Figure 3. The age hardening curves for 1 and 1.4 % silicon containing Fe-Mn-Al-C alloys show a rapid increase in hardening through the first 6 hours. At times greater than six hours, hardness increases, but the hardening rate decreases. Maximum hardness is achieved after 30 hours for both alloys. The 1% silicon alloy hardens to 372 BHN, and the 1.4% alloy age hardens to 384 BHN.


(a)


(b)


(c)


(d)


Figure 4. The 1% silicon modified Fe-Mn-Al-C alloy contains less than 1% ferrite (by volume) in the solution treated condition (a) and 3% in the solution treated plus aged at 530°C for 60 hour condition (b). The 1.4% silicon containing alloy contained 6% in the solution treated condition (c) and 8% in the 60 hour aged condition (d).


10 International Journal of Metalcasting/Winter 10


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