Microstructure of CB2 Steel before and after Long-term Creep Tests

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F14%3A%230000552" target="_blank" >RIV/47718684:_____/14:#0000552 - isvavai.cz</a>

Result on the web

<a href="http://www.scientific.ne" target="_blank" >http://www.scientific.ne</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/MSF.782.179" target="_blank" >10.4028/www.scientific.net/MSF.782.179</a>

Result language

angličtina

Original language name

Microstructure of CB2 Steel before and after Long-term Creep Tests

Original language description

A pilot 4t valve made of CB2 steel was produced in the frame of COST Action 522. Specimens for long-term creep tests were taken from positions with a wall thickness of 130 mm and 85 mm. Creep testing was carried out at 650°C and a stress range from 50 MPa to 120 MPa. The longest times to rupture of specimens in individual positions were 67,857 h and 82,649 h respectively. Ruptured samples underwent fractographic and microstructural analyses. Quantitative evaluation of substructure was performed using SEM and TEM. Microstructure consisted of tempered martensite with primary boron and niobium nitrides and secondary particles of M23C6 carbide, Laves phase and vanadium nitride. During creep tests coarsening of Laves phase occurred and new particles nucleated on the site of M23C6 carbides, NbN or BN nitrides. Significant increase in volume fraction of Laves phase was detected in specimens ruptured up to 20,000 hours in comparison to as received conditions; any further increase was found out

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

JG - Metallurgy, metal materials

OECD FORD branch

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Project

<a href="/en/project/FR-TI4%2F509" target="_blank" >FR-TI4/509: Development of New Technology of Repair Welding for Operated Reactor Pressure Vessel WWER 1000</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2014

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Materials Science Forum

ISSN

1662-9752

e-ISSN

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Volume of the periodical

782

Issue of the periodical within the volume

31.3.2014

Country of publishing house

CH - SWITZERLAND

Number of pages

8

Pages from-to

311-318

UT code for WoS article

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EID of the result in the Scopus database

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