钼对连续冷却过程中 Nb-V-N 微合金钢针状铁素体转变和相间析出的影响

IF 2.5 2区 材料科学
Jing Zhang, Wen-bin Xin, Deng-yun Hou, Jun Peng, Zhi-bo Zhao, Yang Tong
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引用次数: 0

摘要

使用 Gleeble 3800 热机械模拟器研究了钼含量从 0 到 0.26 和 0.50 wt.%对通过热变形和连续冷却处理的 Nb-V-N 微合金钢的微结构演变和 MX(M = Nb、V 和 Mo;X = C 和 N)析出特性的实质性影响。金相分析表明,铁素体微观结构从 0Mo 钢中的多边形铁素体(PF)转变为 0.26Mo 和 0.50Mo 钢中的针状铁素体(AF)和 PF,且 AF 含量先增加后减少。热力学计算和实验结果证明,奥氏体中 Mo 的固溶体量明显增加,降低了奥氏体(γ)向铁素体(α)的转变温度,从而促进了 0.26Mo 钢中 AF 的形成和 0.50Mo 钢中贝氏体的转变。此外,在奥氏体区温度下析出的亚微米富Nb MX颗粒进一步诱导了AF异质成核,其取向关系为((011)_{{text/{MX}}}}//(100)_{{{\text{Ferrite}}}}\) and \([1\overline{1}1]_{{{\text{MX}}}} //[001]_{{{\text{Ferrite}}}}\).在γ → α转化过程中析出的富含V的纳米级MX颗粒的相间沉淀与Mo的分配呈现出贝克-纽丁取向关系((\left( {100} \right)_{{{text{MX}}}}//\和(left[ {001} \right]_{{{text\{MX}}}}//\left[ {01\overline{1} } \right]_{{{text{Ferrite}}}}\) 相对于铁氧体基体。随着钼含量从0增加到0.26和0.50 wt.%,薄片间距分别从46.9-49.0 nm减小到34.6-38.6 nm和25.7-28.0 nm,这显然阻碍了位错运动,大大增强了沉淀强化。此外,促进 AF 形成和相间析出有利于改善钢的性能,最佳 Mo 含量为 0.26 wt.%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of Mo on acicular ferrite transformation and interphase precipitation of Nb–V–N microalloyed steel during a continuous cooling process

Effect of Mo on acicular ferrite transformation and interphase precipitation of Nb–V–N microalloyed steel during a continuous cooling process

The substantial influences of Mo contents varying from 0 to 0.26 and 0.50 wt.% on the microstructural evolution and MX (M = Nb, V and Mo; X = C and N) precipitation characteristics of Nb–V–N microalloyed steels processed by hot deformation and continuous cooling were studied using a Gleeble 3800 thermomechanical simulator. Metallographic analysis showed that the ferrite microstructure transformed from polygonal ferrite (PF) in 0Mo steel to both acicular ferrite (AF) and PF in 0.26Mo and 0.50Mo steels, and AF content first increased and then decreased. The thermodynamic calculations and the experimental results proved that the quantity of solid solution of Mo in austenite obviously increased, which reduced the austenite (γ) to ferrite (α) transformation temperature, consequently promoting AF formation in 0.26Mo steel and bainite transformation in 0.50Mo steel. Moreover, the submicron Nb-rich MX particles that precipitated at the temperature of the austenite region further induced AF heterogeneous nucleation with an orientation relationship of \((011)_{{{\text{MX}}}} //(100)_{{{\text{Ferrite}}}}\) and \([1\overline{1}1]_{{{\text{MX}}}} //[001]_{{{\text{Ferrite}}}}\). The interphase precipitation of the nanosized V-rich MX particles with Mo partitioning that precipitated during γ → α transformation exhibited a Baker–Nutting orientation relationship of \(\left( {100} \right)_{{{\text{MX}}}} //\left( {100} \right)_{{{\text{Ferrite}}}}\) and \(\left[ {001} \right]_{{{\text{MX}}}} //\left[ {01\overline{1}} \right]_{{{\text{Ferrite}}}}\) with respect to the ferrite matrix. With increasing Mo content from 0 to 0.26 and 0.50 wt.%, the sheet spacing decreased from 46.9–49.0 to 34.6–38.6 and 25.7–28.0 nm, respectively, which evidently hindered dislocation movement and greatly enhanced precipitation strengthening. Furthermore, facilitating AF formation and interphase precipitation was beneficial to improving steel properties, and the optimal Mo content was 0.26 wt.%.

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来源期刊
自引率
16.00%
发文量
161
审稿时长
2.8 months
期刊介绍: Publishes critically reviewed original research of archival significance Covers hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, physical chemistry, solidification, mechanical working, solid state reactions, materials processing, and more Includes welding & joining, surface treatment, mathematical modeling, corrosion, wear and abrasion Journal of Iron and Steel Research International publishes original papers and occasional invited reviews on aspects of research and technology in the process metallurgy and metallic materials. Coverage emphasizes the relationships among the processing, structure and properties of metals, including advanced steel materials, superalloy, intermetallics, metallic functional materials, powder metallurgy, structural titanium alloy, composite steel materials, high entropy alloy, amorphous alloys, metallic nanomaterials, etc..
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