Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel

SA508-4 N steel is considered a novel Ni–Cr–Mo low-alloy steel for reactor pressure vessels. The low-temperature embrittlement in the steel is an important issue that needs to be addressed. Herein, the main aim of this work is to investigate the non-hardening embrittlement caused by grain boundary s...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Kai Wang, Yu Guo, Shenhua Song
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	RPV steel Embrittlement Ductile-to-brittle transition Grain boundary segregation Auger electron spectroscopy Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/65e2c6b5f03942ef90088fd7f2a42478
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:65e2c6b5f03942ef90088fd7f2a42478
record_format	dspace
spelling	oai:doaj.org-article:65e2c6b5f03942ef90088fd7f2a424782021-12-04T04:34:31ZQuantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel2238-785410.1016/j.jmrt.2021.11.092https://doaj.org/article/65e2c6b5f03942ef90088fd7f2a424782021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2238785421013697https://doaj.org/toc/2238-7854SA508-4 N steel is considered a novel Ni–Cr–Mo low-alloy steel for reactor pressure vessels. The low-temperature embrittlement in the steel is an important issue that needs to be addressed. Herein, the main aim of this work is to investigate the non-hardening embrittlement caused by grain boundary segregation (GBS) of P in a P-doped SA508-4 N steel with the use of impact testing in conjunction with Auger electron spectroscopy (AES) and microstructural characterization. The steel samples are quenched from 1000 °C, followed by tempering at 650 °C and subsequent ageing at different lower temperatures. The ductile-to-brittle transition temperatures (DBTTs) of the aged specimens are determined by mini-Charpy impact testing (specimen: 2.5 mm × 2.5 mm in cross section), and the GBS of P is evaluated using AES. The results show that there is a linear dependence of DBTT (oC) on the boundary concentration of P (Cp/at.%), when the steel hardness is fixed after the 650 °C-tempering (∼260 HV10), being expressed as DBTT=13.31Cp−339.28. Employing this relation, one can forecast the DBTT once the boundary level of P is known. With the DBTT−segregation relation in combination with segregation thermodynamics and kinetics, a time–temperature embrittlement diagram is also developed. This may be employed to predict the tendency of embrittlement in the steel, caused by GBS of P after serving at a temperature. It is believed that this study is helpful in monitoring the safe operation of devices manufactured with this novel low-alloy steel.Kai WangYu GuoShenhua SongElsevierarticleRPV steelEmbrittlementDuctile-to-brittle transitionGrain boundary segregationAuger electron spectroscopyMining engineering. MetallurgyTN1-997ENJournal of Materials Research and Technology, Vol 15, Iss , Pp 6404-6414 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	RPV steel Embrittlement Ductile-to-brittle transition Grain boundary segregation Auger electron spectroscopy Mining engineering. Metallurgy TN1-997
spellingShingle	RPV steel Embrittlement Ductile-to-brittle transition Grain boundary segregation Auger electron spectroscopy Mining engineering. Metallurgy TN1-997 Kai Wang Yu Guo Shenhua Song Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel
description	SA508-4 N steel is considered a novel Ni–Cr–Mo low-alloy steel for reactor pressure vessels. The low-temperature embrittlement in the steel is an important issue that needs to be addressed. Herein, the main aim of this work is to investigate the non-hardening embrittlement caused by grain boundary segregation (GBS) of P in a P-doped SA508-4 N steel with the use of impact testing in conjunction with Auger electron spectroscopy (AES) and microstructural characterization. The steel samples are quenched from 1000 °C, followed by tempering at 650 °C and subsequent ageing at different lower temperatures. The ductile-to-brittle transition temperatures (DBTTs) of the aged specimens are determined by mini-Charpy impact testing (specimen: 2.5 mm × 2.5 mm in cross section), and the GBS of P is evaluated using AES. The results show that there is a linear dependence of DBTT (oC) on the boundary concentration of P (Cp/at.%), when the steel hardness is fixed after the 650 °C-tempering (∼260 HV10), being expressed as DBTT=13.31Cp−339.28. Employing this relation, one can forecast the DBTT once the boundary level of P is known. With the DBTT−segregation relation in combination with segregation thermodynamics and kinetics, a time–temperature embrittlement diagram is also developed. This may be employed to predict the tendency of embrittlement in the steel, caused by GBS of P after serving at a temperature. It is believed that this study is helpful in monitoring the safe operation of devices manufactured with this novel low-alloy steel.
format	article
author	Kai Wang Yu Guo Shenhua Song
author_facet	Kai Wang Yu Guo Shenhua Song
author_sort	Kai Wang
title	Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel
title_short	Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel
title_full	Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel
title_fullStr	Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel
title_full_unstemmed	Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel
title_sort	quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel ni–cr–mo rpv steel
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/65e2c6b5f03942ef90088fd7f2a42478
work_keys_str_mv	AT kaiwang quantitativedependenceofductiletobrittletransitiononphosphorusgrainboundarysegregationforanovelnicrmorpvsteel AT yuguo quantitativedependenceofductiletobrittletransitiononphosphorusgrainboundarysegregationforanovelnicrmorpvsteel AT shenhuasong quantitativedependenceofductiletobrittletransitiononphosphorusgrainboundarysegregationforanovelnicrmorpvsteel
_version_	1718372970701783040

Quantitative dependence of ductile-to-brittle transition on phosphorus grain boundary segregation for a novel Ni–Cr–Mo RPV steel

Ejemplares similares