Changes in morphology and composition of carbides during cyclic deformation at room and elevated temperature and their effect on mechanical properties of Cr-Mo-V steel

Zhong-Ghuang Wang, Klaus Rahka, Pertti Nenonen, Campbell Laird

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Cr-Mo-V rotor steel has been cycled in total axial strain control at room and elevated temperature with and without holds in tension. We have studied by TEM/EDS techniques the changes in carbide morphology and composition produced by these exposures. The carbide morphology has been found to change, even at room temperature, from anisotropic morphology to more equiaxed forms, and the compositions of the carbides have become enriched with Mo and V, at rates which are orders of magnitude greater than would be observed in conventional tempering processes. Naturally the effects of high temperature and tests with holds have been to accelerate these changes. This applies particularly to the redistribution of Mo which can be associated with a possible fatigue-induced decline in ductility. One explanation of this behavior is the elimination of the impurity-scavenging action of the Mo as it is absorbed into the previously existing carbides and as it forms new carbides.

Original languageEnglish
Pages (from-to)2129 - 2141
Number of pages13
JournalActa Metallurgica
Volume33
Issue number12
DOIs
Publication statusPublished - 1985
MoE publication typeNot Eligible

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Steel
Carbides
Mechanical properties
Chemical analysis
Temperature
Strain control
Scavenging
Tempering
Ductility
Energy dispersive spectroscopy
Rotors
Fatigue of materials
Impurities
Transmission electron microscopy

Cite this

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title = "Changes in morphology and composition of carbides during cyclic deformation at room and elevated temperature and their effect on mechanical properties of Cr-Mo-V steel",
abstract = "Cr-Mo-V rotor steel has been cycled in total axial strain control at room and elevated temperature with and without holds in tension. We have studied by TEM/EDS techniques the changes in carbide morphology and composition produced by these exposures. The carbide morphology has been found to change, even at room temperature, from anisotropic morphology to more equiaxed forms, and the compositions of the carbides have become enriched with Mo and V, at rates which are orders of magnitude greater than would be observed in conventional tempering processes. Naturally the effects of high temperature and tests with holds have been to accelerate these changes. This applies particularly to the redistribution of Mo which can be associated with a possible fatigue-induced decline in ductility. One explanation of this behavior is the elimination of the impurity-scavenging action of the Mo as it is absorbed into the previously existing carbides and as it forms new carbides.",
author = "Zhong-Ghuang Wang and Klaus Rahka and Pertti Nenonen and Campbell Laird",
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Changes in morphology and composition of carbides during cyclic deformation at room and elevated temperature and their effect on mechanical properties of Cr-Mo-V steel. / Wang, Zhong-Ghuang; Rahka, Klaus; Nenonen, Pertti; Laird, Campbell.

In: Acta Metallurgica, Vol. 33, No. 12, 1985, p. 2129 - 2141.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Changes in morphology and composition of carbides during cyclic deformation at room and elevated temperature and their effect on mechanical properties of Cr-Mo-V steel

AU - Wang, Zhong-Ghuang

AU - Rahka, Klaus

AU - Nenonen, Pertti

AU - Laird, Campbell

PY - 1985

Y1 - 1985

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AB - Cr-Mo-V rotor steel has been cycled in total axial strain control at room and elevated temperature with and without holds in tension. We have studied by TEM/EDS techniques the changes in carbide morphology and composition produced by these exposures. The carbide morphology has been found to change, even at room temperature, from anisotropic morphology to more equiaxed forms, and the compositions of the carbides have become enriched with Mo and V, at rates which are orders of magnitude greater than would be observed in conventional tempering processes. Naturally the effects of high temperature and tests with holds have been to accelerate these changes. This applies particularly to the redistribution of Mo which can be associated with a possible fatigue-induced decline in ductility. One explanation of this behavior is the elimination of the impurity-scavenging action of the Mo as it is absorbed into the previously existing carbides and as it forms new carbides.

U2 - 10.1016/0001-6160(85)90174-9

DO - 10.1016/0001-6160(85)90174-9

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