Effects of defects on tensile and fatigue behaviors of selective laser melted titanium alloy in very high cycle regime
Effects of defects on tensile and fatigue behaviors of selective laser melted titanium alloy in very high cycle regime
复制标题
缺陷对选区激光熔化钛合金在极高循环状态下拉伸和疲劳行为的影响
DOI：
10.1016/j.ijfatigue.2020.105795
复制
发表时间：
2020-11-01
影响因子：
6
通讯作者：
Liu, Yongjie
中科院分区：
文献类型：
--
作者：
Liu, Fulin;He, Chao;Liu, Yongjie
研究了选区激光熔凝钛合金的拉伸和疲劳行为。该合金具有高缺陷密度，其拉伸性能与锻造合金相当，但疲劳强度明显降低。FGA塑性区与马氏体板条宽度相似。通过K-T图分析了疲劳失效的临界尺寸。基于缺陷特征获得新的值。利用概率统计方法，计算了考虑形状影响的缺陷最大有效尺寸，并通过体密度分析了缺陷之间的竞争关系。
Tensile and fatigue behaviors of selective laser melted titanium alloy were investigated in the as-built condition. The alloy has a high defect density, and its tensile properties are comparable to those of wrought alloys, but the fatigue strength is significantly reduced. The FGA plastic zone is similar to the martensite laths width. The critical size of fatigue failure is analyzed by the K-T diagram. A new value is obtained based on the defect characteristics. Using the probability statistical, the maximum effective size of the defect considering the shape was calculated, and the competitive relationship of the defects was analyzed by volume density.