Effects of Ti addition on the microstructural and mechanical property evolution of FeCrB alloys have been systematically studied through experiments and modeling. Microstructural analysis reveals that Ti addition can induce the formation of in situ nanoparticles which can be mainly divided into two categories based on their distribution types. The first are the interfacial ones accumulating on the boride surface to control their growth, while the second are the intragranular ones distributed in the matrix to reinforce the FeCrB alloys. Model predictions show that the nanoparticle-induced growth restriction is responsible for the microstructural refinement. The refined microstructure and reinforcing nanoparticles can lead to the enhanced mechanical properties of FeCrB alloys. When the Ti addition reaches 1.4 wt pct, the FeCrB alloy exhibits the most refined and homogeneous microstructure and thus the optimal performance with its microhardness, macrohardness, ultimate tensile strength, elongation, impact toughness, and the wear-resistant performance are increased by 31.9, 29.0, 39.7, 128.6, 27.3, and 350 pct, respectively, compared with the base alloy.

通过实验和模型系统地研究了添加Ti对FeCrB合金的组织和力学性能演变的影响。显微组织分析表明，添加钛可以诱导原位形成纳米粒子根据其分布类型可主要分为两类。第一种是聚集在硼化物表面上以控制其生长的界面，而第二种是分布在基体中以增强FeCrB合金的颗粒内的。模型预测表明，纳米颗粒诱导的生长限制是微观结构完善的原因。细化的微观结构和增强的纳米粒子可以提高FeCrB合金的机械性能。当Ti添加量达到1.4 wt pct时，FeCrB合金表现出最细化和均匀的显微组织，因此其显微硬度，宏观硬度，极限抗拉强度，伸长率，冲击韧性和耐磨性能的最佳性能提高了31.9， 29.0、39.7、128.6，