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摘要
Solidification behavior and solid-state transformation were investigated in Fe-Mn-Al-C lightweight steel. The solidification mode of the Fe-9.3Mn-5.6Al-0.2C (wt.%) lightweight steel was predicted to be the F mode (liquid -> liquid + delta-ferrite -> delta-ferrite -> delta-ferrite + gamma-austenite), according to the classification of the solidification modes of stainless steels. However, the microstructures of an ingot of the lightweight steel showed that the solidification occurred by the FA mode (liquid -> liquid + delta-ferrite -> liquid + delta-ferrite + gamma-austenite -> delta-ferrite + gamma-austenite). To examine the difference between predicted and actual solidification modes, some specimens were annealed at various temperatures ranging from 1200A degrees C to 1450A degrees C for 10 min and then quenched. The microstructures of the annealed specimens exhibited that there were the narrow ranges of single delta-ferrite and solidification sections. This result indicates that the solidification mode of the present steel was the F mode, matching well with the predicted solidification mode. The reason for the FA mode, which was observed in the ingot, was because the liquid passed by a narrow solidification section and a single delta-ferrite region, and it directly entered the dual-phase region of delta-ferrite and gamma-austenite during cooling.
- 出版日期2014-9
