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The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy / Soran, Birosca

Acta Materialia, Volume: 148, Pages: 391 - 406

Swansea University Author: Soran, Birosca

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Abstract

Nickel-based superalloy IN713C produced through investment casting route is widely used for turbocharger turbine wheels in the automotive industry. The produced microstructure and microtexture are not homogeneous across the turbine component due to geometrical factors and localised cooling rate duri...

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Published in: Acta Materialia
ISSN: 1359-6454
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa38362
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spelling 2019-07-29T11:36:27.1854290 v2 38362 2018-01-31 The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy 3445603fcc2ff9d27b476a73b223a507 0000-0002-8380-771X Soran Birosca Soran Birosca true false 2018-01-31 EEN Nickel-based superalloy IN713C produced through investment casting route is widely used for turbocharger turbine wheels in the automotive industry. The produced microstructure and microtexture are not homogeneous across the turbine component due to geometrical factors and localised cooling rate during the casting process, which give rise to inhomogeneous deformation during service. In the present paper, two kinds of in-house fatigue tests, Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF), were conducted at 600 °C in attempt to simulate the actual fatigue conditions experienced by turbine wheels in turbocharger. From Geometrically Necessary Dislocation (GND) distributions and strain analyses, it is concluded that microstructure heterogeneity such as carbide precipitates distribution within dendritic structure network determine the failure micromechanics during LCF tests. In the early stage of LCF loading, crack principally initiated within near surface carbides that have been oxidised during high temperature exposure. The higher GND density at the tip of carbide precipitates due to oxidation volume expansion are found to facilitate easy cracks initiation and propagation. Moreover, the cluster-like carbides network and its distribution can accelerate oxidation process and crack growth effectively. Furthermore, in the later stage of crack propagation during LCF, the weak interdendrite areas rotate to accommodate increased strain leading to faster cracks propagation and hence final catastrophic failure. Serial section technique for 3-D visualisation was employed to investigate the crystallographic grain orientation correlation with fracture mechanics during HCF loading. It appears that the microtexure and grain orientations are more critical than the alloy microstructure in an area with a relatively uniform carbides distribution and weak dendrite structure where HCF failure occurred. Based on the slip trace analysis, it was found that most faceting occurred in Goss grains (<110>//LD) and on slip system with the highest Schmid factor. It is concluded that cracks were initiated on planes with high Schmid factors and assisted by the presence of porosity. Journal Article Acta Materialia 148 391 406 1359-6454 15 4 2018 2018-04-15 10.1016/j.actamat.2018.01.062 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2019-07-29T11:36:27.1854290 2018-01-31T15:54:10.4518704 College of Engineering Engineering Soran Birosca 0000-0002-8380-771X 1 0038362-31012018155628.pdf liu2018.pdf 2018-01-31T15:56:28.5770000 Output 8332937 application/pdf Accepted Manuscript true 2019-02-16T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
spellingShingle The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
Soran, Birosca
title_short The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
title_full The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
title_fullStr The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
title_full_unstemmed The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
title_sort The effects of microstructure and microtexture generated during solidification on deformation micromechanism in IN713C nickel-based superalloy
author_id_str_mv 3445603fcc2ff9d27b476a73b223a507
author_id_fullname_str_mv 3445603fcc2ff9d27b476a73b223a507_***_Soran, Birosca
author Soran, Birosca
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publishDate 2018
institution Swansea University
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college_str College of Engineering
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hierarchy_top_title College of Engineering
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description Nickel-based superalloy IN713C produced through investment casting route is widely used for turbocharger turbine wheels in the automotive industry. The produced microstructure and microtexture are not homogeneous across the turbine component due to geometrical factors and localised cooling rate during the casting process, which give rise to inhomogeneous deformation during service. In the present paper, two kinds of in-house fatigue tests, Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF), were conducted at 600 °C in attempt to simulate the actual fatigue conditions experienced by turbine wheels in turbocharger. From Geometrically Necessary Dislocation (GND) distributions and strain analyses, it is concluded that microstructure heterogeneity such as carbide precipitates distribution within dendritic structure network determine the failure micromechanics during LCF tests. In the early stage of LCF loading, crack principally initiated within near surface carbides that have been oxidised during high temperature exposure. The higher GND density at the tip of carbide precipitates due to oxidation volume expansion are found to facilitate easy cracks initiation and propagation. Moreover, the cluster-like carbides network and its distribution can accelerate oxidation process and crack growth effectively. Furthermore, in the later stage of crack propagation during LCF, the weak interdendrite areas rotate to accommodate increased strain leading to faster cracks propagation and hence final catastrophic failure. Serial section technique for 3-D visualisation was employed to investigate the crystallographic grain orientation correlation with fracture mechanics during HCF loading. It appears that the microtexure and grain orientations are more critical than the alloy microstructure in an area with a relatively uniform carbides distribution and weak dendrite structure where HCF failure occurred. Based on the slip trace analysis, it was found that most faceting occurred in Goss grains (<110>//LD) and on slip system with the highest Schmid factor. It is concluded that cracks were initiated on planes with high Schmid factors and assisted by the presence of porosity.
published_date 2018-04-15T18:58:29Z
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