Review on the microstructure and mechanical properties of TiC-NbC synergistically strengthened iron-based alloy wear-resistant coatings
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摘要: 在高温、重载、高速摩擦等极端工况下,采用先进的表面工程技术在钢铁基体表面制备铁基耐磨涂层是延长关键部件服役寿命、实现资源循环利用的有效途径。传统Fe-Cr-C合金中常形成粗大的M7C3型初生碳化物,这些脆性相易在苛刻服役环境下成为裂纹源,影响涂层使用寿命。引入Nb元素可在晶界析出尺寸细小的NbC,从而抑制裂纹萌生并降低开裂倾向。然而,过量添加Nb会导致NbC偏聚并形成粗大颗粒,不利于提升涂层性能。进一步引入Ti元素能够与C原位反应形成稳定且高硬度的TiC,并作为NbC的异质形核核心,从而实现组织的细化与均匀化,有效改善涂层的综合性能。文章综述了原位生成TiC与NbC协同作用的形核机制及Fe-Cr-C合金涂层中引入Nb、Ti元素对涂层显微组织和力学性能的影响,为高性能耐磨铁基合金涂层的应用研究提供理论支撑。Abstract: Under extreme operating conditions such as high temperature, heavy load, and high-speed friction, applying advanced surface engineering technologies to fabricate iron-based wear-resistant coatings on steel substrates is an effective approach to extend the service life of critical components and promote resource recycling. In conventional Fe-Cr-C alloys, coarse primary M7C3-type carbides often form; these brittle phases can readily become crack initiation sites under severe service conditions, compromising the coating’s durability. The addition of Nb can lead to the precipitation of fine NbC particles at grain boundaries, thereby suppressing crack initiation and reducing the propensity for cracking. However, excessive Nb addition may cause NbC to agglomerate and form coarse particles, which is detrimental to coating performance. Further introduction of Ti enables in-situ reactions with C to form stable and high-hardness TiC, which can act as heterogeneous nucleation sites for NbC, thus refining and homogenizing the microstructure and effectively enhancing the overall properties of the coating. This review summarizes the nucleation mechanisms involving the synergistic effect of in-situ formed TiC and NbC, and discusses the influence of Nb and Ti additions on the microstructure and mechanical properties of Fe-Cr-C-based alloy coatings, providing theoretical support for the applied research of high-performance wear-resistant iron-based alloy coatings.
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Key words:
- steel /
- iron-based alloys coating /
- TiC /
- NbC /
- microstructure /
- mechanical properties
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图 7 试样在冷却凝固过程中(
1273 K 保温 1 s)微观结构演变的原位观测结果[41]Figure 7. In-situ observation of the microstructure evolution of the alloy specimen during the cooling-solidification process (holding at
1273 K for 1 s) [41](a) 733.81 s, 1 533 K; (b) 733.10 s, 1 532 K; (c)739.07 s, 1 510 K; (d)741.90 s, 1 491 K; (e)783.18 s, 1 273 K; (f) 902.04 s, 632 K
Phase TiC NbC Asurf /nm2 Esurf/(J·m-2) Asurf/nm2 Esurf (J·m-2) (100) 0.1974 0.6645 0.2122 0.6171 (110) 0.2954 1.6087 0.3188 1.3101 (111) 0.1802 70.2871 0.194 65.0208 (210) 0.4965 1.2309 0.5364 1.0992 (211) 0.5173 1.9870 0.5561 1.3397 表 2 Nb元素对合金磨损量、抗拉强度影响[17]
Table 2. Effect of Nb element on wear loss and tensile strength of alloys[17]
Experimental condition Mass loss /mg Tensile strength /MPa No addition of Nb 82 150 Added Nb 60 300 表 3 不同条件下涂层硬度、冲击韧性及磨损量对比[48]
Table 3. Comparison of coating hardness, impact toughness, and wear loss under different conditions[48]
Experimental condition Microhardness (HRC) Impact toughness /J Wear amount /g Only add Nb 46.2 11 0.8161 Composite addition of Nb and Ti 45.2 16 0.5844 表 4 不同Nb/Ti对涂层硬度及磨损量的影响
Table 4. Effect of different Nb/Ti ratios on coating hardness and wear loss
表 5 Nb元素对力学性能的影响汇总
Table 5. Summary of the effect of niobium on mechanical properties
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