Austempering of low manganese ductile irons Part 3 Variation of mechanical properties with heat treatment conditions

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Abstract
Measurements of 0·2% proof stress, ultimate tensile strength, elongation, and impact energy are presented for low Mn, Cu iron and low Mn, Ni–Cu iron as a function of austempering time, austempering temperature, and austenitising temperature. The mechanical properties show optimum values at times corresponding to the processing window derived from kinetic measurements. Austempering temperature is shown to influence the properties significantly and by varying the austempering temperature most of the grades of the standard ASTM A897M: 1990 can be achieved with the irons studied. Austenitising temperature is shown to influence the elongation and impact energy significantly at higher austempering temperatures and it is possible by lowering the austenitising temperature to open the processing window at a particular austempering temperature and improve the mechanical properties. MST/1899

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