Al粉末パック法を用いた炭素鋼上へのアルミニウムを含む炭化物膜の形成とそのメカニズム

抄録

The effect of C content in steels on the formation of an Al-containing carbide layer by an Al pack method at 980℃ was investigated. The continuous layer consisting of an outer β-FeAl and inner Fe₃AlC layers was formed on Fe-1.2C (in wt.%) by a short process time. An α-Fe(Al) layer with Fe₃AlC precipitates was formed below the β-FeAl layer on Fe-0.7C after 16 h of process, thereafter an Fe₃AlC layer was formed between the β-FeAl and α-Fe(Al) + Fe₃AlC layers after 25 h. The β-FeAl and α-Fe(Al)+ Fe₃AlC layers were formed on Fe-0.1C, but a continuous Fe₃AlC layer was not developed after longer treatment. A continuous Fe₃AlC layer formed by an Al pack method was explained by carbon enrichment at the α-Fe(Al)/γ-Fe(C) interface due to an inward growth of the α-Fe(Al) layer.