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Very-high-cycle fatigue behavior of Ti-6Al-4V manufactured by selective laser melting: Effect of build orientation
International Journal of Fatigue ( IF 6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ijfatigue.2020.105628 Guian Qian , Yanfeng Li , D.S. Paolino , A. Tridello , F. Berto , Youshi Hong
International Journal of Fatigue ( IF 6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.ijfatigue.2020.105628 Guian Qian , Yanfeng Li , D.S. Paolino , A. Tridello , F. Berto , Youshi Hong
Abstract The effect of building orientation on the very-high-cycle fatigue (VHCF) response of Ti-6Al-4V specimens produced through selective laser melting (SLM) process with three different building orientations (0°, 45° and 90°) has been experimentally assessed. The fatigue performance decreases with different building orientations from 0° to 90°. The fatigue crack origin has been found to be always an internal defect both at high-cycle fatigue and VHCF regime independent of building orientations. Size of defects induced fatigue failures and the stress intensity factor range decrease with the number of cycles to failure. By considering the VHCF strength at 109 cycles, the median value decreases from 217 MPa (0°) to 201 MPa (45°) and finally to 155 MPa (90°), with a 40% reduction from 0° to 90°. The building orientation significantly influences both the defect size and the resulting VHCF response.
中文翻译:
选择性激光熔化制造的 Ti-6Al-4V 的超高周疲劳行为:构建方向的影响
摘要 构建方向对通过选择性激光熔化 (SLM) 工艺生产的 Ti-6Al-4V 试样的甚高周疲劳 (VHCF) 响应的影响具有三种不同的构建方向 (0°、45° 和 90°)。被实验评估。疲劳性能随着建筑方向从 0° 到 90° 的不同而降低。已经发现疲劳裂纹起源始终是高周疲劳和 VHCF 状态下的内部缺陷,与建筑方向无关。导致疲劳失效的缺陷尺寸和应力强度因子范围随着失效循环次数的增加而减小。通过考虑 109 次循环时的 VHCF 强度,中值从 217 MPa (0°) 下降到 201 MPa (45°),最终下降到 155 MPa (90°),从 0° 到 90° 下降了 40%。
更新日期:2020-07-01
中文翻译:
选择性激光熔化制造的 Ti-6Al-4V 的超高周疲劳行为:构建方向的影响
摘要 构建方向对通过选择性激光熔化 (SLM) 工艺生产的 Ti-6Al-4V 试样的甚高周疲劳 (VHCF) 响应的影响具有三种不同的构建方向 (0°、45° 和 90°)。被实验评估。疲劳性能随着建筑方向从 0° 到 90° 的不同而降低。已经发现疲劳裂纹起源始终是高周疲劳和 VHCF 状态下的内部缺陷,与建筑方向无关。导致疲劳失效的缺陷尺寸和应力强度因子范围随着失效循环次数的增加而减小。通过考虑 109 次循环时的 VHCF 强度,中值从 217 MPa (0°) 下降到 201 MPa (45°),最终下降到 155 MPa (90°),从 0° 到 90° 下降了 40%。