(a)
(b)
(c)
(d)
Figure 9. Failure occurs in a ductile fashion in the solution treated low silicon alloy (a) and high silicon alloy(b). Age hardening transitions the failure mode toward transgranular cleavage conforming to the dendrite structures for 1% silicon modified alloy (c) and 1.4% silicon modified alloy (d). The dendrite structure is also revealed by porosity in the 1% silicon alloy (c).
(a)
(b)
Figure 10. The low silicon Fe-Mn-Al-C alloy (a) shows work hardening in the solution treated and 10 hour 530°C aged condition at a strain rate of 3000 s-1
. Aged hardened material does not work harden as greatly as solution treated mate-
rial, but age hardened specimens had greater yield and tensile strength and slightly lower fracture strain. Rolled ho- mogeneous armor (b) does not strain harden to failure. Tensile strength occurs between 0.1 and 0.2 strain followed by decreasing stress to fracture beyond 0.6 strain.
International Journal of Metalcasting/Winter 10 13
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