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3 4种工艺参数下的单道试样x-y面和y-z面形貌的SEM像

Fig.3 SEM images of single-track samples in the x-y (a-d) and y-z (e-h) planes under S1 (a, e), S2 (b, f), S3 (c, g), and S4 (d, h) processes (White dotted line in Fig.4e indicates boundary of grains in two different orientations, red arrows indicates growth directions)