基于激光选区熔化工艺制备的TC4制件应用研究

Application Performance Research of TC4 by Selective Laser Melting

本文使用激光选区熔化(SLM)工艺制备TC4钛合金标准试样以及典型零件。通过进行不同热处理工艺实验,研究了材料金相组织及常规力学性能,并获得最优热处理工艺。确定了800℃为最优退火温度,兼顾材料组织均匀性与力学性能,并通过测试高周疲劳S-N曲线,对制件进行力学性能的全面评价。TC4在107次高周疲劳循环应力的环境中疲劳极限σR为350 MPa,表现出稳定的疲劳强度。最终通过典型零件地面功能试验考核,获得SLM成形TC4零件关键应用性能参数,为TC4金属3D打印零件的应用提供依据。

In this paper, a selected laser melting(SLM) process was used to prepare TC4 titanium alloy standard samples and typical parts. Through different heat treatment process tests, the metallographic structure and conventional mechanical properties of the material were analyzed, and the optimal heat treatment process was finally obtained. 800 ℃ is determined to be the optimal annealing temperature, taking into account the microstructure uniformity of the material and the mechanical properties. In addition, the high-cycle fatigue S-N curve was tested to conduct a comprehensive performance evaluation of the mechanical properties of the parts. The fatigue limit σRof TC4 in the environment of 107high-cycle fatigue cycles is 350 MPa, showing stable fatigue strength. Finally, through the ground function test assessment of typical parts, the key application performance parameters of SLM-formed TC4 parts are obtained, which provides a basis for the application of TC4 metal 3D printed parts.