Integrated Approach for Prediction of Hot Tearing

Shrinkage, imposed strain rate, and (lack of) feeding are considered the main factors that determine cavity formation or the formation of hot tears. A hot-tearing model is proposed that will combine a macroscopic description of the casting process and a microscopic model. The micromodel predicts whe...

Full description

Saved in:
Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2009-10, Vol.40 (10), p.2388-2400
Main Authors: Suyitno, Kool, W.H., Katgerman, L.
Format: Article
Language:English
Subjects:
Applied sciences
Casting
Characterization and Evaluation of Materials
Chemistry and Materials Science
Cracks
Exact sciences and technology
Fracture mechanics
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Nanotechnology
Plastic deformation
Solidification
Solids
Structural Materials
Surfaces and Interfaces
Thin Films
Validation studies
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Shrinkage, imposed strain rate, and (lack of) feeding are considered the main factors that determine cavity formation or the formation of hot tears. A hot-tearing model is proposed that will combine a macroscopic description of the casting process and a microscopic model. The micromodel predicts whether porosity will form or a hot tear will develop. Results for an Al-4.5 pct Cu alloy are presented as a function of the constant strain rate and cooling rate. Also, incorporation of the model in a finite element method (FEM) simulation of the direct-chill (DC) casting process is reported. The model shows features well known from literature such as increasing hot-tearing sensitivity with increasing deformation rate, cooling rate, and grain size. Similar trends are found for the porosity formation as well. The model also predicts a beneficial effect of applying a ramping procedure during the start-up phase, which is an improvement in comparison with earlier findings obtained with alternative models. In principle, the model does not contain adjustable parameters, but several parameters are not well known. A full quantitative validation not only requires detailed casting trials but also independent determination of some thermophysical parameters of the semisolid mush.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-009-9941-y