摘要
研究了不同电子束精炼参数对熔体凝固过程中夹杂物的类型、数量和尺寸分布等影响机制。通过对不同功率精炼后FGH4096合金中O和N含量以及夹杂物的类型、数量和尺寸分布进行了统计分析,结合夹杂物生长动力学揭示了电子束精炼功率对夹杂物生长的影响。电子束精炼制备的FGH4096合金中碳氮化合物和复合相夹杂物的数量密度在夹杂物中占比最大,两者占比达到了95.53%。在碳氮化合物和复合相夹杂物中,TiN-TiC、TiN-(Ti,M)C和Al_(2)O_(3)-TiN-(Ti,M)C的占比较大。夹杂物生长动力学计算结果表明,功率从9 kW增加到12 kW时,由于功率的增加提升了夹杂物形成元素的去除效率,限制夹杂物生长所需的元素含量、降低夹杂物的形成温度从而缩短其生长温度区间。此外,由于冷速变化较小导致夹杂物的生长时间较短,夹杂物尺寸减小。而当功率从12 kW增加到15 kW时,O和N含量降幅较小而熔体冷速的降幅较大,导致夹杂物的生长时间延长。这降低了杂质元素含量去除所带来的影响,夹杂物尺寸增大。
The effect of different electron beam refining parameters on the type,quantity and size distribution of inclusions during melt solidification was studied.The content of O and N in FGH4096 alloy and the type,quantity and size distribution of inclusions after different power refining were statistically analyzed,and the mechanism of influence of power on inclusions growth during electron beam refining was revealed in combination with the growth kinetics of inclusions.The number density of carbon and nitrogen compounds and complex phase inclusions in FGH4096 alloys prepared by electron beam refining was the largest,and the proportion of both was 95.53%.In the carbon nitrogen compounds and complex phase inclusions,TiN-TiC,TiN-(Ti,M)C and Al_(2)O_(3)-TiN-(Ti,M)C occupied a large proportion.The inclusions growth kinetics calculations showed that when the power increased from 9 kW to 12 kW,the increased power improved the removal effect of the inclusions forming elements,limited the elemental content required for the growth of inclusions,reduced the formation temperature of inclusions and thus reduced its growth temperature range,and led to a reduced growth time and size of inclusions due to the small change in the cooling rate additionally.However,when the power 12 kW increased to 15 kW,the O and N content decreased less while the melt cooling rate decreased larger,resulting in an increased growth time of the inclusion.It reduced the effect of the removal of impurity element content,with an increase in the size of inclusions.
作者
董立阳
游小刚
董庚益
王轶农
谭毅
Dong Liyang;You Xiaogang;Dong Gengyi;Wang Yinong;Tan Yi(School of Materials Science and Engineering,Dalian University of Technology,Dalian 116024,China;Zhongyuan Critical Metals Laboratory,Zhengzhou University,Zhengzhou 450001,China)
出处
《特殊钢》
2024年第4期47-54,共8页
Special Steel
基金
国家重点研发计划资助项目(2019YFA0705300)。
