通过对不同淬火温度的ZG1Cr10MoWVNbN耐热钢试样进行高温蠕变持久试验和金相分析, 研究了δ铁素体对其持久强度的影响。结果表明: 该耐热钢中的δ铁素体呈带状分布, 降低了马氏体基体的连续性, 使得该钢持久强度下降, 并且δ铁素体含量越高, 试样持久试验时间则越短; 同时由于δ铁素体中固溶了大量合金元素, 降低了马氏体基体中的合金元素含量, 减弱了马氏体耐热钢的固溶强化和沉淀强化作用, 这也会降低该钢的高温持久强度。

Through high temperature creep rupture test and metallographic analysis for ZG1Cr10MoWVNbN heat resistant steel samples with different quenching temperature, the influence of δ-ferrite on creep rupture strength of the steel was studied. The results show that the δ-ferrite presented banded distribution in the steels, which reduced the continuity of martensite matrix and creep rupture strength of the steel, and the higher the δ-ferrite content was, and the shorter the creep rupture test time was. At the same time, because the δ-ferrite dissolved a great deal of alloying elements, which made the alloy element content of martensite matrix decrease, the solid solution strengthening and precipitation strengthening effect weaken, and the high temperature creep rupture strength of the steel decrease.