选区激光熔化René 88DT高温合金的晶粒组织及冶金缺陷调控

刘健, 彭钦, 谢建新

Grain Structure and Metallurgical Defects Regulation of Selective Laser Melted René 88DT Superalloy

LIU Jian, PENG Qin, XIE Jianxin

表1 选区激光熔化成形实验参数、形成的缺陷类型及缺陷密度

Table 1 Experimental parameters, defect types and defect densities of selective laser melted specimens

Specimen No. P V A Defect density / % W mm·s-1 (°) Incomplete fusion Pore Crack 1 200 960 90 0.513 0.025 0.054 2 250 960 90 0.018 0.011 0.107 3 300 960 90 0 0.015 0.403 4 350 960 90 0 0.017 0.485 5 400 960 90 0 0.023 0.771 6 300 720 90 0 0.050 0.646 7 300 840 90 0 0.018 0.397 8 300 1080 90 0 0.027 0.187 9 300 1200 90 0 0.012 0.069 10 300 960 0 0 0.030 2.213 11 300 960 67 0 0.012 0.101