Abstract
The amount of solutal present in an alloy affects the grain size of the cast metal as solute is rejected at the solidification front. This is normally quantified using the so called growth restriction factor Q. This work presents some considerations about the effect of solutal on the final cast structure with a focus on the nature of the alloy system, the effect of non-equilibrium solidification conditions and the effect of superheating of the molten metal.
Highlights
The achievement of fine equiaxed grains is desirable in metals casting, independently of wrought or shape-casting alloys
The purpose of the work is to make some considerations about the effect of solutal content on the grain size of cast structure taking into account three aspects: (i) the nature of the alloy, (ii) the effect of non-equilibrium solidification conditions and (iii) the amount of superheating
One of the critical parameter influencing the final grain size is the total amount of solutal present in the alloy as it is accepted that solute is rejected by the growing grains upon solidification
Summary
The achievement of fine equiaxed grains is desirable in metals casting, independently of wrought or shape-casting alloys. A number of explanations have been proposed such as change in crystal growth morphology [11] and Si poisoning [13] there is still debate about the real nature of this coarsening in non-refined Al-Si alloys It has been demonstrated via thermodynamic simulations that if Ti is present in excess to the amount needed to form nucleating TiB2 particles, the growth rate of Al dendrites in Al-Si alloys increases leading to grain coarsening [8,9]. The purpose of the work is to make some considerations about the effect of solutal content on the grain size of cast structure taking into account three aspects: (i) the nature of the alloy, (ii) the effect of non-equilibrium solidification conditions and (iii) the amount of superheating
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
