Microstructure and Stability of Fe-Cr-C Hardfacing Alloys"

S. Atamert and H. K. D. H. Bhadeshia


The microstructure and high temperature stability of an iron-base hardfacing alloy of nominal composition Fe-30Cr-3.8C wt.% deposited by manual metal arc welding has been investigated using microscopy, microanalysis, dilatometry and thermodynamic modelling. In the as-deposited condition the undiluted alloy was confirmed to consist of a mixture of M7C3 carbide and metastable austenite containing a high chromium concentration. Since the properties of the alloy depend on the stability of the austenite, annealing experiments were carried out to investigate the decomposition of the austenite into a mixture of ferrite and carbides. The results demonstrate that at temperatures around 750oC the austenite starts to decompose rapidly, beginning with the precipitation of M23C6 carbides, although the final equilibrium phase mixture is simply Cr-depleted ferrite and M7C3. The implications of these results are discussed with respect to the potential applications of the alloy.

Materials Science and Engineering, Vol. A130, 1990, pp. 101-112.

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