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14 激光扫描方向、熔池内凝固界面移动方向和晶体择优生长方向关系示意图

Fig.14 Schematics of the relations between the laser scanning direction ( $V$ ), the solidification interface front direction ( $V_{S - L}$ ) (a), and the grain preferred growth direction ( $V_{u v w}$ ) (b) (θ $_{S - L}$ —the angle between $V_{S - L}$ and $V$ , ψ—the angle between $V_{u v w}$ and $V_{S - L}$ )