Microstructral characteristics of electrical discharge alloying silicon modified layer on spheroidal graphite cast iron

Hung Mao Lin, Truan-Sheng Lui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, electrical discharge alloying process is used to modify the surface of ferritic spheroidal graphite (SG) cast iron. The surface modification of SG cast iron with electrical discharge alloying is used to examine the effect of discharge current on the thickness, hardness and surface roughness of the surface modified layer while the pulse duration, duty factor, electrode polarity (negative electrode) and the electrode composition (Fe-75mass%Si) are fixed. Experiment results reveal that the thickness of the surface modified layer tends to increase as the discharge current increases. In addition, the microstructure of the layer consists of fine dendritic crystals and tiny graphite particles. The results of EPMA compositional analysis indicate that the silicon element was contained in the electrode effectively dissolved in the alloying layer of SG cast iron and the content of the dissolved electrode elements decreases gradually from the discharge surface to substrate bulk. The Si concentrations and micro-hardness of the alloying layer also increase with the discharge current. The results of X-ray diffraction on the Si alloying layer show that α phase, ε phase and metastable phase of FeSiC are the main compositional phases.

Original languageEnglish
Title of host publicationProceedings of the 17th IFHTSE Congress
PublisherThe Japan Society for Heat Treatment (JSHT)
Pages331-334
Number of pages4
ISBN (Electronic)9780000000002
Publication statusPublished - 2009 Jan 1
Event17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, Japan
Duration: 2008 Oct 262008 Oct 28

Publication series

NameProceedings of the 17th IFHTSE Congress
Volume1

Other

Other17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
CountryJapan
CityKobe
Period08-10-2608-10-28

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Mechanics of Materials

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  • Cite this

    Lin, H. M., & Lui, T-S. (2009). Microstructral characteristics of electrical discharge alloying silicon modified layer on spheroidal graphite cast iron. In Proceedings of the 17th IFHTSE Congress (pp. 331-334). (Proceedings of the 17th IFHTSE Congress; Vol. 1). The Japan Society for Heat Treatment (JSHT).