中国激光, 2017, 44 (6): 0602009, 网络出版: 2017-06-08   

不同工艺条件对激光熔化多道沉积DD5单晶高温合金杂晶的影响 下载: 535次

Influence of Processing Conditions on Formation of Stray Grains in DD5 Single-Crystal Superalloys by Laser Melting Multi-Traced Deposition
刘小欣 1,2,*程序 1,2王华明 1,2李佳 1,2
作者单位
1 北京航空航天大学大型金属构件增材制造国家工程实验室, 北京 100191
2 北京航空航天大学材料科学与工程学院, 北京 100191
摘要
研究了基材热处理态和激光扫描速率对多道沉积DD5单晶高温合金沉积道内的杂晶(SGs)形核位置及数量的影响, 探讨了不同条件下杂晶的形成机理。结果表明, 当激光扫描速由5 mm/s增大到20 mm/s时, 沉积道顶部的柱状晶-等轴晶转变(CET)导致杂晶数目减少; 采用固溶方式处理基材时, 沉积道底部杂晶的尺寸和数量较铸态基材的明显减小; 沉积道之间的相互搭接不会产生新的杂晶;当采用固溶态基材、激光扫描速率为20 mm/s时, 基本可以得到无杂晶的多沉积道搭接界面。
Abstract
The influences of the substrate as-heat-treated condition and the laser scanning speed on the nucleation position and the number of stray grains (SGs) in multi-traced deposition of DD5 single-crystal superalloys are studied. The formation mechanism of SGs under different conditions is also investigated. The results show that, when the laser scanning speed increases from 5 mm/s to 20 mm/s, the number of SGs decreases as a result of the columnar to equiaxed transition (CET) on the top of deposition traces. As for the solution-treated substrates, the number and the sizes of SGs at the bottom of the deposition traces are obviously smaller than those for the casted substrates. The overlapping among deposition traces does not create new SGs. When the solution-treated substrates are used and the laser scanning speed is 20 mm/s, an overlapping interface without SGs by multi-traced deposition can be achieved.

刘小欣, 程序, 王华明, 李佳. 不同工艺条件对激光熔化多道沉积DD5单晶高温合金杂晶的影响[J]. 中国激光, 2017, 44(6): 0602009. Liu Xiaoxin, Cheng Xu, Wang Huaming, Li Jia. Influence of Processing Conditions on Formation of Stray Grains in DD5 Single-Crystal Superalloys by Laser Melting Multi-Traced Deposition[J]. Chinese Journal of Lasers, 2017, 44(6): 0602009.

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