摘要
以高强度铝合金粉末为原材料,通过选区激光熔融打印并确定其工艺和后处理参数,对横向和纵向两个方向打印的试验件进行静力和疲劳性能研究。结果表明:两个方向上的拉伸屈服强度和抗拉强度都高于500 MPa,断裂为韧性断裂模式,打印件内部氧化物夹杂和未融合均会引起强度和塑性下降。断裂韧性分析表明两个方向上的KIC均值接近且分散性较小。裂纹扩展速率试验中能明显辨别出稳定扩展区,并用Paris模型对结果进行拟合,进一步通过室温高周疲劳试验测定了不同条件下的疲劳极限。对增材制造高强铝合金原材料、打印工艺以及工程性能进行了较全面的研究。
Taking high-strength aluminum alloy powder as raw material, the static and fatigue properties of transverse and longitudinal printed samples were studied which produced by selecting laser melting printing with determining the process and post-processing parameters. The results show that the tensile yield strength and ultimate strength in both directions are higher than 500 MPa, and the fracture mode is ductile way according to the cross section analysis after stretching. The strength and plasticity of the printed parts decrease due to oxide inclusion and non-fusion. The mean value of KICin both directions is close and the dispersion of all data is small. In the crack growth rate test, the stable growth zone can be clearly identified, and the Paris model is used to fit the results. Furthermore, the fatigue limit under different conditions is determined by high cycle fatigue test at room temperature. The raw materials, additive manufacturing process and engineering performance of high strength aluminum alloy were studied comprehensively.
作者
徐亚芳
杨钒
黄洁
陈挺
XU Yafang;YANG Fan;HUANG Jie;CHEN Ting(Shanghai Aircraft Design and Research Institute,Shanghai 201210,China;Shanghai Aircraft Airworthiness Certification Center of CAAC,Shanghai 200335,China;Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324,China)
出处
《热加工工艺》
北大核心
2022年第12期50-55,共6页
Hot Working Technology
