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2026年3期
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Unveiling the dependence of mechanical properties and fracture mechanisms on the microstructure of TC4 titanium alloy parts fabricated by wire arc additive manufacturing
Unveiling the dependence of mechanical properties and fracture mechanisms on the microstructure of TC4 titanium alloy parts fabricated by wire arc additive manufacturing
摘要
The morphology of β grains is an important factor determining the mechanical properties of wire arc additive man ufacturing(WAAM)TC4 titanium alloy parts.This study applied interlayer ultrasonic impact treatment at three dif ferent deposition currents to alter the grain morphology of TC4 titanium alloy structures,thereby enhancing their mechanical properties.Furthermore,the effects of different grain morphologies on the fracture mechanism and location were innovatively studied.The results indicate that ultrasonic impact treatment recrystallized the β grains into an equiaxed structure and refined the α phase;at a welding current of 100 A,the alpha phase size decreased by ap proximately 40%.The tensile strength improved significantly in both the horizontal and vertical directions,with in creases of 109 MPa and 71 MPa,respectively,leading to more uniform mechanical properties.The discontinuity of αGB hindered crack propagation along the boundaries,preventing intergranular fracture despite β grain refinement.Additionally,crack initiation tended to occur in the fine α regions,resulting in fracture within the deposited layers.
年，卷(期)：
2026, 35(3)
机标分类号：
V261.93
TP393.03
F271
在线出版日期：
2026年10月13日
