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。
Austenite and δ-ferrite coexist after a solution treatment at 1100℃ in an Fe-Al-Mn-Mo alloy with a composition of 0.07% C, 4.6% Al, 32.5% Mn and 3.1% Mo. The processes of phase transformation in the temperature range 950—450℃ were studied metallographically and the transformation products were electrolytically extracted and examined. The curves for the beginning of isothermal transformation were determined metallographically.It has been found that δ→γ transformation occurs at temperatures between 950—750℃ and δ→γ + M_(23)C_6 transformation between 650—550℃. They proceed by a fully diffusive process and a bainitic process simultaneously in the respective temperature ranges. An intermetallic compound X phase of α-Mn structure corresponding to Fe_(26)Mn_(16)Mo_8Al_8 was found to precipitate from δ-ferrite at temperatures between 750—450℃.
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