High-Temperature Phases in the Fe–Mo–Cr–C System

IF 0.9 4区 材料科学 Q3 MATERIALS SCIENCE, CERAMICS
T. A. Velikanova, A. M. Zaslavskii, M. V. Kindrachuk
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Abstract

Phase equilibria involving the stable high-temperature quaternary χFe,Cr,Mo,C phase were established in the Fe–Mo–Cr–C phase diagram. The arc-melted alloys were annealed at subsolidus temperatures for 52 h and then quenched in liquid gallium. The solidus temperature of the alloys was determined with the Pirani–Alterthum method. High-temperature X-ray diffractometry was employed to monitor the sequence of changes in the alloy phase composition from room temperature to the solidus temperature. The χ + η + α, χ + η, and χ + σ phase equilibria were directly observed at 973 K < T < 1373 K, 1273 K < T < 1530 K, and 1523 K < T < 1530 K, respectively, in the Fe52.5Mo23.5Cr18.7C5.3 (at.%) alloy. The χ + M23C6 + α and χ + σ phase equilibria were directly observed at 973 K ≤ T < 1523 K and 1473 K < T < 1525 K in the Fe55.5Mo11.8Cr28.2C4.5 (at.%) alloy. It was shown that the two-phase χ + σ equilibrium could be preceded by three-phase χ + η + σ equilibria or a single-phase χ Fe,Cr,Mo,C equilibrium region (for the Fe52.5Mo23.5Cr18.7C5.3 alloy in the 1523 K < T < 1530 K temperature range). The quaternary χ Fe,Cr,Mo,C phase was found in the (51.9–64.9) Fe, (5.4–23.5) Mo, (14.5–35.4) Cr, and (1–10.7) C at.% composition ranges. Primary crystallization regions of the σ Fe,Cr,Mo,C and αFe,Cr,Mo,C phases with solidus temperatures of approximately 1530 K (for the Fe52.5Mo23.5Cr18.7C5.3 alloy) and 1525 K (for the Fe55.5Mo11.8Cr28.2C4.5 alloy) were revealed. The linear thermal expansion coefficients for the χ Fe,Cr,Mo,C, η Fe,Cr,Mo,C, and αFe,Cr,Mo,C phases of different composition observed for different temperature ranges were determined.

Abstract Image

Fe-Mo-Cr-C体系中的高温相
在Fe-Mo-Cr-C相图中建立了稳定高温季相fe、Cr、Mo、C的相平衡。将电弧熔化合金在亚固相温度下退火52 h,然后在液态镓中淬火。用皮拉尼-交替法测定了合金的固相温度。采用高温x射线衍射法监测合金相组成从室温到固相温度的变化顺序。在973 K <直接观察到χ + η + α、χ + η和χ + σ相平衡;T & lt;1373 K, 1273 K <T & lt;1530k和1523k <T & lt;在Fe52.5Mo23.5Cr18.7C5.3 (at.%)合金中分别加入1530k。在973 K≤T <时直接观察到χ + M23C6 + α和χ + σ相平衡;1523k和1473k <T & lt;1525k在Fe55.5Mo11.8Cr28.2C4.5 (at.%)合金中。结果表明:在1523 K <中,Fe52.5Mo23.5Cr18.7C5.3合金的两相χ + σ平衡区可先于三相χ + η + σ平衡区或单相χ Fe,Cr,Mo,C平衡区;T & lt;温度范围1530k)。在(51.9 ~ 64.9)Fe、(5.4 ~ 23.5)Mo、(14.5 ~ 35.4)Cr和(1 ~ 10.7)C合金中发现了季元χ Fe、Cr、Mo、C相。%组成范围。初生结晶区为σ Fe、Cr、Mo、C相和αFe、Cr、Mo、C相,固相温度分别为1530 K (Fe52.5Mo23.5Cr18.7C5.3合金)和1525 K (Fe55.5Mo11.8Cr28.2C4.5合金)。测定了不同组成的χ Fe、Cr、Mo、C相、η Fe、Cr、Mo、C相和αFe、Cr、Mo、C相在不同温度范围内的线性热膨胀系数。
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来源期刊
Powder Metallurgy and Metal Ceramics
Powder Metallurgy and Metal Ceramics 工程技术-材料科学:硅酸盐
CiteScore
1.90
自引率
20.00%
发文量
43
审稿时长
6-12 weeks
期刊介绍: Powder Metallurgy and Metal Ceramics covers topics of the theory, manufacturing technology, and properties of powder; technology of forming processes; the technology of sintering, heat treatment, and thermo-chemical treatment; properties of sintered materials; and testing methods.
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