This study examined the effects of ultrasonic shot peening (USSP) and stress relieving treatment at 400 °C (USSP-SR) on low cycle fatigue behaviour of Ti-13Nb-13Zr alloy. The Un-USSP, USSP and USSP-SR samples were characterized for microstructure, surface roughness, hardness and low cycle fatigue. The surface microstructure of the USSP and USSP-SR specimens was refined to ∼ 35 nm. At strain amplitudes of 0.55 to 0.90 %, USSP nearly tripled fatigue life; however, the enhancement was lower in the stress relieved condition but still higher than Un-USSP, except at the highest strain amplitude of 0.90 %, where it was 20 % less than Un-USSP.

本研究考察了超声喷丸 (USSP) 和 400 °C 应力消除处理 (USSP-SR) 对 Ti-13Nb-13Zr 合金低周疲劳行为的影响。对 Un-USSP、USSP 和 USSP-SR 样品的微观结构、表面粗糙度、硬度和低周疲劳进行了表征。USSP 和 USSP-SR 样品的表面微观结构被细化到 35 nm。在 0.55 至 0.90 % 的应变幅值下，USSP 的疲劳寿命几乎增加了两倍；然而，应力消除条件下的增强程度较低，但仍高于 Un-USSP，除了最高应变幅为 0.90 %，比 Un-USSP 小 20 %。