Evolution of NbC from nucleation and precipitation to growth and coarsening in Nb-microalloyed high-carbon martensitic steel

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-05-30 DOI:10.1016/j.matlet.2025.138860

Di Wang, Jun Xiao, Kuo Cao, Shaoguang Yang, Aimin Zhao

引用次数: 0

Abstract

This study focuses on the dynamic evolution of NbC from nucleation and precipitation to coarsening in synergy with Mo. The results show that carbon diffusion drives the precipitation of Nb-C clusters from the supersaturated austenite, forming NbC precipitates smaller than 5 nm. As the NbC particles grow to ∼200 nm, Mo atoms gradually substitute Nb sites via diffusion, resulting in compositionally graded (Nb,Mo)C complex carbides, with Mo content increasing monotonically with particle size. Initially, the (Nb,Mo)C particles exhibit a near-spherical morphology. In the late stage of coarsening (>500 nm), they gradually transform into irregular polyhedral shapes, accompanied by a decrease in proportion of Mo content.

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铌微合金高碳马氏体钢中NbC从形核析出到生长粗化的演变

研究了NbC在Mo的协同作用下从成核、析出到粗化的动态演化过程。结果表明，碳的扩散驱动了过饱和奥氏体中Nb-C团簇的析出，形成了小于5 nm的NbC相。当NbC颗粒生长到~ 200 nm时，Mo原子通过扩散逐渐取代Nb位点，形成成分梯度的（Nb,Mo）C络合物碳化物，Mo含量随颗粒尺寸单调增加。最初，（Nb,Mo）C颗粒呈现近球形形态。在粗化后期（>500 nm），它们逐渐转变为不规则多面体形状，同时Mo含量比例降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive