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ISSN: 2637-4668

Trends in Civil Engineering and its Architecture

Research Article(ISSN: 2637-4668)

Application of Non-Destructive Testing and Signal Processing Characteristics to Identify Defects and Microstructural Changes in Advanced High Strength Steels

Volume 2 - Issue 4

Isaac Garcia C1* and Zhanfang Wu1,2,3

  • Author Information Open or Close
    • 1Mechanical Engineering and Materials Science Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA
      2 School of Materials Science and Engineering, Northeastern University, China
      3 National Engineering and Research Center of Continuous Casting Technology, Central Iron & Steel Research Institute, China

    *Corresponding author: Isaac Garcia C, Ferrous Physical Metallurgy Group, Mechanical Engineering and Materials Science Department, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA

Received: June 23, 2018;   Published: August 01, 2018

DOI: 10.32474/TCEIA.2018.03.000143

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Nondestructive testing (NDT) and signal processing were used to detect, locate and define surface and internal defects in unidirectionally solidified laboratory ingots. These defects included cracks, voids, coarse non-metallic inclusions and heavy chemical and microstructural segregation. Many NDT techniques have been developed and used to assess the presence of these defects. The factors responsible for these defects are often related to mechanical, thermal, or transformation stresses during the solidification process of continuously cast steels. The high thermal stresses result from the difference expansion or contraction behavior caused by the frequency of the temperature fluctuation during solidification. In order to study the effect of these temperature fluctuations to the defects, a specially designed copper chill mold that simulates the solidification rate of continuously cast slabs was designed. In addition, a NDT-UT system was applied to localize and describe the presence of defects caused by thermal or transformation stresses. Furthermore, the signal processing analysis was used to characterize the changes in microstructure and hardness. The results of those studies are presented and discussed.

Keywords: Defects; NDT; Microstructure; Thermal stresses; Internal crack

Abstract| Introduction| Experimental Procedure| Signal Processing Characteristics| Conclusion| Acknowledgement| References|