Chromium-manganese iron alloy system design cast in metal and sand moulds for erosion resistance: a positron lifetime study

Sampathkumaran, P and Ranganathaiah, C and Seetharamu, S and Kishore, * (2011) Chromium-manganese iron alloy system design cast in metal and sand moulds for erosion resistance: a positron lifetime study. In: International Journal of Advanced Manufacturing Technology, 52 (1-4). pp. 45-52.

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Abstract

Erosion characteristics of high chromium (Cr, 16-19%) alloy cast iron with 5% and 10% manganese (Mn) prepared in metal and sand moulds through induction melting are investigated using jet erosion test setup in both as-cast and heat-treated conditions. The samples were characterised for hardness and microstructural properties. A new and novel non-destructive evaluation technique namely positron lifetime spectroscopy has also been used for the first time to characterise the microstructure of the material in terms of defects and their concentration. We found that the hardness decreases irrespective of the sample condition when the mould type is changed from metal to sand, On the other hand, the erosion volume loss shows an increasing trend. Since the macroscopic properties have a bearing on the microstructure, good credence is obtained from the microstructural features as seen from light and scanning electron micrographs. Faster cooling in the metal mould yielded fine carbide precipitation on the surface. The defect size and their concentration derived from positron method are higher for sand mould compared to metal mould. Lower erosion loss corresponds to smaller size defects in metal mould are the results of quicker heat transfer in the metal mould compared to the sand mould. Heat treatment effects are clearly seen as the reduced concentration of defects and spherodisation of carbides points to this. The erosion loss with respect to the defects size and concentration correlate very well.

Item Type:	Journal Article
Publication:	International Journal of Advanced Manufacturing Technology
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Chromium manganese ferrous alloy; Hardness; Erosion volume loss; As-cast; Heat treatment; Defects; Positron lifetime spectroscopy
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	01 Mar 2011 10:46
Last Modified:	01 Mar 2011 10:46
URI:	http://eprints.iisc.ac.in/id/eprint/35814

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