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1.宝山钢铁股份有限公司研究院,上海 201999
2.上海交通大学 材料科学与工程学院,上海 200240
Published:15 September 2024,
Received:28 June 2024,
Revised:26 July 2024,
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陈濛潇.GH738返回料合金组织及纯净度的研究[J].分析测试学报,2024,43(09):1362-1369.
CHEN Meng-xiao.Investigation on Microstructure and Purity of GH738 Revert Alloy[J].Journal of Instrumental Analysis,2024,43(09):1362-1369.
陈濛潇.GH738返回料合金组织及纯净度的研究[J].分析测试学报,2024,43(09):1362-1369. DOI: 10.12452/j.fxcsxb.240625169.
CHEN Meng-xiao.Investigation on Microstructure and Purity of GH738 Revert Alloy[J].Journal of Instrumental Analysis,2024,43(09):1362-1369. DOI: 10.12452/j.fxcsxb.240625169.
该研究针对GH738合金不能直接使用的返回料进行了真空感应拼锭处理,并针对返回料拼锭再进行了电渣重熔。相应分析了双联工艺过程的化学成分变化,比较了感应拼块锭及电渣锭中的碳化物及非金属夹杂的差别,对比了枝晶组织的特征差异。返回料熔炼高温合金主要的问题在于其相对更高的N、O气体元素含量,需要在真空感应熔炼阶段严格控制以避免对成品性能的影响。经过电渣重熔后,枝晶生长有明显的取向性,且枝晶间析出的碳化物尺寸及数量均较真空感应熔炼状态有所增大,夹杂物分布相对也更加弥散且尺寸有所减小。最终验证了对于无法直接使用的返回料进行感应拼锭处理再作为高温合金冶炼原料的可行性。
In this study,vacuum induction melting(VIM) processing is used for the undirectly used revert of GH738 alloy,and electroslag remelting(ESR) processing is taken afterwards. Then the change of chemical composition during the whole process is analysed and the difference of carbides and nonmetallic inclusions in VIM ingot and ESR ingot is also investigated. The difference of dendrite character in VIM and ESR condition is studied as well.The main problem is the relatively higher N and O content,which needs to be strictly controlled in the VIM stage to avoid the impact on the properties of the finished products. After electroslag remelting,the dendrite growth has obvious orientation,and the size and quantity of carbide precipitates between dendrites is increased compared with the vacuum induction melting state,the inclusions distribution is relatively more dispersed and the size is also reduced at the same time. At last we come to a conclusion that to the undirectly usable revert,by adding the VIM processing and then can be used as the raw material of superalloy production.
返回料夹杂物真空感应电渣重熔
revertinclusionsvacuum induction meltingelectroslag remelting
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