TC4激光选区熔化/同轴送粉成形连接的力学性能研究

Research on Mechanical Properties of Selective Laser Melting/Coaxial Powder Feeding Forming Connection

对TC4选区熔化/同轴送粉成形连接件的拉伸性能和疲劳性能进行研究。通过对比不同线能量密度参数下拉伸试验数据,得到线能量密度对TC4成形连接件拉伸性能的影响规律。通过对比相同应力水平下成形连接件与母材的中值疲劳寿命和疲劳极限,获得成形连接件相对母材疲劳特性的衰减程度。采用当量Kt法对成形连接件的疲劳性能进行表征,得到成形连接件的当量应力集中系数Kte。通过对比TC4成形连接件与TA154种焊接工艺的(Kte)50,发现较焊接工艺成形连接工艺,具有更优的疲劳特性。

The tensile and fatigue properties of TC4 selective laser melting/coaxial powder feeding forming joints were studied.By comparing the tensile test data under different linear energy density parameters,the influence of linear energy density on the tensile properties of TC4 formed joints was obtained.By comparing the median fatigue life and fatigue limit of the formed joints and the base metal at the same stress level,the attenuation degree of the fatigue characteristics of the formed joints relative to the base metal is obtained.Equivalent Kt was used to characterize the fatigue properties of formed joints,and the equivalent stress concentration factor Kte of formed joints was obtained.Compared with the welding process,the forming connection process has better fatigue characteristics.