Thermal Deformation Behavior of TC4ELI-TC21 Gradient Titanium Alloy Fabricated by Laser Deposition Manufacturing AITranslate

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Chinese Library Classification Number:TG146.23[一般工业技术—材料科学与工程];TG665[金属学及工艺—金属材料]

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TC4ELI-TC21 gradient titanium alloy material was fabricated via laser deposition manufacturing(LDM).To investigate the feasibility of simultaneously applying micro-casting and forging during the addi-tive manufacturing process of this gradient material,thermal compression tests were conducted at tempera-tures of 850℃,900℃,950℃and 1000℃and strain rates of 0.01 s^-1,0.1 s^-1,1 s^-1 and 10 s^-1.The in-fluence of deformation temperature and strain rate on the peak stress and microstructural evolution beha-vior was analyzed.The results indicate that the TC4ELI-TC21 gradient titanium alloy fabricated by LDM exhibit highly consistent microstructural evolution and integrated mechanical behavior during thermal de-formation.The alloy demonstrates pronounced dynamic softening at elevated temperatures,with peak stress decreasing with increasing temperature and increasing with increasing strain rate.As the deformation temperature increases,the lamellarαphase undergoes dynamic recrystallization,transforming into equiaxedαphase.Furthermore,the volume fraction of equiaxedαphase gradually decreases with increasing strain rate.When the deformation temperature reaches 1000℃,a martensitic transformation occurs within the material,resulting in a microstructure dominated by martensite.Based on the hyperbolic sine-modified Ar-rhenius model,the constitutive equation and thermal processing map were established for the thermal de-formation of LDM-fabricated TC4ELI-TC21 gradient titanium alloy.Based on the instability regions and power dissipation characteristics revealed by the thermal processing map,the optimal thermal deformation process window for this alloy is determined to be a deformation temperature of 900~950℃and a strain rate of 0.01~0.1 s^-1.