选区激光熔化镍基单晶高温合金的熔池显微组织

发布时间：2018-04-18 19:32

  本文选题：激光技术 + 选区激光熔化　； 参考：《激光与光电子学进展》2017年07期

【摘要】：根据柱状晶向等轴晶转变(CET)图,建立了激光熔池横截面的几何关系,得出了选区激光熔化(SLM)镍基单晶高温合金的凝固条件与显微组织的关系,并在SRR99单晶基板的(100)晶面上沿[001]方向进行了SLM实验。结果表明,当激光功率为160 W、铺粉层厚为20μm、扫描速率V_b≤30m·min~(-1)时,凝固速度与激光扫描速度的夹角最小值为46.4°(大于45°)。可以预测激光熔池组织仅由熔池底部向顶部生长的[001]枝晶和熔池两侧的[010]枝晶组成,实验结果与理论分析结果相吻合,且层间形成了良好的冶金结合,基层的结晶取向得到延续。
[Abstract]:Based on the CET diagram of columnar crystal to equiaxed crystal, the geometrical relationship of cross section of laser melting pool is established, and the relationship between solidification conditions and microstructure of selective laser melting nickel base single crystal superalloy is obtained.SLM experiments were carried out on the crystal plane of SRR99 single crystal substrate in the direction of [001].The results show that the minimum angle between solidification velocity and laser scanning velocity is 46.4 掳(> 45 掳) when the laser power is 160 W, the coating thickness is 20 渭 m and the scanning rate is V _ (B) 鈮，

本文编号：1769756