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以10种Mo元素含量不同的耐火钢试样为研究对象,通过贝氏体化热处理与铁素体化热处理两种工艺得到不同组织,并研究了Mo对耐火钢性能的强化机理。结果表明:当Mo<0.3wt%时,Mo的固溶强化可显著提高耐火钢的高温力学性能;Mo≥0.3wt%时,固溶强化与沉淀强化共同提高耐火钢的高温力学性能;Mo<0.3wt%时,固溶强化效果与Mo含量0.3wt%~0.5wt%的沉淀强化作用效果基本相同;当Mo≥0.5wt%后,强化效果逐渐减弱。
Ten kinds of refractory steel samples with different Mo contents were selected as the research objects. Different structures were obtained by bainitic heat treatment and ferritic heat treatment. The strengthening mechanism of Mo on the properties of fire-resistant steel was also studied. The results show that when Mo is less than 0.3wt%, the solid solution strengthening of Mo can obviously improve the mechanical properties of refractory steel. When Mo≥0.3wt%, both the solid solution strengthening and precipitation strengthening jointly improve the mechanical properties of refractory steel. Mo < 0.3wt%, the solid solution strengthening effect and the Mo content of 0.3wt% ~ 0.5wt% precipitation strengthening effect is basically the same; when Mo ≥ 0.5wt%, the strengthening effect gradually weakened.