鐵–30錳–6鋁–3鉻–0. 9碳合金之高溫氮化現象

The Phenomenon of Nitridation of Fe-30Mn-6Al-3Cr-0.9C Alloy at High-Temperature

以Fe-30.1Mn-5.7Al-2.9Cr-0.9C合金，於950～1050℃一大氣壓氮氣環境進行高溫氮化實驗。合金之氮化型式為氮之內擴散所致的氮侵蝕，依內侵蝕深度之量測顯示氮侵蝕反應依循拋物線率。藉由穿透式電子顯微鏡之EDX的半定量分析，發現在AIN之間的基材中央部位，氮含量較兩旁為多，顯示氮是以體擴散的方式進入合金基材，並與鋁反應形成AIN。

The nitrogen attack behavior of Fe-30.1Mn-5.7Al-2.9Cr-0.9C (in wt%) alloy was studied in the temperature ranged 950~1050℃ at 1 atm pure nitrogen atmosphere. Nitrogen attack caused by the inward diffusion of nitrogen is the typical style of nitriding. The nitriding kinetics followed parabolic rate law via the measurement of the depth of the internal attack. Because the nitrogen content in the middle region between the AlN needles was higher than the regions near AlN needles by the quasi-quantitative analysis of EDX in TEM, we could suggest that nitrogen diffused into the alloy matrix by volume diffusion and reacted with aluminum to form AlN.