GH3128合金“VIM+ESR”和“NVIM+ESR”冶炼过程中的脱气行为及夹杂物研究

Study on Degassing Behavior and Inclusion in“VIM+ESR”and“NVIM+ESR”Smelting Processes of GH3128 Alloy

利用氧氮分析仪对"真空感应熔炼+电渣重熔"(VIM+ESR)和"非真空感应熔炼+电渣重熔"(NVIM+ESR)两种冶炼工艺下冶炼GH3128合金中的氧含量、氮含量进行检测,并进行了脱氧、脱氮的热力学计算;利用ASPEX扫描电镜分析了两种冶炼工艺下GH3128合金中夹杂物的成分、尺寸分布以及数量。结果表明,采用"VIM+ESR"工艺更能有效的去除合金液中的氮,夹杂物类型主要是Al-Ti-O型复合氧化物夹杂,还有少部分的Al2O3、TiOx氧化物夹杂,而采用"NVIM+ESR"的双联工艺,合金中产生的夹杂除氧化物夹杂类,还有硫化物、氮化物夹杂;且采用真空冶炼工艺更能有效降低夹杂物数量,并细化夹杂物。

The oxygen and nitrogen content of GH3128 alloy with two smelting processes of"VIM+ESR"and"NVIM+ESR"are measured by oxygen nitrogen analyzer,and the thermodynamic calculation of deoxidation and denitrification has been carried out.The composition,size distribution and quantity of inclusions in GH3128 alloy with two smelting processes are analyzed by ASPEX SEM.The results show that:The process of"VIM+ESR"can remove the N in the alloy more effectively,the inclusions are mainly Al-Ti-O composite oxide inclusions,with a small number of Al2 O3 and TiOx oxide inclusions,the inclusions in alloy by process of"NVIM+ESR"are not only oxide inclusions,but also sulfide and nitride inclusions.And uses the vacuum smelting process can effectively reduce the number of inclusions,and refine the inclusion.