The Effect of Long-Term Ageing on Microstructural Properties and Laves Phase Precipitation of Welded P91 and P92 Steels

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60193247%3A_____%2F22%3AN0000009" target="_blank" >RIV/60193247:_____/22:N0000009 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21220/22:00350998

Výsledek na webu

<a href="https://onlinelibrary.wiley.com/doi/10.1002/srin.202100311" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/srin.202100311</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/srin.202100311" target="_blank" >10.1002/srin.202100311</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Effect of Long-Term Ageing on Microstructural Properties and Laves Phase Precipitation of Welded P91 and P92 Steels

Popis výsledku v původním jazyce

Creep resistant 9% Cr steels are frequently used in civil engineering projects of supercritical coal-fired power plants operating at temperatures of superheated steam around 610 °C. This work focus on analysis of microstructure degradation and degradation of mechanical properties of orbital narrow-gap welding of P91 and P92 steels. Nowadays welding technology of orbital narrow-gap using tungsten inert gas is not limited to welding of high-pressure steam pipelines. This method is highly productive and efficient and leads to an increase in productivity, quality, and repeatability of welding process. It replaces the original method of manual welding with coated electrode into a standard bevel, which is a time-consuming process that costs a high amount of weld metal. Welds are degraded at 650 °C/30 000 h without applied stress and the effect of degradation is evaluated across the weld based on the observed changes in microstructure and hardness. Attention is focused mainly on precipitation and coarsening of Laves phase in the main areas of heat affected zone (HAZ): coarse grain HAZ, fine grain HAZ, and intercritical HAZ. The results show that frequency and rate of Laves phase coarsening in the fine grain and coarse grain HAZ are higher than in the base material.

Název v anglickém jazyce

The Effect of Long-Term Ageing on Microstructural Properties and Laves Phase Precipitation of Welded P91 and P92 Steels

Popis výsledku anglicky

Creep resistant 9% Cr steels are frequently used in civil engineering projects of supercritical coal-fired power plants operating at temperatures of superheated steam around 610 °C. This work focus on analysis of microstructure degradation and degradation of mechanical properties of orbital narrow-gap welding of P91 and P92 steels. Nowadays welding technology of orbital narrow-gap using tungsten inert gas is not limited to welding of high-pressure steam pipelines. This method is highly productive and efficient and leads to an increase in productivity, quality, and repeatability of welding process. It replaces the original method of manual welding with coated electrode into a standard bevel, which is a time-consuming process that costs a high amount of weld metal. Welds are degraded at 650 °C/30 000 h without applied stress and the effect of degradation is evaluated across the weld based on the observed changes in microstructure and hardness. Attention is focused mainly on precipitation and coarsening of Laves phase in the main areas of heat affected zone (HAZ): coarse grain HAZ, fine grain HAZ, and intercritical HAZ. The results show that frequency and rate of Laves phase coarsening in the fine grain and coarse grain HAZ are higher than in the base material.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Steel Research International

ISSN

1611-3683

e-ISSN

1869-344X

Svazek periodika

93

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

13

Strana od-do

2100311

Kód UT WoS článku

000693899100001

EID výsledku v databázi Scopus

2-s2.0-85114109277