Cargando…

Tempforming Strengthening of a Low-Alloy Steel

Low-alloy structural steels subjected to quenching and tempering to achieve high strength possess a common drawback associated with low-impact toughness at low temperatures. An additional warm rolling, i.e., tempforming, is a promising approach to strengthen the rolled semi-products along with incre...

Descripción completa

Detalles Bibliográficos
Autores principales: Dolzhenko, Anastasiia, Kaibyshev, Rustam, Belyakov, Andrey
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9369821/
https://www.ncbi.nlm.nih.gov/pubmed/35955175
http://dx.doi.org/10.3390/ma15155241
_version_ 1784766591732285440
author Dolzhenko, Anastasiia
Kaibyshev, Rustam
Belyakov, Andrey
author_facet Dolzhenko, Anastasiia
Kaibyshev, Rustam
Belyakov, Andrey
author_sort Dolzhenko, Anastasiia
collection PubMed
description Low-alloy structural steels subjected to quenching and tempering to achieve high strength possess a common drawback associated with low-impact toughness at low temperatures. An additional warm rolling, i.e., tempforming, is a promising approach to strengthen the rolled semi-products along with increasing their impact toughness. The effect of tempforming at 823–923 K on the microstructures and the mechanical properties of a low-alloy steel was studied in comparison with ordinary tempering at the same temperatures. The tempformed microstructures consisted of highly flattened grains with a transverse grain size of 245 nm to 360 nm depending on tempering temperature. A decrease in the transverse grain size with a decreasing temperature was accompanied by an increase in the total dislocation density (including sub-boundary dislocations) from 3.3 × 10(15) m(−2) to 5.9 × 10(15) m(−2). The steel samples subjected to tempforming exhibited enhanced mechanical properties. The yield strength increased by more than 300 MPa, approaching about 1200–1500 MPa depending on tempforming temperature. Moreover, strengthening by tempforming was accompanied by an increase in the impact toughness, especially inthe low temperature range down to 77 K, where the impact toughness was above 80 J cm(−2).
format Online
Article
Text
id pubmed-9369821
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-93698212022-08-12 Tempforming Strengthening of a Low-Alloy Steel Dolzhenko, Anastasiia Kaibyshev, Rustam Belyakov, Andrey Materials (Basel) Article Low-alloy structural steels subjected to quenching and tempering to achieve high strength possess a common drawback associated with low-impact toughness at low temperatures. An additional warm rolling, i.e., tempforming, is a promising approach to strengthen the rolled semi-products along with increasing their impact toughness. The effect of tempforming at 823–923 K on the microstructures and the mechanical properties of a low-alloy steel was studied in comparison with ordinary tempering at the same temperatures. The tempformed microstructures consisted of highly flattened grains with a transverse grain size of 245 nm to 360 nm depending on tempering temperature. A decrease in the transverse grain size with a decreasing temperature was accompanied by an increase in the total dislocation density (including sub-boundary dislocations) from 3.3 × 10(15) m(−2) to 5.9 × 10(15) m(−2). The steel samples subjected to tempforming exhibited enhanced mechanical properties. The yield strength increased by more than 300 MPa, approaching about 1200–1500 MPa depending on tempforming temperature. Moreover, strengthening by tempforming was accompanied by an increase in the impact toughness, especially inthe low temperature range down to 77 K, where the impact toughness was above 80 J cm(−2). MDPI 2022-07-29 /pmc/articles/PMC9369821/ /pubmed/35955175 http://dx.doi.org/10.3390/ma15155241 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dolzhenko, Anastasiia
Kaibyshev, Rustam
Belyakov, Andrey
Tempforming Strengthening of a Low-Alloy Steel
title Tempforming Strengthening of a Low-Alloy Steel
title_full Tempforming Strengthening of a Low-Alloy Steel
title_fullStr Tempforming Strengthening of a Low-Alloy Steel
title_full_unstemmed Tempforming Strengthening of a Low-Alloy Steel
title_short Tempforming Strengthening of a Low-Alloy Steel
title_sort tempforming strengthening of a low-alloy steel
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9369821/
https://www.ncbi.nlm.nih.gov/pubmed/35955175
http://dx.doi.org/10.3390/ma15155241
work_keys_str_mv AT dolzhenkoanastasiia tempformingstrengtheningofalowalloysteel
AT kaibyshevrustam tempformingstrengtheningofalowalloysteel
AT belyakovandrey tempformingstrengtheningofalowalloysteel