Diametral strain response and microstructural yielding mechanisms of a bainitic pressure vessel steel

Klaus Rahka, Jussi Solin, Markku Kemppainen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Unexpected trends of diametral strain range response have been recorded for annealed bainitic Cr-Mo-V-pressure vessel steel at room temperature and moderate strain amplitudes.
Stress and diametral strain response were also recorded for three harder heat treatment variants, but they behaved as expected. The alloy is strengthened by a carbide dispersion and a dislocation network, both of variable density. The unexpected diametral strain response is suggested to be associated with yet unknown macroscopic effects of particular observed microscopic mechanisms of slip.
These mechanisms of slip can be analyzed with a model for dispersion strengthening which expresses the connection between nominal dislocation activity and the plastic and elastic components of elongation. The necessity for a differentiation between effective obstacles to slip consisting of stable carbides or cyclically unstable dislocation networks is arrived at.
Observation of slip mechanisms by scanning electron microscopy is presented.
Original languageEnglish
Pages (from-to)44-58
JournalJournal of Testing and Evaluation
Volume16
Issue number1
DOIs
Publication statusPublished - 1988
MoE publication typeA1 Journal article-refereed

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Steel structures
Carbides
Elongation
Heat treatment
Plastics
Scanning electron microscopy
Temperature

Cite this

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title = "Diametral strain response and microstructural yielding mechanisms of a bainitic pressure vessel steel",
abstract = "Unexpected trends of diametral strain range response have been recorded for annealed bainitic Cr-Mo-V-pressure vessel steel at room temperature and moderate strain amplitudes. Stress and diametral strain response were also recorded for three harder heat treatment variants, but they behaved as expected. The alloy is strengthened by a carbide dispersion and a dislocation network, both of variable density. The unexpected diametral strain response is suggested to be associated with yet unknown macroscopic effects of particular observed microscopic mechanisms of slip. These mechanisms of slip can be analyzed with a model for dispersion strengthening which expresses the connection between nominal dislocation activity and the plastic and elastic components of elongation. The necessity for a differentiation between effective obstacles to slip consisting of stable carbides or cyclically unstable dislocation networks is arrived at. Observation of slip mechanisms by scanning electron microscopy is presented.",
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Diametral strain response and microstructural yielding mechanisms of a bainitic pressure vessel steel. / Rahka, Klaus; Solin, Jussi; Kemppainen, Markku.

In: Journal of Testing and Evaluation, Vol. 16, No. 1, 1988, p. 44-58.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Diametral strain response and microstructural yielding mechanisms of a bainitic pressure vessel steel

AU - Rahka, Klaus

AU - Solin, Jussi

AU - Kemppainen, Markku

PY - 1988

Y1 - 1988

N2 - Unexpected trends of diametral strain range response have been recorded for annealed bainitic Cr-Mo-V-pressure vessel steel at room temperature and moderate strain amplitudes. Stress and diametral strain response were also recorded for three harder heat treatment variants, but they behaved as expected. The alloy is strengthened by a carbide dispersion and a dislocation network, both of variable density. The unexpected diametral strain response is suggested to be associated with yet unknown macroscopic effects of particular observed microscopic mechanisms of slip. These mechanisms of slip can be analyzed with a model for dispersion strengthening which expresses the connection between nominal dislocation activity and the plastic and elastic components of elongation. The necessity for a differentiation between effective obstacles to slip consisting of stable carbides or cyclically unstable dislocation networks is arrived at. Observation of slip mechanisms by scanning electron microscopy is presented.

AB - Unexpected trends of diametral strain range response have been recorded for annealed bainitic Cr-Mo-V-pressure vessel steel at room temperature and moderate strain amplitudes. Stress and diametral strain response were also recorded for three harder heat treatment variants, but they behaved as expected. The alloy is strengthened by a carbide dispersion and a dislocation network, both of variable density. The unexpected diametral strain response is suggested to be associated with yet unknown macroscopic effects of particular observed microscopic mechanisms of slip. These mechanisms of slip can be analyzed with a model for dispersion strengthening which expresses the connection between nominal dislocation activity and the plastic and elastic components of elongation. The necessity for a differentiation between effective obstacles to slip consisting of stable carbides or cyclically unstable dislocation networks is arrived at. Observation of slip mechanisms by scanning electron microscopy is presented.

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DO - 10.1520/JTE11051J

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JO - Journal of Testing and Evaluation

JF - Journal of Testing and Evaluation

SN - 0090-3973

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