Ti含量对高Ti马氏体耐磨钢组织与性能的影响

测定了0.31%Ti和0.55%Ti两种高Ti低合金马氏体耐磨钢的力学性能及耐磨性,并使用扫描电镜、夹杂物自动扫描系统对其显微组织进行了分析,进而讨论了高Ti钢中Ti含量对组织和性能的影响。结果表明,与含Ti量0.31%时相比,含Ti量达到0.55%时,基体中有更多的TiC颗粒析出,降低了基体的C当量,导致淬火后钢的抗拉强度明显较低,但更多TiC的析出也产生更为明显的析出强化效果,使得两种钢的屈服强度和硬度较为接近。另一方面,含Ti量较高时钢中微米级的TiC颗粒相应增加,显著提高了钢的耐磨性能。

Effect of Ti content on microstructure and properties of martensitic wear resistant steel with high Ti

Mechanical properties and wear resistance of low alloy martensitic wear resistant steels with 0.31%Ti and 0.55%Ti were measured, and the corresponding microstructure was analyzed by SEM and inclusion automatic scanning system, then the effect of Ti content in the steel on microstructure and properties was discussed. The results show that compared with the steel containing 0.31%Ti, the steel containing 0.55%Ti has more precipitation of TiC particles, which reduces the C equivalent of the matrix, resulting in a significantly lower tensile strength of the quenched steel, but more TiC precipitation also produces stronger precipitation strengthening, which makes the yield strength and hardness of the two steels close to each other. On the other hand, when the Ti content is higher, the micron-sized TiC particles in the steel increase correspondingly, which significantly improves the wear resistance of the tested steel.