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

Hung Mao Lin, Truan-Sheng Lui

研究成果: Conference contribution

摘要

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.

原文English
主出版物標題Proceedings of the 17th IFHTSE Congress
發行者The Japan Society for Heat Treatment (JSHT)
頁面331-334
頁數4
ISBN(電子)9780000000002
出版狀態Published - 2009 一月 1
事件17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, Japan
持續時間: 2008 十月 262008 十月 28

出版系列

名字Proceedings of the 17th IFHTSE Congress
1

Other

Other17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
國家/地區Japan
城市Kobe
期間08-10-2608-10-28

All Science Journal Classification (ASJC) codes

  • 表面、塗料和薄膜
  • 凝聚態物理學
  • 材料力學

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