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透射电子显微镜观察表明,经过Ti注入的钢,表面形成了直径为3.5～20nm的FeTi_2相,镶嵌在注入层中,其平均直径为8nm。靶温在400℃注入时,这些纳米相出现在位错和晶界处。这种镶嵌的结构具有很强的抗磨损特性和抗腐蚀特性。经过退火后,这种结果将发生变化。在350～500℃退火20min后,其结构没有明显的变化,但是注入层的硬度得到了明显的提高。经过500℃退火后,表面硬度最高。说明退火能有效地增强表面强化效果。当退火温度为750℃和1000℃时,位错和晶界消失,纳米相平均直径分别增加到10 nm和15 nm。其平均密度分别为8.8×10~(10)/cm~2和6.5×10~(10)/cm~2。注入硬度明显下降,说明基体软化。
Transmission electron microscopy showed that the Ti-infiltrated steel had a FeTi_2 phase 3.5 ~ 20nm in diameter and was embedded in the implanted layer with an average diameter of 8nm. When the target temperature is injected at 400 ° C, these nanophases appear at dislocations and grain boundaries. This inlaid structure has a strong anti-wear and anti-corrosion properties. After annealing, this result will change. After annealed at 350-500 ℃ for 20min, the structure did not change obviously, but the hardness of the implanted layer was obviously improved. After 500 ℃ annealing, the highest surface hardness. Annealing can effectively enhance the surface strengthening effect. When the annealing temperature is 750 ℃ and 1000 ℃, the dislocation and grain boundary disappear, and the average diameter of nanophase increases to 10 nm and 15 nm, respectively. The average density was 8.8 × 10 ~ (10) / cm ~ 2 and 6.5 × 10 ~ (10) / cm ~ 2, respectively. Injection hardness decreased significantly, indicating that the matrix softened.