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投稿时间：2023-12-15 修订日期：2024-01-09
投稿时间：2023-12-15 修订日期：2024-01-09
中文摘要: 对激光沉积制造的Ti65钛合金进行室温低周疲劳实验，对比研究了高、低功率试样的低周疲劳性能。结果表明，高、低功率试样均表现出循环软化的特征，随着应变幅的增加，试样的软化率在不断提高；相同应变幅下，高功率试样的软化率和疲劳寿命高于低功率试样。通过损伤演化模型对疲劳寿命进行预测，预测结果较为准确，均处于1.5倍分散带以内。低应变幅下，低功率试样疲劳源萌生于气孔缺陷，高功率试样疲劳源萌生于表面裂纹，低功率试样裂纹萌生速度明显快于高功率试样，疲劳寿命更低；高应变幅下，试样具有多疲劳源，疲劳寿命明显下降。不同功率试样的裂纹均以穿晶断裂的形式进行扩展。
Abstract:The low-cycle fatigue experiment of Ti65 titanium alloy manufactured by laser deposition was carried out at room temperature, and the low-cycle fatigue performance of high and low power samples was compared. The results show that both high and low power samples show the characteristics of cycle softening, and the softening rate of the sample is constantly increasing with the increase of strain amplitude. High power specimens have higher softening rates and fatigue life than low power specimens at the same strain amplitude. The fatigue life was predicted by the damage evolution model, and the prediction results were more accurate, all within the 1.5-fold dispersion band. Under low strain amplitude, the fatigue source of low-power specimen germinates from stomatal defects, the fatigue source of high-power specimen germinates from surface cracks, and the crack initiation speed of low-power specimens is significantly faster than that of high-power specimens, and the fatigue life is lower. Under high strain amplitude, the specimen has multiple fatigue sources, and the fatigue life is significantly reduced. The cracks of different power specimens are propagated in the form of through-crystal fractures
文章编号：YSJSGC20230717 中图分类号：TG115.5 文献标志码：
基金项目:国家自然科学基金(52105157)；中国博士后科学基金(2023MD734242)；辽宁省教育厅2021年度科学研究经费项目(面上项目)(LJKZ0194)
引用文本：
李晓丹,孙浩军,殷俊,刘艳梅,倪家强,周松,安金岚,回丽.激光沉积Ti65钛合金低周疲劳性能[J].有色金属工程,2024,(5):.
李晓丹,孙浩军,殷俊,刘艳梅,倪家强,周松,安金岚,回丽.激光沉积Ti65钛合金低周疲劳性能[J].有色金属工程,2024,(5):.
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