Masters Theses

Yanru Lu

Keywords and Phrases

Continuous cast steel; Hot tearing; Solidification; Strain; Stress; Thermal analysis

Abstract

”Hot tearing has long been recognized as a major problem that plagues the development of the continuous casting process and results in low-quality products. Understanding of the mechanisms and the required conditions for the hot tearing formation is important for industries but has not been well-established yet. Thus, this research focuses on the hot tearing issue observed in continuous cast steel, by providing a summary of the current research progress and then introducing a new laboratory method to determine the thermo-mechanical properties relevant to hot tearing of different steel grades under different solidification conditions. In this method, an apparatus was developed to apply a certain amount of the strain to the solidifying steel shell at a controlled strain rate. A special mold, equipped with two water-cooled copper chills and an insulation sleeve, was designed to control the dendrite growth in the direction perpendicular to the applied strain and to ensure that the strain was applied in the region of controlled shell growth. The temperature, displacement and force were monitored and recorded as a function of time by a computer system during the test.

The in-situ hot tensile test was performed for a medium carbon steel using this apparatus to determine the thermo-mechanical properties of the solidifying casting. Filling and solidification simulation software was used to predict the temperature profile during the experiment. It was found that the calculated temperature was in good agreement with the measured temperature in experiments. The fracture strength obtained with this method was comparable with that measured by the submerged-split chill tensile test, but was lower than that determined by the conventional hot tensile test”--Abstract, page iv.

Advisor(s)

Bartlett, Laura

Committee Member(s)

O'Malley, Ronald J.
Lekakh, S. N. (Semen Naumovich)

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Materials Science and Engineering

Comments

This project has been supported by the Peaslee Steel Manufacturing Research Center (PSMRC).

Research Center/Lab(s)

Peaslee Steel Manufacturing Research Center

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2020

Journal article titles appearing in thesis/dissertation

  • A review on hot tearing of steels
  • New experimental apparatus to investigate hot tearing behavior in steel
  • Developing a method to investigate mechanical behavior of steel near its solidus temperature

Pagination

xiv, 109 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2020 Yanru Lu, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11792

Electronic OCLC #

1240361927

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