Alloying element Ti plays an important role in improving the mechanical properties of hypereutectic FeCrC hardfacing coating, but its peeling resistance have been neglected. Here, the hardness and wear rate of the hypereutectic FeCrC and FeCrCTi hardfacing coatings were measured. The crystal structure and orientation relationship of primary M₇C₃ carbide and eutectic austenite matrix were confirmed. Then, the interface properties of γ-Fe//M₇C₃(Ti) interface were calculated by first principles. The results show that the micro-Vickers and macroscopic Rockwell hardness of the FeCrCTi hardfacing coating are increased, and its wear rate is decreased from (4.33 ± 0.333) × 10⁻⁶ mm³/Nm to (3.64 ± 0.366) × 10⁻⁶ mm³/Nm. The Ti-doping can effectively inhibit the initiation and propagation of cracks and improve the peeling resistance of M₇C₃ carbide. Meanwhile, the orientation relationship of eutectic austenite/primary M₇C₃ carbide is γ-Fe(1 1 1)//(Cr, Fe)₇C₃(10$\overline{\text{1}}$0). Among CFe1, CrFe1 and FeFe1 interfaces, interface energy of FeFe1 model is the smallest (1.954 J/m²), and its adhesion work (W_ad) is the largest (0.756 J/m²). Moreover, W_ad of Ti-doped interface (4.123 J/m²) is larger than that of FeFe1 one (3.045 J/m²) after relaxed, which indicates Ti-doping is beneficial to enhance adhesive strength between γ-Fe//M₇C₃ interfaces, which improves the peeling resistance of M₇C₃ carbide.

合金元素Ti对提高过共晶Fe Cr C堆焊层的力学性能有重要作用，但其抗剥离性却被忽视。在这里，测量了过共晶 Fe Cr C 和 Fe Cr C Ti 表面硬化涂层的硬度和磨损率。确定了初生M ₇ C ₃碳化物和共晶奥氏体基体的晶体结构和取向关系。然后，利用第一性原理计算了γ-Fe//M ₇ C ₃ (Ti)界面的界面性质。结果表明，Fe Cr C的显微维氏硬度和宏观洛氏硬度Ti表面硬化涂层增加，其磨损率从(4.33±0.333)×10 ^-6  mm ³ /Nm降低到(3.64±0.366)×10 ^-6  mm ³ /Nm。Ti的掺杂可以有效抑制裂纹的萌生和扩展，提高M ₇ C ₃碳化物的抗剥离性。同时，共晶奥氏体/初生M ₇ C ₃碳化物的取向关系为γ-Fe(1  1  1)//(Cr, Fe) ₇ C ₃ (10$\overline{\text{1}}$0）。在C Fe1、Cr Fe1和Fe Fe1界面中，Fe Fe1模型的界面能最小（1.954 J/m ²），粘附功（W _ad）最大（0.756 J/m ²）。此外，Ti掺杂界面的Wad（4.123 J/m ²）在松弛后比Fe Fe1界面的W _ad大（3.045 J/m ²），这表明Ti掺杂有利于增强γ-Fe/ /M ₇ C ₃界面，提高了M ₇ C ₃碳化物的抗剥离性。