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Titolo:
Numerical analysis of the competitive influence of Marangoni flow and evaporation on heat surface temperature and molten pool shape in laser surface remelting
Autore:
Lei, YP; Murakawa, H; Shi, YW; Li, XY;
Indirizzi:
Beijing Polytech Univ, Sch Mat Sci & Engn, Beijing 100022, Peoples R ChinaBeijing Polytech Univ Beijing Peoples R China 100022 22, Peoples R China Osaka Univ, Joining & Welding Res Inst, Ibaraki, Osaka 567, Japan Osaka Univ Ibaraki Osaka Japan 567 ng Res Inst, Ibaraki, Osaka 567, Japan
Titolo Testata:
COMPUTATIONAL MATERIALS SCIENCE
fascicolo: 3, volume: 21, anno: 2001,
pagine: 276 - 290
SICI:
0927-0256(200107)21:3<276:NAOTCI>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
TYPE-304 STAINLESS-STEEL; TUNGSTEN-ARC WELD; THERMOCAPILLARY FLOW; PHASE-CHANGE; SOLIDIFICATION; VAPORIZATION; METAL; GTA; SIMULATION; TRANSPORT;
Keywords:
laser surface remelting; Marangoni flow; temperature distribution; fluid flow; molten pool shape; vaporization; stainless steel;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Lei, YP Beijing Polytech Univ, Sch Mat Sci & Engn, 100 Ping Le Yuan, Beijing 100022, Peoples R China Beijing Polytech Univ 100 Ping Le Yuan Beijing Peoples R China 100022
Citazione:
Y.P. Lei et al., "Numerical analysis of the competitive influence of Marangoni flow and evaporation on heat surface temperature and molten pool shape in laser surface remelting", COMP MAT SC, 21(3), 2001, pp. 276-290

Abstract

A one-domain mixture continuum model is introduced to simulate numericallysolid/liquid phase transformation with a mushy region in laser surface remelting process of a type 304 stainless steel. Emphasis is given to the competitive influence of laser-induced alloying element vaporization and Marangoni flow on the heating surface maximum temperature and its distribution aswell as the molten pool shapes. The molten pool shapes and fluid flow, thetemperature distribution and its peak values on the heating surface have been computed for six calculation cases corresponding to six different pool-surface heat flux balances. The results show that the Langmuir-type vaporization heat loss due to Fe, Mn, Cr, Ni elements can significantly reduce theheating surface peak temperature and the pool profile, while /partial derivative sigma/partial derivativeT/ is small or the buoyancy force is considered as one and only driving force. However, when vaporization-type heat loss and Marangoni flow are coexisting, the free surface temperature distribution and its peak value are markedly affected by the magnitude order of surface tension gradient and the nature of the relationship between surface tension temperature coefficient and temperature. When /partial derivative sigma/partial derivativeT/ > 3.0 x 10(-4) N/m K, the influence of Langmuir-typevaporization heat loss is very small and can be ignored. (C) 2001 ElsevierScience B.V. All rights reserved.

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Documento generato il 30/03/20 alle ore 19:54:13