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本文研究了成分为Mn 69.40％、Al 29.86％、C0.58％3元合金的相变动力学和3种不同成分Mn-Al-C合金的恒温转变过程,还用示差热分析法测定了合金在加热过程中相变的临界温度。实验结果表明:合金的恒温转变过程随成分不同而变化,处于亚共析成分时,τ相分解先析出γ相;处于过共析成分时,τ相分解先析出β-Mn相。τ相的稳定性取决于Mn/C比,含碳量一定,随Mn含量增加,τ相稳定性降低。必须使合金中的含碳量超过其在τ相内的溶解度极限,才能提高τ相的稳定性。
In this paper, the phase transformation kinetics of Mn 69.40%, Al 29.86% and C 0.58% ternary alloys were investigated, and the isothermal transformation process of three different Mn-Al-C alloys was also studied. The results of differential thermal analysis The critical temperature of phase change during heating. The experimental results show that the process of isothermal transformation changes with the composition of the alloy. In the case of the sub-eutectoid composition, the γ phase is precipitated first and the γ phase is precipitated first. When in the eutectoid composition, the β-Mn phase is precipitated first in the τ phase decomposition. The stability of τ phase depends on the Mn / C ratio, and the carbon content is constant. With the increase of Mn content, the stability of τ phase decreases. The carbon content in the alloy must exceed its solubility limit in the τ phase in order to improve the stability of the τ phase.