Properties and microstructure of weldments made of new austenitic steels after creep exposure

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25870807%3A_____%2F17%3AN0000026" target="_blank" >RIV/25870807:_____/17:N0000026 - isvavai.cz</a>

Result on the web

<a href="https://www.metal2018.com/files/uploads/02/METAL2017_conference_proceedings_content.pdf" target="_blank" >https://www.metal2018.com/files/uploads/02/METAL2017_conference_proceedings_content.pdf</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Properties and microstructure of weldments made of new austenitic steels after creep exposure

Original language description

The newly developed grades of austenitic heat resistant steels (Super 304H, HR3C, TP 347 HFG) exhibit superior corrosion resistance in steam as well as creep strength thanks to their fine-grained microstructure, especially in case of Super 304H and TP 347 HFG. They are worldwide used in USC power plant boilers and substitute steels AISI 316, AISI 321 and/or AISI 347 formerly used in superheater and reheater tubes. On the other hand, the structural stability of these new steels is under examination, especially form the viewpoint of -phase precipitation, which is known for its embrittlement effect. The precipitation of -phase was already found in the mentioned steels after long-term annealing at working temperature in the base material of tubes as well as in the tube bends. However, it seems that the presence of applied stress (and/or deformation) significantly promotes the precipitation of this phase. Therefore, much more and coarser particles of -phase were detected in the weldments after creep exposure. The paper presents the results of stress rupture tests of welded tubes made of steels Super 304H and HR3C, the assessment and prediction of long-term creep life and describes also the structural changes that appeared in these steels, especially precipitation of -phase, when significant difference in the amount of -phase between the both steels was revealed.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

<a href="/en/project/LO1203" target="_blank" >LO1203: Regional Materials Science and Technology Centre - Feasibility Program</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Article name in the collection

METAL 2017 - 26th International Conference on Metalurgy and Materials

ISBN

978-80-87294-79-6

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

882-887

Publisher name

Tanger, Ltd., Keltičkova 62, 710 00 Ostrava. Czech Republic

Place of publication

Ostrava

Event location

Brno

Event date

May 24, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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