The Role of Deformation Conditions and Mo-Doping on the Evolution of Structure and Mechanical Properties of Powdered Iron Aluminide

IF 2.1 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
JOM Pub Date : 2025-02-24 DOI:10.1007/s11837-025-07249-7
O. I. Tolochyn, O. V. Tolochyna, Yu M. Podrezov, V. I. Danylenko, G. A. Bagliuk
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Abstract

High-temperature strengthening of iron aluminides is achieved through forging powder technology, utilizing a combination of several structural factors. Milling the initial powder accelerates phase formation during the early stages of heating, contributing to an anisotropic fine-grained microstructure that retains the shape and size of the milled powder particles. Molybdenum micro-additives inhibit diffusion processes during high-temperature deformation, while segregation along boundaries and the distribution of ultra-fine complex oxide particles, formed in situ during mechanical activation and thermomechanical processing, enhance the dispersed strengthening mechanism. Optimizing the thermomechanical processing regimes further strengthens these structural factors. After forging at 1100°C, molybdenum-doped alloys exhibit higher low-temperature strength but show reduced fracture toughness and a tendency to delaminate. Subsequent annealing at 1300°C corrects these defects, though increasing the grain size and second-phase particles. The optimal structure and mechanical properties are achieved by triple forging at 1200°C, under conditions near dynamic recrystallization, and demonstrate a high room-temperature strength of 1600–1900 MPa. Molybdenum-doped alloys show an ultimate strength of 300–330 MPa when stretched at 700°C. The creep rate at 750°C decreases to 8.4 × 10−7 s−1 for the 2% Mo alloy and 3.7 × 10−7 s−1 for the 5% Mo alloy, comparable to modern austenitic steels.

铁铝化物的高温强化是通过锻造粉末技术实现的,该技术综合利用了多种结构因素。对初始粉末进行研磨可在加热初期加速相的形成,从而形成各向异性的细粒微结构,并保持研磨粉末颗粒的形状和尺寸。钼微添加剂抑制了高温变形过程中的扩散过程,而沿边界的偏析以及在机械活化和热机械加工过程中就地形成的超细复合氧化物颗粒的分布则增强了分散强化机制。优化热机械加工工艺可进一步强化这些结构因素。在 1100°C 煅烧后,掺钼合金表现出更高的低温强度,但断裂韧性降低,并有脱层倾向。随后在 1300°C 下进行的退火可纠正这些缺陷,但会增加晶粒大小和第二相颗粒。在接近动态再结晶的条件下,通过在 1200°C 下进行三次锻造,可获得最佳结构和机械性能,室温强度高达 1600-1900 兆帕。掺钼合金在 700°C 下拉伸时的极限强度为 300-330 兆帕。在 750°C 时,2% Mo 合金的蠕变速率降至 8.4 × 10-7 s-1,5% Mo 合金的蠕变速率降至 3.7 × 10-7 s-1,与现代奥氏体钢相当。
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来源期刊
JOM
JOM 工程技术-材料科学:综合
CiteScore
4.50
自引率
3.80%
发文量
540
审稿时长
2.8 months
期刊介绍: JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.
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