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用 2 k W Nd:YAG激光在 4 0 Cr钢基体上制取了 Si C强化的 Fe基复合材料涂层 ,并对熔覆层进行了显微组织结构和性能测试 .加入的 Si C包括颗粒状和纤维状两种形态 ,通过调整颗粒状Si Cp和纤维状 Si Cf的加入量 ,研究了 Si C在激光熔覆过程中的演变、存在形式及对熔覆层硬度的影响 .结果表明 ,随着加入量的增加 ,熔覆层中未熔 Si C含量增加 ,熔覆层硬度也随之提高 ;对比加入颗粒状和纤维状 Si C的熔覆层的显微硬度表明 ,同含量情况下纤维状 Si C的强化效果更显著 ;造成熔覆层硬度显著提高的原因是未熔 Si C,析出相 Fe Si C的弥散强化和熔入的 Si,C元素引起的固溶强化作用 .
The Si C-reinforced Fe-based composite coatings were prepared on a 40 Cr steel substrate by 2 k W Nd: YAG laser and the microstructure and properties of the coatings were tested.The addition of Si C includes particles Like shape and fibrous shape, the evolution, existence form and hardness of Si C during laser cladding process were studied by adjusting the addition amount of Si Cp and Si Cp.The results showed that, With the increase of the amount of addition, the content of unmelted Si C in the coating increases, and the hardness of the coating increases accordingly. The microhardness of the coating which is compared with the addition of granular and fibrous Si C shows that under the same content The strengthening effect of fiber-like Si C is more remarkable. The reasons for the significant increase of the hardness of the cladding layer are the diffusion strengthening of unmelted Si C and the precipitated phase Fe Si C and the solid solution strengthening effect of Si and C elements melted.