Studies on Microstructure and Properties by Mass Smelting for Directionally Solidified Superalloy

Abstract:

Large quantities of VIDP400 vacuum furnace smelting DZ417G oriented superalloys smelting process has been researched, analysis of the main factors affecting the organizational uniformity and stability, as well as the impact of high temperature tensile and lasting properties has been studied. The results showed that: At pulling rate of 4.5~8.5mm•min^-1, after 1220°C solid solution treatment and 980°C aging system, the DZ417G superalloy had uniform chemical constitution with oxygen and nitrogen content of the alloy in sharply reduced to 13ppm. It can be got available treatment uniform structure with proper γ'phase size, with high-temperature tensile strength up to 750MPa, elongation of 17% reduction of area 22%. The lasting high temperature performance can reach to more than 100 hours.

• Periodical: Materials Science Forum (Volume 849)
• Pages: 508-512
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.849.508
• Online since: March 2016
• Authors: Yang Gao, Yong Ji Niu, Shi Feng Shi, Jian Jun Tian, Chao Wang, Zhi Wei Zhang, Ning An
• Keywords: DZ417G Directional Superalloy, Large Quantities of Smelting, Organizational Stability, Organizational Uniformity

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