Investigation of Oxide Inclusions and Primary Carbonitrides in Inconel 718 Superalloy Refined through Electroslag Remelting Process

The effect of remelting atmosphere and calcium treatment during electroslag remelting (ESR) of Inconel 718 superalloy on the oxide inclusions and primary carbonitrides was investigated. The results show that after ESR refining combined with calcium treatment, the original oxide inclusions in the ele...

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Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2012-12, Vol.43 (6), p.1596-1607
Main Authors: Chen, Xi-Chun, Shi, Cheng-Bin, Guo, Han-Jie, Wang, Fei, Ren, Hao, Feng, Di
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Language:English
Subjects:
Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Materials Science
Melting
Metallic Materials
Metallurgy
Metals. Metallurgy
Nanotechnology
Production of metals
Slag
Structural Materials
Superalloys
Surfaces and Interfaces
Thin Films
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cited_by cdi_FETCH-LOGICAL-c412t-c8abeac0ebed29217c15d9295682bd4e57897ad5b3e4c86ebec7a63e95d7a8ea3
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creator Chen, Xi-Chun
Shi, Cheng-Bin
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Wang, Fei
Ren, Hao
Feng, Di
description The effect of remelting atmosphere and calcium treatment during electroslag remelting (ESR) of Inconel 718 superalloy on the oxide inclusions and primary carbonitrides was investigated. The results show that after ESR refining combined with calcium treatment, the original oxide inclusions in the electrode, mainly MgO·Al 2 O 3 spinels and some MgO inclusions, were modified to CaO-Al 2 O 3 system inclusions or the inclusions of MgO·Al 2 O 3 spinel core surrounded by CaO-MgO-Al 2 O 3 system inclusion layer. Without the calcium treatment in ESR process, all the oxide inclusions in superalloy ingots are MgO·Al 2 O 3 spinels. All the oxide inclusions in ESR ingots act as the nucleation site for carbonitride (Nb,Ti)CN with two-layer structure precipitation, except for those with a single (Nb,Ti)CN layer containing a small amount of Ti and N in the ingot refined by a proper amount of calcium addition in ESR process. The carbonitrides (Nb,Ti)CN formed directly on the oxide inclusion have a small amount of Nb and C as well as a relatively fixed atomic ratio of Nb/Ti (about 0.6:1). There is a Nb-rich and C-rich (Nb,Ti)CN layer on the pre-existing (Nb,Ti)CN formed on the oxide inclusion. The size of the observed carbonitrides is in the range of 5 μ m to 15 μ m. The calcium treatment in the ESR process has a significant effect on the morphology of carbonitrides in superalloy ingot due to modification of oxide inclusions by Ca-treatment resulting in the change of precipitation and growth conditions for carbonitrides. The morphologies of carbonitrides were changed from clustered block or single octahedral to skeleton-like after calcium treatment.
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There is a Nb-rich and C-rich (Nb,Ti)CN layer on the pre-existing (Nb,Ti)CN formed on the oxide inclusion. The size of the observed carbonitrides is in the range of 5 μ m to 15 μ m. The calcium treatment in the ESR process has a significant effect on the morphology of carbonitrides in superalloy ingot due to modification of oxide inclusions by Ca-treatment resulting in the change of precipitation and growth conditions for carbonitrides. 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B, Process metallurgy and materials processing science</jtitle><stitle>Metall Mater Trans B</stitle><date>2012-12-01</date><risdate>2012</risdate><volume>43</volume><issue>6</issue><spage>1596</spage><epage>1607</epage><pages>1596-1607</pages><issn>1073-5615</issn><eissn>1543-1916</eissn><coden>MTTBCR</coden><abstract>The effect of remelting atmosphere and calcium treatment during electroslag remelting (ESR) of Inconel 718 superalloy on the oxide inclusions and primary carbonitrides was investigated. The results show that after ESR refining combined with calcium treatment, the original oxide inclusions in the electrode, mainly MgO·Al 2 O 3 spinels and some MgO inclusions, were modified to CaO-Al 2 O 3 system inclusions or the inclusions of MgO·Al 2 O 3 spinel core surrounded by CaO-MgO-Al 2 O 3 system inclusion layer. Without the calcium treatment in ESR process, all the oxide inclusions in superalloy ingots are MgO·Al 2 O 3 spinels. All the oxide inclusions in ESR ingots act as the nucleation site for carbonitride (Nb,Ti)CN with two-layer structure precipitation, except for those with a single (Nb,Ti)CN layer containing a small amount of Ti and N in the ingot refined by a proper amount of calcium addition in ESR process. The carbonitrides (Nb,Ti)CN formed directly on the oxide inclusion have a small amount of Nb and C as well as a relatively fixed atomic ratio of Nb/Ti (about 0.6:1). There is a Nb-rich and C-rich (Nb,Ti)CN layer on the pre-existing (Nb,Ti)CN formed on the oxide inclusion. The size of the observed carbonitrides is in the range of 5 μ m to 15 μ m. The calcium treatment in the ESR process has a significant effect on the morphology of carbonitrides in superalloy ingot due to modification of oxide inclusions by Ca-treatment resulting in the change of precipitation and growth conditions for carbonitrides. The morphologies of carbonitrides were changed from clustered block or single octahedral to skeleton-like after calcium treatment.</abstract><cop>Boston</cop><pub>Springer US</pub><doi>10.1007/s11663-012-9723-6</doi><tpages>12</tpages></addata></record>
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subjects Applied sciences
Characterization and Evaluation of Materials
Chemistry and Materials Science
Exact sciences and technology
Materials Science
Melting
Metallic Materials
Metallurgy
Metals. Metallurgy
Nanotechnology
Production of metals
Slag
Structural Materials
Superalloys
Surfaces and Interfaces
Thin Films
title Investigation of Oxide Inclusions and Primary Carbonitrides in Inconel 718 Superalloy Refined through Electroslag Remelting Process
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