Abstract
The dissolution of graphite during sintering of PM steels prepared from iron and graphite powder mixes was studied using electrical conductivity measurement. The effect of graphite content and grade on the carbon transport rate and related mechanisms was investigated by sintering in the range 500 to 1200°C in different atmospheres, including hydrogen, nitrogen, and vacuum. The electrical conductivity measurement method was accompanied by quantitative metallography and microfractography techniques for determining the extent of carbon dissolution and its influence on the formation of sintered contacts. Weight loss measurement and the dilatometric method were also performed. The effect of manufacturing parameters on the mechanical properties of sintered parts was studied to find a correlation between mechanical behaviour, microstructure, and the conductivity/resistivity in order to develop a nondestructive testing method. The results show that changes in the material structure occurring during processing of sintered materials can be precisely detected via electrical conductivity measurement. The application of the method for iron–graphite powder compacts is shown.
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