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  • 1. El-Bealy, Mostafa Omar
    Modelling of heat flow and interdendritic crack formation in twin-roll strip casting of aluminium alloys2016In: Canadian metallurgical quarterly, ISSN 0008-4433, E-ISSN 1879-1395, Vol. 55, no 1, p. 23-44Article in journal (Refereed)
    Abstract [en]

    Preliminary mathematical analyses of different interdendritic cracks associated with variation of heat transfer and generation of interdendritic strain in horizontal twin-roll strip casting have been investigated. A 1-D transient finite difference model of heat flow, dendritic solidification and interdendritic thermo-metallurgical strain has been developed. The model contains two cracking criteria to predict qualitatively and quantitatively the tendency of interdendritic crack formation during dendritic solidification of pure aluminium and 6022 aluminium alloy. The model predictions are compared to available analytical methods and previous measurements. This is to verify and calibrate the model where good and reasonable agreements are obtained, respectively. The variations of heat transfer modes during different contact cooling zones and their effects on the generation of interdendritic thermo-metallurgical strain at the surface and central strip locations have been analysed. The model predictions point out that the different contact cooling zones of strip surface and surroundings control the stages of interdendritic crack formation in different mushy regions. The mechanism of interdendritic crack formation in twin-roll strip casting process with previous and present cracking criteria have been explained and discussed. These discussions show the importance of selection of mathematical treatment to predict the stages of interdendritic crack formation. 

  • 2. Sahajwalla, V.
    et al.
    Khanna, R.
    Kapilashrami, E.
    Seetharaman, Seshadri
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
    Depletion of carbon from Al2O3-C mixtures into liquid iron: Rate controlling mechanisms2007In: Canadian metallurgical quarterly, ISSN 0008-4433, E-ISSN 1879-1395, Vol. 46, no 1, p. 25-32Article in journal (Refereed)
    Abstract [en]

    A sessile drop investigation on the kinetics of carbon dissolution from an alumina-carbon composite (75% C, 25% alumina) and a commercial refractory (28.3% C, 66.67% alumina, 5% binder) into liquid iron at 1600 degrees C is reported. Carbon dissolution from refractory substrates was very slow reaching 0.84% C and 0.1% C, respectively after 60 minutes. Both substrates also showed poor wettability. Experimental studies were supplemented with atomistic Monte Carlo simulations to investigate the influence of composition, temperature and melt turbulence. High carbon systems (100% C and 75% C, balance alumina) were affected by both temperature and melt turbulence to some extent; increased levels of melt turbulence/higher temperatures had no influence on low carbon (30% C) system. While mass transfer was the dominant rate controlling mechanism for high carbon systems, poor wettability of alumina with liquid iron and its significant influence on inhibiting the penetration of liquid iron in the refractory matrix was found to be the dominant rate controlling factor for low carbon refractories.

  • 3.
    Sandström, Rolf
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Korzhavyi, Pavel
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.
    Use of elastic constants based on ab initio computation in materials optimisation of austenitic stainless steels2014In: Canadian metallurgical quarterly, ISSN 0008-4433, E-ISSN 1879-1395, Vol. 53, no 3, p. 282-291Article in journal (Refereed)
    Abstract [en]

    The use of ab initio quantum mechanics methods to compute elastic constants of austenitic stainless steels is reviewed. It is demonstrated that the elastic constants can be predicted accurately as a function of composition. This enables the use of materials optimisation techniques to develop new materials that are systematically adapted to specific components. After the design criteria and the target function to be optimised have been formulated, the optimum property combination can be searched for. The properties involved constitute a property space, where domains with active design criteria are identified. In the present paper, the domain where the stiffness is the controlling property is considered. Cost, weight and environmental impact minimisation is analysed. It turns out that for all three target functions, austenitic stainless steels with low chromium and nickel contents are preferred materials.

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