| The effect of the intermetallic compound, AlN, on the mechanical property of low car bon steel was investigated. For this study, two different steels with different aluminum and nitrogen content were prepared. The one was Fe-0.1C-0.31Al-0.016N (steel A) which has excess aluminum compared with the stoichiometric ratio of one to one of Al and N, the other was Fe-0.1 C-0.04 Al-0.011 N (steel B) whose Al and N content was very close to one to one atomic ratio. Since the specimen whose Al and N content is close to one to one atomic ratio has greater common solid solubility of aluminum and nitrogen at the lower temperature compare to the steel with large deviation from one to one ratio, finer aluminum nitride precipitants are obtained through solution heat-treatment in steel B to inhibit grain growth during subsequent heating. The fine grain size and the precipitation hardening effect are believed to act for the enhancement of tensile strength and ductility of the low carbon steel. |
|
