Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears

Abstract A time-of-flight Bragg-edge neutron transmission imaging was used to investigate the microstructure and strain distributions in a gear hardened by a newly developed two-step induction-heating method: precursor (Sample 1) and final product (Sample 2). The edge-position and edge-broadening we...

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Autores principales:	Yuhua Su, Kenichi Oikawa, Takenao Shinohara, Tetsuya Kai, Takashi Horino, Osamu Idohara, Yoshitaka Misaka, Yo Tomota
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/21fe55fed68d4c02906c743569552e07
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spelling	oai:doaj.org-article:21fe55fed68d4c02906c743569552e072021-12-02T12:11:34ZNeutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears10.1038/s41598-021-83555-92045-2322https://doaj.org/article/21fe55fed68d4c02906c743569552e072021-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-83555-9https://doaj.org/toc/2045-2322Abstract A time-of-flight Bragg-edge neutron transmission imaging was used to investigate the microstructure and strain distributions in a gear hardened by a newly developed two-step induction-heating method: precursor (Sample 1) and final product (Sample 2). The edge-position and edge-broadening were determined and mapped with high spatial resolution, which enabled us to confirm the two-dimensional distributions of the microstructure and residual strain. A deep hardened layer was made for Sample 1 in which martensite was formed on the entire teeth and the outer peripheral portion of the gear body. Sample 2 was subjected to double induction-hardening, where a tempered martensite was formed as the thermal refined microstructure between a fine-grained martensite at the tooth surface and a ferrite-pearlite microstructure at the core. The relationship between edge-broadening and the Vickers hardness described by a linear equation was employed to derive the elastic residual strain. The residual strain map for Sample 2 revealed that a steep compressive strain was introduced into the fine-grained martensite at the tooth surface by the super rapid induction-heating and quenching process. The reversal of tension was speculated to occur below 2 mm from the tooth tip, and the strain was almost zero in the core region.Yuhua SuKenichi OikawaTakenao ShinoharaTetsuya KaiTakashi HorinoOsamu IdoharaYoshitaka MisakaYo TomotaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yuhua Su Kenichi Oikawa Takenao Shinohara Tetsuya Kai Takashi Horino Osamu Idohara Yoshitaka Misaka Yo Tomota Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
description	Abstract A time-of-flight Bragg-edge neutron transmission imaging was used to investigate the microstructure and strain distributions in a gear hardened by a newly developed two-step induction-heating method: precursor (Sample 1) and final product (Sample 2). The edge-position and edge-broadening were determined and mapped with high spatial resolution, which enabled us to confirm the two-dimensional distributions of the microstructure and residual strain. A deep hardened layer was made for Sample 1 in which martensite was formed on the entire teeth and the outer peripheral portion of the gear body. Sample 2 was subjected to double induction-hardening, where a tempered martensite was formed as the thermal refined microstructure between a fine-grained martensite at the tooth surface and a ferrite-pearlite microstructure at the core. The relationship between edge-broadening and the Vickers hardness described by a linear equation was employed to derive the elastic residual strain. The residual strain map for Sample 2 revealed that a steep compressive strain was introduced into the fine-grained martensite at the tooth surface by the super rapid induction-heating and quenching process. The reversal of tension was speculated to occur below 2 mm from the tooth tip, and the strain was almost zero in the core region.
format	article
author	Yuhua Su Kenichi Oikawa Takenao Shinohara Tetsuya Kai Takashi Horino Osamu Idohara Yoshitaka Misaka Yo Tomota
author_facet	Yuhua Su Kenichi Oikawa Takenao Shinohara Tetsuya Kai Takashi Horino Osamu Idohara Yoshitaka Misaka Yo Tomota
author_sort	Yuhua Su
title	Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
title_short	Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
title_full	Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
title_fullStr	Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
title_full_unstemmed	Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
title_sort	neutron bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/21fe55fed68d4c02906c743569552e07
work_keys_str_mv	AT yuhuasu neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT kenichioikawa neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT takenaoshinohara neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT tetsuyakai neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT takashihorino neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT osamuidohara neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT yoshitakamisaka neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears AT yotomota neutronbraggedgetransmissionimagingformicrostructureandresidualstrainininductionhardenedgears
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Neutron Bragg-edge transmission imaging for microstructure and residual strain in induction hardened gears

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