Honors College Theses

Date

2021

Major

Mechanical Engineering (B.S.)

Document Type and Release Option

Thesis (restricted to Georgia Southern)

Faculty Mentor

Dr. Mingzhi Xu

Abstract

Cast metals typically shrink when changing state from liquid to solid and during cooling. However, certain metals such as cast iron with high carbon contents expand during solidification. A novel method is proposed to be used in multiple heats to track the expansion and contraction of a spheroidal graphite cast iron (SGI) mold wall utilizing a highly accurate non-contact laser displacement sensor while also tracking the thermal history of the casting utilizing thermocouples. In the current study, a fixture was designed to hold the non-contact laser displacement sensor that will be used in the different heats. The future work will include analyzing a multitude of variables that affect mold wall movement: mold strength, pouring temperature, riser condition, metalhead pressure, carbon equivalent, nodularity, and inoculation. Each variable will be studied independently and displacement and thermal data will be collected and linked to mold wall movement related defects such as surface distortion and porosity.

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