Effect of Ceramic Shot Peening on Fatigue Properties of TC18 TitaniumAlloy by Laser Additive Manufacturing
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摘要: 对激光增材制造成形TC18钛合金进行陶瓷丸喷丸强化，研究了喷丸强度对其表面形貌、表面粗糙度、表层残余压应力、硬度和疲劳性能的影响。结果表明：随着喷丸强度的提高，合金表面加工痕迹逐渐消失但弹坑变得明显，表面粗糙度和残余压应力均增大；喷丸强化可以提高合金的硬度和弹性模量；随着喷丸强度的提高，合金疲劳寿命先增大后减小，疲劳裂纹源先从表面向材料内部转移，后回到表层；0.20～0.25 mm喷丸强度试样的疲劳寿命最高。Abstract: Ceramic shot peening was performed on TC18 titanium alloy formed by laser additive manufacturing, and effects of shot peening intensity on the surface morphology, surface roughness, surface residual compressive stress, hardness and fatigue properties were studied. The results show that with the increase of shot peening intensity, the alloy surface processing traces gradually disappeared, but the craters became obvious, and the surface roughness and residual compressive stress increased. Shot peening improved the hardness and elastic modulus of the alloy. As the shot peening intensity increased, the fatigue life of the alloy increased first and then decreased, and the fatigue cracks source first transferred to the inside from the surface of the material and then returned to the surface. The fatigue life of the sample with 0.20-0.25 mm shot peening intensity was the highest.
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