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Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

1
Departamento de Engenharia Química e de Materiais—PUC-Rio—DEQM, Pontifícia Universidade Católica do Rio de Janeiro, 222541-900 Rio de Janeiro-RJ, Brazil
2
Centro Brasileiro de Pesquisas Físicas (CBPF), 22290-180 Rio de Janeiro-RJ, Brazil
3
Instituto Nacional de Metrologia, Qualidade e Tecnologia—INMETRO/RJ, 25250-020 Rio de Janeiro-RJ, Brazil
*
Author to whom correspondence should be addressed.
Metals 2018, 8(3), 168; https://doi.org/10.3390/met8030168
Received: 30 November 2017 / Revised: 21 February 2018 / Accepted: 24 February 2018 / Published: 9 March 2018
(This article belongs to the Special Issue Mechanical Behavior of High-Strength Low-Alloy Steels)
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Abstract

This study discusses the use of the Morrison model to estimate the strain-hardening exponent (n) in the presence of precipitation hardening for an API X80 steel pipe. As the grain size becomes larger, high values of n are expected according to the Morrison equation. However, the grain size alone is not sufficient to explain the changes of the strain-hardening exponent (n) after hot-induction bending. The vanadium in the ferritic solid solution has an important influence on the decrease of the precipitation hardening, and consequently on the increase of the values of n, despite the refinement of the grain size and high dislocation densities. Therefore, the effects of grain boundaries on the capability to uniformly distribute deformations within the plastic regime become negligible, which limits the application of the Morrison model to estimate the values of n. View Full-Text
Keywords: API X80 steel; strain-hardening exponent; high-frequency hot-induction bending; thermal treatments API X80 steel; strain-hardening exponent; high-frequency hot-induction bending; thermal treatments
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Silva, R.A.; Pinto, A.L.; Kuznetsov, A.; Bott, I.S. Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending. Metals 2018, 8, 168.

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