《Table 2.O and S contents in alloys added with different amounts of Y at different superheating temp

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《Mechanisms of reactive element Y on the purification of K4169 superalloy during vacuum induction melting》

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ppm

The nominal composition of K4169 superalloy is shown in Table 1.Different contents of rare earth element Y（0，0.005wt%，and 0.1wt%）were added to the alloy.The alloy ingots were obtained by VIM in a 100-k W ZG125C VIM furnace.Before melting，the chamber was evacuated to the vacuum pressure of 3.5×10-3 Pa and backfilled with pure argon（O2<10 ppm；N2<50 ppm；H2<5 ppm；and CH4<4 ppm）up to 0.05 MPa for three times to reduce the O content to a minimum level and avoid the evaporation of alloy components.The superheating temperatures used were 1550，1600，and 1700°C.The refining time was set as 10 min，and the pouring temperature was 1480°C（measured and controlled by an IR thermometer）.The Y2O3 ceramic crucibles with a purity of 99%were prepared by cold isostatic pressing at 180 MPa and sintered in a vacuum resistance furnace at 2000°C.