Fraction size
KW - Grainsize
KW - High hardness
KW - Laser scanning speed
KW - Scanning speed
KW - Soft phasis
KW - Tribological behaviour
KW - Β and α″ phase
KW - Binary alloys
U2 - 10.1016/j.matchar.2023.112647
DO - 10.1016/j.matchar.2023.112647
M3 - Journal article
VL - 197
JO - Materials Characterization
JF - Materials Characterization
SN - 1044-5803
M1 - 112647
ER -