The densification mechanism of squeeze casting

TL;DR

This paper analyzes the solidification process in squeeze casting, establishing a relationship between punch velocity and solidification rate, and discusses how plastic deformation influences defect-free casting through densification mechanisms.

Contribution

It introduces a theoretical model linking punch velocity to solidification rate and explains how plastic deformation promotes defect-free castings by enabling simultaneous nucleation.

Findings

Linear relationship between punch velocity and solidification rate

Punch velocity must exceed solidification rate for defect-free castings

Plastic deformation facilitates simultaneous nucleation by reducing temperature gradients

Abstract

The solidification process during squeeze casting is analyzed based on the classical solidification and plastic deformation theory. The linear relationship between punch velocity and the solidification rate is established if the density change of molten meals is neglected. To obtain defect-free castings, the punch velocity should be larger than the solidification rate. The densification mechanism is also discussed. The plastic deformation will result in the radical movement of the central molten metals, which reduces the temperature gradient from the center to the mold wall, which provides the condition to obtain defect-free castings: simultaneous nucleation.