Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel

From the standpoint of evaluating Type IV creep damage in the fine-grained heat affected zones (FGHAZ) of welded joints, an analysis method combining continuum damage mechanics (CDM) and a cavity nucleation model is proposed and applied to the creep testing of simulated-FGHAZ notched bars of mod. 9C...

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Autores principales:	Takashi HONDA, Takuya FUKAHORI, Toshihide IGARI, Yasuharu CHUMAN, Takumi TOKIYOSHI, Alan CF COCKS
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	creep creep damage creep cavity creep void type iv modified 9cr-1mo steel welded joints damage mechanics Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/820072fda41e4d2fb7f81b88f24a1f22
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spelling	oai:doaj.org-article:820072fda41e4d2fb7f81b88f24a1f222021-11-26T07:11:27ZCreep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel2187-974510.1299/mej.16-00697https://doaj.org/article/820072fda41e4d2fb7f81b88f24a1f222017-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/5/4_16-00697/_pdf/-char/enhttps://doaj.org/toc/2187-9745From the standpoint of evaluating Type IV creep damage in the fine-grained heat affected zones (FGHAZ) of welded joints, an analysis method combining continuum damage mechanics (CDM) and a cavity nucleation model is proposed and applied to the creep testing of simulated-FGHAZ notched bars of mod. 9Cr-1Mo steel at 650°C. The Perrin-Hayhurst CDM model is adopted, which considers both softening by precipitate coarsening and damage by creep cavities. For the cavity nucleation model, a proposal by Gonzalez and Cocks is employed, which considers the randomness of grain-boundary-facet orientations in a polycrystalline material and gives a nucleation rate that is a function of the creep strain rate and a tri-axiality factor. The critical value of the damage parameter, corresponding to the initiation of micro cracks due to the coalescence of creep cavities, is expressed in terms of a critical value of the number density of creep cavities as determined from grain-boundary-resistance model simulations by the present authors. Creep rupture experiments have been conducted for circumferentially notched bar specimens with two kinds of notch acuities. The applicability of the combined CDM and cavity nucleation model is demonstrated by comparing the distribution of creep cavities observed experimentally with the simulation results. The final rupture life of the circumferentially notched bar specimens was also predicted to within a factor of two.Takashi HONDATakuya FUKAHORIToshihide IGARIYasuharu CHUMANTakumi TOKIYOSHIAlan CF COCKSThe Japan Society of Mechanical Engineersarticlecreepcreep damagecreep cavitycreep voidtype ivmodified 9cr-1mo steelwelded jointsdamage mechanicsMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 5, Pp 16-00697-16-00697 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	creep creep damage creep cavity creep void type iv modified 9cr-1mo steel welded joints damage mechanics Mechanical engineering and machinery TJ1-1570
spellingShingle	creep creep damage creep cavity creep void type iv modified 9cr-1mo steel welded joints damage mechanics Mechanical engineering and machinery TJ1-1570 Takashi HONDA Takuya FUKAHORI Toshihide IGARI Yasuharu CHUMAN Takumi TOKIYOSHI Alan CF COCKS Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel
description	From the standpoint of evaluating Type IV creep damage in the fine-grained heat affected zones (FGHAZ) of welded joints, an analysis method combining continuum damage mechanics (CDM) and a cavity nucleation model is proposed and applied to the creep testing of simulated-FGHAZ notched bars of mod. 9Cr-1Mo steel at 650°C. The Perrin-Hayhurst CDM model is adopted, which considers both softening by precipitate coarsening and damage by creep cavities. For the cavity nucleation model, a proposal by Gonzalez and Cocks is employed, which considers the randomness of grain-boundary-facet orientations in a polycrystalline material and gives a nucleation rate that is a function of the creep strain rate and a tri-axiality factor. The critical value of the damage parameter, corresponding to the initiation of micro cracks due to the coalescence of creep cavities, is expressed in terms of a critical value of the number density of creep cavities as determined from grain-boundary-resistance model simulations by the present authors. Creep rupture experiments have been conducted for circumferentially notched bar specimens with two kinds of notch acuities. The applicability of the combined CDM and cavity nucleation model is demonstrated by comparing the distribution of creep cavities observed experimentally with the simulation results. The final rupture life of the circumferentially notched bar specimens was also predicted to within a factor of two.
format	article
author	Takashi HONDA Takuya FUKAHORI Toshihide IGARI Yasuharu CHUMAN Takumi TOKIYOSHI Alan CF COCKS
author_facet	Takashi HONDA Takuya FUKAHORI Toshihide IGARI Yasuharu CHUMAN Takumi TOKIYOSHI Alan CF COCKS
author_sort	Takashi HONDA
title	Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel
title_short	Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel
title_full	Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel
title_fullStr	Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel
title_full_unstemmed	Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel
title_sort	creep damage analysis of simulated-haz notched bar specimens of modified 9cr-1mo steel
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/820072fda41e4d2fb7f81b88f24a1f22
work_keys_str_mv	AT takashihonda creepdamageanalysisofsimulatedhaznotchedbarspecimensofmodified9cr1mosteel AT takuyafukahori creepdamageanalysisofsimulatedhaznotchedbarspecimensofmodified9cr1mosteel AT toshihideigari creepdamageanalysisofsimulatedhaznotchedbarspecimensofmodified9cr1mosteel AT yasuharuchuman creepdamageanalysisofsimulatedhaznotchedbarspecimensofmodified9cr1mosteel AT takumitokiyoshi creepdamageanalysisofsimulatedhaznotchedbarspecimensofmodified9cr1mosteel AT alancfcocks creepdamageanalysisofsimulatedhaznotchedbarspecimensofmodified9cr1mosteel
_version_	1718409729103888384

Creep damage analysis of simulated-HAZ notched bar specimens of modified 9Cr-1Mo steel

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