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本文结合10Cr5MoWVTiB钢(106号钢)探讨了硼和铬在中铬多元热强钢中的作用,并对它们的作用机制进行了分析。 试验结果表明:硼有效地提高了106号钢的热强性和抗氧化性。适量硼对热强性的贡献主要归功于硼对碳化物数量及热稳定性的影响。理论分析表明:硼对沉淀强化、固溶强化和晶界强化均有贡献。硼提高钢抗氧化性是由于它促进铬向氧化膜中扩散所致。运用硼原子-空位相互作用假设可以较完满地解释硼的作用。 试验结果还表明:钢中铬含量越高,抗氧化性越好,但铬含量的提高使钢的热强性降低,铬富集在氧化膜里是它提高钢抗氧化性的原因,铬降低沉淀强化相的热稳定性和促进δ-铁素体的形成是它降低钢热强性的主要原因。
In this paper, 10Cr5MoWVTiB steel (106 steel) to explore the role of boron and chromium in multi-chromium hot chrome, and their mechanism of action were analyzed. The experimental results show that boron can effectively improve the hot strength and oxidation resistance of 106 steel. The amount of boron on the contribution of thermodynamics mainly due to boron on the carbide quantity and thermal stability. Theoretical analysis shows that boron contributes to precipitation strengthening, solid solution strengthening and grain boundary strengthening. Boron enhances the oxidation resistance of steel due to its ability to promote the diffusion of chromium into the oxide film. The role of boron can be explained more satisfactorily by using the boron atom - vacancy interaction hypothesis. The results also show that the higher the content of chromium in steel, the better the oxidation resistance, but the increase of chromium content decreases the thermal strength of steel. The reason why chromium is enriched in the oxide film is that it enhances the oxidation resistance of steel. The thermal stability of precipitated strengthening phase and the promotion of δ-ferrite formation are the main reasons that it reduces the thermal strength of steel.