Magnetic Non-Destructive Evaluation of a Ductile Cast Iron with a Retained Proeutectoid Cementite

Alexandr Stupakov, Takanori Matsumoto, Tetsuya Uchimoto, Gábor Vértesy, Toshiyuki Takagi

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

This work studies the potential of magnetic hysteresis and Barkhausen noise measurements for detection of an inimical cementite/chill fraction in a ductile cast iron. The samples are cast into a specially shaped mold with four steps of different thickness to vary a cooling rate during the solidification. Six castings are performed with different chill acceleration components: 0.1, 0.2 and 0.3% of Cr; 0.7, 1.2 and 1.7% of Mn. This results in a wide variation of the cast iron composition, which is evaluated by a standard optical microscopy procedure and Vickers hardness techniques. Magnetic measurements are performed using a unique laboratory system with a direct determination of the surface tangential magnetic field. The presented results suggest that the magnetic response is mainly determined by the ferrite content. Increase of the ferrite content expectedly leads to a linear decrease of the magnetic coercive field. The magnetically/mechanically harder cementite increases the coercive field, but the complex cast iron structure with differently mixed fractions of ferrite and pearlite disturbs the linear correlation.

Original languageEnglish
Title of host publicationElectromagnetic Nondestructive Evaluation (XX)
EditorsArtur Lopes Ribeiro, Artur Lopes Ribeiro, Helena Geirinhas Ramos, Helena Geirinhas Ramos
PublisherIOS Press
Pages173-181
Number of pages9
ISBN (Electronic)9781614997665
DOIs
Publication statusPublished - 2017

Publication series

NameStudies in Applied Electromagnetics and Mechanics
Volume42
ISSN (Print)1383-7281
ISSN (Electronic)1879-8322

Keywords

  • Barkhausen noise
  • cast iron
  • cementite inclusion
  • coercive field

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering

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