Heterogeneous Welded Joints (T23-T92; 15CH1M1F-P91)

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Heterogeneous Welded Joints (T23-T92; 15CH1M1F-P91)

Popis výsledku v původním jazyce

The use of new construction materials is increasingly on demand for the construction of new power plants, and for the modernization of existing plants that are at the end of their service lifespan. Steels such as type P/T92 (modified martensitic 9-12 % Cr), and low-alloy steels derived from modified steel 2.5Cr1Mo (ASTM grade P/T23) are considered as promising alternatives. In the construction of power units, so-called heterogeneous joints, which most often are a combination of low-alloyed and high-alloyed materials, preferably need to be avoided. These welded joints are often weak links in the overall construction. Knowledge of the behaviour of creep-resistant steel welded joints is very important for the subsequent evaluation of the lifespan of the units. This study deals with the degradation of heterogeneous welded joints of steel T23 - T92 and 15CH1M1F - P91, using commercially available welding materials Thermanit MTS 616 (high-alloyed), Union I P23; Thermanit P23, Böhler P23-IG and Thermanit (FOX) P23 (low-alloyed). In the heterogeneous welds examined, a slight loss of strength of the base material was observed during isothermal heat exposure and an extension of the diffusion active zones (i.e., Carbon Depleted Zone (CDZ) and Carbon Enriched Zone (CEZ)). These degradation processes caused the structural instability of heterogeneous welds. It was found that the use of low-alloyed welding materials showed superior structural stability to that of high-alloyed welds. Additional laboratory analyses are warranted due to the severe service conditions and high temperature loads in power units.

Název v anglickém jazyce

Heterogeneous Welded Joints (T23-T92; 15CH1M1F-P91)

Popis výsledku anglicky

The use of new construction materials is increasingly on demand for the construction of new power plants, and for the modernization of existing plants that are at the end of their service lifespan. Steels such as type P/T92 (modified martensitic 9-12 % Cr), and low-alloy steels derived from modified steel 2.5Cr1Mo (ASTM grade P/T23) are considered as promising alternatives. In the construction of power units, so-called heterogeneous joints, which most often are a combination of low-alloyed and high-alloyed materials, preferably need to be avoided. These welded joints are often weak links in the overall construction. Knowledge of the behaviour of creep-resistant steel welded joints is very important for the subsequent evaluation of the lifespan of the units. This study deals with the degradation of heterogeneous welded joints of steel T23 - T92 and 15CH1M1F - P91, using commercially available welding materials Thermanit MTS 616 (high-alloyed), Union I P23; Thermanit P23, Böhler P23-IG and Thermanit (FOX) P23 (low-alloyed). In the heterogeneous welds examined, a slight loss of strength of the base material was observed during isothermal heat exposure and an extension of the diffusion active zones (i.e., Carbon Depleted Zone (CDZ) and Carbon Enriched Zone (CEZ)). These degradation processes caused the structural instability of heterogeneous welds. It was found that the use of low-alloyed welding materials showed superior structural stability to that of high-alloyed welds. Additional laboratory analyses are warranted due to the severe service conditions and high temperature loads in power units.

Druh

C - Kapitola v odborné knize

CEP obor

JG - Hutnictví, kovové materiály

OECD FORD obor

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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

2015

Kód důvěrnosti údajů

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

Název knihy nebo sborníku

From Functionalized Nanostructures Towards Engineered Macrostructures

ISBN

978-80-88113-20-1

Počet stran výsledku

11

Strana od-do

108-118

Počet stran knihy

183

Název nakladatele

Epika

Místo vydání

Jindřichův Hradec

Kód UT WoS kapitoly

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