Abstract

Thermodynamic analysis of phase transformations of the multicomponent Fe–Ni–Cr–Cu–Si–C system is performed. It is of interest for the advanced metallothermic preparation technology of a wear-resistant alloy. To estimate the phase composition and structure of the alloy, computer calculations of characteristic vertical sections of the phase diagram are performed using the Thermo-Calc (TCW5 version) software; they are based on a digital simulation of phase equilibria using the CALPHAD method and the TTFe-Thermotech Fe-based Alloys Database, which includes data on chemical elements and is intended for the calculations of stable and metastable phases in multicomponent alloys. The phase transformations are considered at temperatures of 300 to 1400°C, a step of 100°C, and variable contents of Ni, Cr, Cu, Si, and C alloying elements. Vertical sections of the Fe–Ni–Cr–Cu–Si–C phase diagram are calculated, and the critical temperatures of the phase transformations of the alloy and chemical compositions of the formed phases (α, β, β₂, γ, γ₂, L) are determined. The thermodynamic simulation results show that, when an Fe-based alloy is alloyed, its microstructure becomes more complex and its phase composition changes; this situation takes place during gas-plasma facing. To study solidification to obtain quantitative information about the solidification stages of an alloy, the critical temperatures separating the stages, the composition and amount of precipitated phases, and the effect of temperature are determined. The temperature dependence of melt solidification exhibits a transition of nonequilibrium melt solidification to an equilibrium solidification stage at 950°C; this assumes a fine-grained structure of the coating. Thermodynamic analysis allows us to predict a ferrite–martensite structure of the coating with ledeburite inclusions during the preparation of a wear-resistant coating by metallothermic technology. The constructed vertical sections show that complete dissolution of all components in liquid occurs at ~1400°C.

中文翻译：

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Fe-Ni-Cr-Cu-Si-C 体系相变的热力学估计

摘要

对多组分 Fe-Ni-Cr-Cu-Si-C 系统的相变进行热力学分析。耐磨合金的先进金属热制备技术具有重要意义。为了估计合金的相组成和结构，使用 Thermo-Calc（TCW5 版本）软件对相图的特征垂直截面进行计算机计算；它们基于使用 CALPHAD 方法和 TTFe-Thermotech 铁基合金数据库的相平衡数字模拟，其中包括化学元素数据，用于计算多组分合金中的稳定和亚稳定相。相变是在 300 到 1400°C 的温度、100°C 的阶跃以及 Ni、Cr、Cu、Si 和 C 合金元素的可变含量下考虑的。₂ , γ, γ ₂ , L) 确定。热力学模拟结果表明，Fe基合金合金化后，其微观结构变得更加复杂，相组成发生变化；这种情况发生在面向气体等离子体的过程中。为了研究凝固以获得关于合金凝固阶段的定量信息，确定了分离阶段的临界温度、析出相的组成和数量以及温度的影响。熔融凝固的温度依赖性表现出非平衡熔融凝固在 950°C 时向平衡凝固阶段的转变；这假定涂层具有细粒结构。在通过金属热技术制备耐磨涂层期间，热力学分析使我们能够预测具有莱氏体夹杂物的涂层的铁素体-马氏体结构。构建的垂直截面显示所有组分在液体中的完全溶解发生在 ~1400°C。