Research and Analysis on the Phenomenon of Boron Increase in the Melting Process of Casting Superalloy

Author of the article:LU Hongguo 1,2 , MA Zhonggang 2 , LI Huakun 2 , XU Lin 2 , WANG Guanghua 2 , LI Daoqian 2 , YIN Feng

Author's Workplace：1. School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China; 2. Shandong Ruitai New Material Technology Co., Ltd., Zibo 256100, China

Key Words：vacuum melting; increase boron; casting high temperature alloy

Abstract：A 500 kg vacuum induction melting furnace and spectrometer were used to study boron addition in casting
superalloy smelting process, and the causes of boron addition in casting superalloy were analyzed. The results show that C,
Al and Ti will react with B 2 O 3 during the crucible melting of cast superalloy made of rammed magnesium oxide containing
boric acid, resulting in the increase of boron element in the alloy. However, with the increase of crucible usage, the
reaction of carbon, aluminum and titanium with B 2 O 3 weakens, and the boron element in the alloy tends to be stable.