A part produced from a low-alloy, 0.2% C steel has a microstructure containing ferrite, pearlite, bainite, and marten site after quenching. What microstructure would be obtained if we had used a 1080 steel? What microstructure would be obtained if we used a 4340 steel? [See Figure 13-14, 13-15, and 13-16(b).]