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成分为0.07%C,4.6%Al,32.5%Mn,3.1%Mo的Fe-Al-Mn-Mo合金,于1100℃固溶处理后,具有γ+δ复相组织。用金相法研究了δ铁素体于950—450℃温度范围的组织转变过程,并对转变产物进行了结构与成分的相分析。以金相法测定了等温转变的开始动力学曲线,测量了等温转变过程中δ铁素体内显微硬度的变化。研究表明:于950—750℃有δ→γ转变,650—550℃有δ→γ+M_(23)C_6转变。此二转变分别以完全扩散型及贝茵体型方式在相应的温度范围内同时进行。750—450℃有α-Mn型晶体结构的金属化合物X相宜δ铁素体中脱溶。X相平均化学式为Fe_(26)Mn_(16)Mo_8Al_8。
The composition of Fe-Al-Mn-Mo alloy with 0.07% C, 4.6% Al, 32.5% Mn and 3.1% Mo possesses γ + δ complex microstructure after solution treatment at 1100 ℃. The microstructure of δ ferrite in the temperature range of 950-450 ℃ was studied by metallographic method. The structure and composition of the transformation products were analyzed. The onset kinetic curve of isothermal transformation was measured by metallographic method and the variation of microhardness of δ ferrite during isothermal transformation was measured. The results show that there are δ → γ transitions at 950-750 ℃ and δ → γ + M 23 C 6 transitions at 650-550 ℃. The two transitions were fully diffused and bain type respectively in the corresponding temperature range. 750-450 ° C α-Mn-type crystal structure of the metal compound X-phase δ ferrite desolventizing. X-phase average formula is Fe_ (26) Mn_ (16) Mo_8Al_8.