Phase Transformations in Low-Activation Chromium-Manganese Austenitic Steel under Long-Term Aging

IF 0.5 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING

Metal Science and Heat Treatment Pub Date : 2025-07-31 DOI:10.1007/s11041-025-01133-6

I. Yu. Litovchenko, S. A. Akkuzin, N. A. Polekhina, K. V. Spiridonova, V. V. Osipova

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Abstract

X-ray diffractometry and scanning and transmission electron microscopy are used to investigate structural and phase transformations in low-activation chromium-manganese austenitic steel under long-term (500 h) aging at 700°C in quenched and cold-rolled conditions and its mechanical properties are determined. Particles of M₂₃C₆ precipitate after aging over the boundaries of grains and microtwins as well as inside grains on components of microstructural defects and fine particles of MC carbides. The aging lowers the strength properties of the steel. The post-aging structure of the quenched steel contains particles of a FeCrMn σ-phase, which reduces the elongation to 7% in tensile tests at room temperature to 7%. Brittle fracture components associated with the σ-phase appear on the fracture surfaces and are partially preserved at elevated test temperatures (600 – 700°C). The possibilities of adjusting the chemical composition and the treatment modes of novel low-activation austenitic steels aimed at prevention of formation of σ-phase under long-term aging in the operating temperature range (650 – 700°C) are discussed.

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低活化铬锰奥氏体钢在长期时效下的相变

采用x射线衍射、扫描电镜和透射电镜研究了低活化铬锰奥氏体钢在700℃淬火和冷轧条件下长期（500 h）时效的组织和相变，并测定了其力学性能。时效后，M23C6颗粒在晶界、微孪晶界以及晶粒内部析出，析出部位为组织缺陷和MC碳化物的细颗粒。时效降低了钢的强度性能。淬火钢的后时效组织中含有FeCrMn σ相颗粒，室温拉伸试验伸长率降至7% ~ 7%。在较高的试验温度下（600 ~ 700℃），断口表面出现了与σ相相关的脆性断裂成分，并有部分保存。讨论了在650 ~ 700℃长期时效条件下，为防止形成σ相而调整新型低活化奥氏体钢的化学成分和处理方式的可能性。

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来源期刊

Metal Science and Heat Treatment 工程技术-冶金工程

CiteScore

1.20

自引率

16.70%

发文量

102

审稿时长

4-8 weeks

期刊介绍： Metal Science and Heat Treatment presents new fundamental and practical research in physical metallurgy, heat treatment equipment, and surface engineering. Topics covered include: New structural, high temperature, tool and precision steels; Cold-resistant, corrosion-resistant and radiation-resistant steels; Steels with rapid decline of induced properties; Alloys with shape memory effect; Bulk-amorphyzable metal alloys; Microcrystalline alloys; Nano materials and foam materials for medical use.