2024年8月1日 · TEM characterizations showed that the multiple additions of V and Nb resulted in B1 structured alloy carbides with (V,Nb)C-cores and VC-shells, resulting in denser carbide precipitation compared to single additions of these elements.

2023年7月10日 · The micron–sized coarse (V, Nb, Ti) (C, N) particles were the main factor responsible for the low impact energy (35.5 J) at room temperature and high DBTT (−7 °C) of V–Nb–Ti steel and can act as the local cleavage initiation sites to dominate the cleavage fracture at low temperature and decrease the impact toughness.

2024年5月30日 · Correlative microscopy is an advanced technique that has been performed to elucidate precipitation behavior of a V–Nb–Mo micro-alloyed steel. The same sample region was analyzed using transmission electron microscope (TEM) and transmission Kikuchi diffraction (TKD) to comprehend the impact of microscale grain boundary character on the ...

2024年11月20日 · The results show that Nb-V composite micro-alloyed steel possessed a higher yield strength compared with Nb or V micro-alloyed steel when quenched at 870 °C and tempered at 450–650 °C.

2025年1月20日 · Compared to equimolar Ti-V-Zr-Nb, a (Ti1.5V)3ZrNb composition demonstrated an impressive 360% improvement in elongation while sustaining a high yield strength of around 800 MPa. Increasing Ti and V not only purified the grain boundaries by reducing detrimental phases, but also tailored the deformation dislocation configurations.

2023年4月14日 · 以Ti-Zr-V-Nb-Al体系BCC高熵合金为研究模型，辅以适当的热处理工艺，平面滑移（planar slip）诱导变形局域化这一削弱拉伸塑性的机制转变为“多级”平面滑移促进变形均匀化的塑性提升机制。

为了探究V和B元素复合添加对β型γ-TiAl合金的显微组织和变形机制产生的影响，本工作针对Ti-44Al-5Nb-1Mo合金和Ti-44Al-5Nb-1Mo-2V-0.2B合金，进行了不同温度和应变速率条件下的高温热压缩实验，利用SEM-BSE和TEM对组织进行表征，对比分析了其变形后的显微组织，研究了 ...

2025年2月5日 · Equiatomic Ti–V–Ta and Ti–V–Ta–Nb alloys have shown an especially low neutron absorption cross-section and stable and strong mechanical properties at the temperatures up to 700–900 °C, which are essential for structural materials for nuclear applications [4, 5, 6].

最近，探索轻质高熵合金（HEA）作为未来工程材料的潜在应用一直是一个热门话题。在这项工作中，新型轻质 Ti 22 Sc 22 Zr 22 Nb 17 V 17、Ti 24 Sc 20 Zr 22 Nb 17 V 17、Ti 24 Sc 22 Zr 20 Nb 17 V 17和 Ti 26 Sc 20 Zr 20 Nb 17 V 17HEA是通过快速凝固制造的。采用 X 射线衍射光谱 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM ...

The optimal TBNV-3 composite achieved nearly 100% conversion with 99% selectivity for styrene epoxidation, superior to that of the most reported coupled photocatalysts. Systematic investigations...

结果表明，V与Nb能够通过在钢中形成碳化物使得原奥氏体晶粒细化和位错密度增加，引起钢中可逆氢陷阱密度增加，从而降低氢扩散系数以及提高钢中氢含量和氢扩散激活能。

2019年6月5日 · 研究了含Nb 低合金高强钢在不同时效工艺下的力学性能和显微组织，并采用扫描电镜 ( SEM) 和透射电镜 ( TEM) 及原位分析方法研究了时效过程中试验钢 ...

沉淀硬化 是一种有效的合金强化机制，这一机制可以提高高达150~300MPa的屈服强度。 Ti，Nb，Mo，Cr和V是高强度低合金钢铁素体组织中常用的合金元素。 为了达到显著的强化效果，析出物要结构完整且密度较高，这样才能有效的限制塑性加工过程中位错的运动。

Hydrogen embrittlement (HE) susceptibility was evaluated on JIS–SUP12-based steel (SB), and V-, Nb- and (Nb+Mo)-added steels (SV, SNb and SNbMo, respectively) under uniaxial tension and high stress tri-axiality conditions, to elucidate the roles of the microalloying elements in the HE mechanisms of 2 GPa-grade medium-carbon Si–Cr spring ...

Ti-Nb-Zr is a ternary metastable β titanium alloy designed based on d-electron orbital theory. It contains only β stabilizing element Nb and neutral element Zr, which helps reduce the risk of segregation of high melting point elements during the melting process.

2016年4月6日 · Phase transformation and deformation behavior of the NiTi-Nb eutectic microstructure were investigated using transmission electron microscopy (TEM) and cyclic loading-unloading tests. Results...

A 3D atom probe combined with TEM was applied to characterize carbides precipitation in Nb-V microalloyed steel aging at 550 °C for different times after being water-quenched from 1200 °C.

2018年11月5日 · Experiments show that there exists a miscibility gap in the low temperature region of Nb-V binary system. Two typical phase transition mechanisms of the spinodal decomposition and the nucleation-growth are observed. The thermodynamic parameters are assessed using CALPHAD approach.

The DOis phase, an A3B phase, is known to have a preference for Al on the B sites and a mixture of (Ti.Nb) on the A sites (Ref. 23 in [1]) in Ti-Al-Nb alloys. Thus stability of this phase with respect to HCP is expected across the entire (Ti,Nb)3Al sec- tion at 700 °C and hence the free energy curve for DOio is drawn below the HCP.

4 天之前 · The wide application of additive-manufactured Ti alloys is impeded by coarse columnar grains along the building direction and thus the severe anisotropy of mechanical properties. To address this issue, a novel multi-alloying CoCrMoSi strategy has been developed to produce near-equiaxed grains of a modified Ti6Al4V (TC4) alloy for laser-directed energy deposition (LDED) based on computational ...