FACTORS INFLUENCING SPRAY QUENCHING OF STEEL PRODUCTS

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

FACTORS INFLUENCING SPRAY QUENCHING OF STEEL PRODUCTS

Popis výsledku v původním jazyce

Spray cooling is a common cooling method in the steel industry and especially in the heat treatment and quenching of steel products and components. The water is sprayed on the hot surface by the nozzle which transforms the water stream into droplets. Sprays can provide very high cooling rates with the benefit of the regulation of the cooling process. The proper cooling regime is crucial for obtaining required mechanical properties after quenching. The spray cooling of hot steel surfaces (presence of boiling) is influenced by several parameters. They can be divided into two groups. The first group deals with spray parameters like water impact density, water temperature, water additives and droplets size. The second group relates to cooled surface: temperature, velocity, roughness and presence of scales. The key factors are the water impact density and cooled surface temperature. Number of factors makes the numerical prediction of the cooling intensity (heat transfer coefficient) complicated and so the laboratory measurement which includes mentioned factors is a way how to obtain exact value of the heat trůansfer coefficient for spray cooling of hot surfaces. The exact knowledge of the temperature dependent heat transfer coefficient is crucial for numerical simulations of the cooling process which allows proper design (sizing) of spray quenching units. This paper describes non-stationary spray cooling laboratory measurement and deals with factors influencing the spray cooling. The influence of each factor is experimentally investigated and the influence on the heat transfer coefficient is described.

Název v anglickém jazyce

FACTORS INFLUENCING SPRAY QUENCHING OF STEEL PRODUCTS

Popis výsledku anglicky

Spray cooling is a common cooling method in the steel industry and especially in the heat treatment and quenching of steel products and components. The water is sprayed on the hot surface by the nozzle which transforms the water stream into droplets. Sprays can provide very high cooling rates with the benefit of the regulation of the cooling process. The proper cooling regime is crucial for obtaining required mechanical properties after quenching. The spray cooling of hot steel surfaces (presence of boiling) is influenced by several parameters. They can be divided into two groups. The first group deals with spray parameters like water impact density, water temperature, water additives and droplets size. The second group relates to cooled surface: temperature, velocity, roughness and presence of scales. The key factors are the water impact density and cooled surface temperature. Number of factors makes the numerical prediction of the cooling intensity (heat transfer coefficient) complicated and so the laboratory measurement which includes mentioned factors is a way how to obtain exact value of the heat trůansfer coefficient for spray cooling of hot surfaces. The exact knowledge of the temperature dependent heat transfer coefficient is crucial for numerical simulations of the cooling process which allows proper design (sizing) of spray quenching units. This paper describes non-stationary spray cooling laboratory measurement and deals with factors influencing the spray cooling. The influence of each factor is experimentally investigated and the influence on the heat transfer coefficient is described.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

ECHT 2019

ISBN

978-88-98990-19-1

ISSN

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e-ISSN

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Počet stran výsledku

9

Strana od-do

1-9

Název nakladatele

Associazione italiana di metalurgia

Místo vydání

Milano

Místo konání akce

Bardolino

Datum konání akce

5. 6. 2019

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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