搭接工艺对选区激光熔化镍基单晶高温合金<strong>DD491</strong>晶体取向与微观组织的影响

搭接工艺对选区激光熔化镍基单晶高温合金DD491晶体取向与微观组织的影响

张振武, 李继康, 许文贺, 沈沐宇, 戚磊一, 郑可盈, 李伟, 魏青松

Effects of Overlapping Process on Grain Orientation and Microstructure of Nickel-Based Single-Crystal Superalloy DD491 Fabricated by Selective Laser Melting

ZHANG Zhenwu, LI Jikang, XU Wenhe, SHEN Muyu, QI Leiyi, ZHENG Keying, LI Wei, WEI Qingsong

图7 多道搭接熔池示意图和熔池几何特征与工艺参数的关系

Fig.7 Schematic of multi-track overlapping melt pool (a); relationships between process parameters and standard deviation (SD) (b), average melt pool depth ( $\bar{D}$ ) (c), average overlapping region depth ( $\bar{d}$ ) (d), and radio of $\bar{d} / \bar{D}$ (e) (D_i —depth of melt pool i, d_j —depth of overlapping region j, l_k —height from the highest point of melt pool/overlapping region k to substrate plane)