발간논문

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Vol.32, No.4, 397 ~ 403, 1994
Title
Effect of Nb Content on the Precipitation Hardening Behavior of Alloy 718
최병학Byung Hak Choe, 안형준Hyung Joon Ahn, 신평우Pyung Woo Shin, 박노광Nho Kwang Park
Abstract
Homogenization treatments were performed at 1200℃ on cast Alloy 718 and its Nb modified version in order to investigate the effects of alloy chemistry and homogenization treatment on age-hardening behavior. Regardless of alloy chemistry, age hardening occurs faster at 1200℃/1hr than at 1200℃/10hrs condition. The remaining Laves phase affects the age-hardening behavior through the control of γ˝ precipitation. The larger volume fraction and even distribution of Laves phases, containing high Nb content, enhance the formation of γ˝ near the Laves phases. A peak hardness was accordingly obtained only after 8hrs of aging at 720℃ in the sample homogenized at 1200℃/1hr. This peak time is in contrast to 28hrs of aging in the sample homogenized ac 1200℃/10hrs. The Laves phase and γ˝ precipitates in the aged alloys were identified with electron microscopy.
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