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Effects of Heat Treatment on Hardness and Dry Wear Properties of a Semi-Solid Processed Fe-27 wt pct Cr-2.9 wt pct C Cast Iron

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Journal of Materials Science & Technology 2008年第3期24卷 330-334页

作者： A.Wiengmoon T.Chairuangsri n.Chomsang n.poolthong J.T.H.Pearce Department of Physics Faculty of ScienceNaresuan University Department of Industrial Chemistry and Electron Microscopy Research and Service Center Faculty of ScienceChiang Mai University Department of Physics Faculty of ScienceChiang Mai University Division of Materials Technology School of EnergyEnvironmental and MaterialsKing Mongkut's University of Technology Thonburi national Metal and Materials Technology Center

EfFects of heat treatments on hardness and dry wear properties of a semi-solid processed Fe-26.96 wt pct Cr- 2.91 wt pct C cast iron were studied. Heat treatments included tempering at 500℃, destabilisation at 1075℃ and destabilisation at 1075℃ plus tempering at 500℃, all followed by air cooling. Electron microscopy revealed that, in the as-cast condition, the primary proeutectic austenite was round in shape while the eutectic M7C3 carbide was found as radiating clusters mixed with directional clusters. Tempering did not change the microstructure significantly when observed by scanning or transmission electron microscopy. Destabilisation followed by air cooling led to a precipitation of secondary M23C6 carbide and a transformation of the primary austenite to martensite. Precipitation behaviour is comparable to that observed in the conventionally cast iron. Tempering after destabilisation resulted in a higher amount of secondary carbide precipitation within the tempered martensite in the eutectic structure. Vickers macrohardness and microhardness in the proeutectic zones were measured. Dry wear properties were tested by using a pin-on-disc method. The maximum hardness and the lowest dry wear rate were obtained from the destabilisation-plus-tempering heat treatment due to the precipitation of secondary carbides within the martensite matrix and a possible reduction in the retained austenite.

关键词： Semi-solid process High chromium cast iron Heat treatment Hardness Wear

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Use of electron microscopy on microstructure characterization of high chromium cast irons

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China Foundry 2007年第1期4卷 38-43页

作者： J.T.H. Pearce T. Chairuangsri A. Wiengmoon n. poolthong H. nomura MTEC-national Metals and Materials Technology Centre Department of Industrial Chemistry Chiang Mai University Department of Physics Naresuan University Division of Materials Technology King Mongkut's University of Technology Thonburi Department of Materials Nagoya University

The physical metallurgy underlying the development of cast microstructures in abrasion resistant high chromium cast irons, and their structural modification by thermal treatments is relatively complex. Structural characterisation via electron microscopy therefore has a key role to play in furthering our understanding of the phase transformations that control the microstructures and hence the service performances of these irons as wear parts. This paper shows how both scanning and especially transmission electron microscopy can provide valuable information on the nature of eutectic and secondary carbides and on the matrix structures in these irons. Particular attention is given to current characterisation research on conventionally cast 30%Cr irons that are used for applications involving corrosive wear e.g. slurry pumps and on a semi-solid cast 27%Cr iron that has a potential for applications in industry.

关键词： high chromium cast iron electron microscopy microstructure characterization

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