| About this Abstract |
| Meeting |
Liquid Metal Processing & Casting Conference (LMPC 2022)
|
| Symposium
|
Liquid Metal Processing & Casting Conference (LMPC 2022)
|
| Presentation Title |
Comments on the Columnar/Equiax Transition in Remelted Ingots |
| Author(s) |
Alec Mitchell |
| On-Site Speaker (Planned) |
Alec Mitchell |
| Abstract Scope |
The columnar/equiax transition (CET) during solidification is often observable in ingots remelted by ESR or VAR. It is associated with enhanced segregation, porosity and larger non-metallic inclusion sizes. It is therefore advisable that the process melting parameters avoid the effect. These actions influence the process cost hence requiring definition of the CET onset. We outline the causes of the CET in alloys commonly remelted: also relate it to the solidification rate and temperature gradient. Most present melting operations cause the ingot central regions to solidify under conditions close to the CET onset driven either by dendrite fragmentation or the presence of nucleating particles depending on the alloy composition. It is suggested that melting conditions can be optimised by using the CET onset information together with suitable process models. |
| Proceedings Inclusion? |
Definite: At-meeting proceedings |