真空感应炉熔炼Inconel713C氧氮含量控制工艺

Removal of O/N-Impurities in Molten Inconel713C Alloy by Carbon Reduction

研究了150 kg真空感应炉熔炼Inconel713C氧、氮含量控制工艺,设计了四种不同的熔炼方案,研究了熔化时间、精炼前碳的加入量、精炼参数等因素对Inconel713C氧、氮含量的影响。结果表明,将0.14%/(质量比).脱氧剂碳随原料加入炉内,熔化时间为80 min,全熔后在钢液中加入0.03%.脱氧剂碳,在精炼温度为1450℃下精炼25 min,精炼后钢液中氧、氮含量均可控制在10×10^-6以内。

The Inconel713 C Ni-based cast supper-alloy,a high-tech material in space/aircraft/automobile/ship-building industries,was refined by removing O/N impurities in vacuum induction furnace.The influence of the refining conditions,including the timing/content of carbon addition,melting-rate,reduction temperature/time,on the O/N-contents was investigated.The results show that the refining conditions had a major impact.To be specific,as the melting time increased,the O-content changed in a decrease-increase mode,accompanied by a linear decrease of N-content.The Inconel713 C alloy with the O/N contents below 10×10^-6 was produced under the optimized conditions in 3-step:first,the raw materials mixed with 0.14%(wt)of carbon powder were pre-reduced and completely melted for 80 min in vacuum induction furnace,next,0.03%of carbon powder was added into the molten alloy,and finally,the molten C-added Inconel713 C alloy was reduced at 1450℃for 25 min.