Ferrite transformation behavior of Fe-0.3 mass%N binary alloy was studied in the temperature range between 500°C and 750°C. By isothermal holding in the α + γ two phase region, two morphologies of Allotoriomorphic ferrite (AF) and Widmanstetten ferrite (WF) formed from the prior γ grain boundary. On the other hand, in the case of isothermal holding at 500°C, nitride-free bainitic ferrite (BF) was formed at the beginning, and changed to bainite accompanied with γ' precipitation in further holding. The retained γ was obtained by decreasing the transformation temperature in the two phase region, and maximum volume fraction of 9% was obtained at 600°C. AF had near K-S OR with one side of the adjacent prior γ and grew into the grain without K-S OR. On the other hand, WF and BF had near K-S relationship with the matrix. Both WF and BF had significantly higher energy dissipation than AF, and the energy dissipation of AF is due to interfacial friction. On the other hand, the strain energy associated with the transformation was dominant in WF.

研究了Fe-0.3质量％N二元合金在500°C至750°C温度范围内的铁素体转变行为。通过等温保持在α + γ两相区，从先验γ晶界形成了同素异形铁素体（AF）和Widmanstetten铁素体（WF）的两种形态。另一方面，在500℃下等温保持的情况下，首先形成无氮化物的贝氏体铁素体（BF），进一步保持时变为伴随γ '析出的贝氏体。通过降低两相区域的相变温度来获得残留的γ，并且在600℃下获得9％的最大体积分数。AF靠近KS或相邻先兆的一侧γ并发展成无KS或谷物。另一方面，WF和BF与矩阵具有接近KS关系。WF和BF的能量耗散均明显高于AF，而AF的耗能归因于界面摩擦。另一方面，与转变相关的应变能在WF中占主导地位。