试验研究了X12CrMoWVNbN10-1—1耐热钢的显微组织和高温力学性能。结果表明：该钢经1075℃×1h油冷淬火＋570℃×4h，空冷一次回火＋720℃×2h，空冷二次回火后的显微组织为典型的回火板条状马氏体组织，在原奥氏体晶界和板条界分布M23C6型碳化物，在马氏体板条内分布有纳米尺寸的MX相，此外还有少量在淬火加热时未溶解的尺寸达到0．6μm的残余MX相；在500～650℃范围内抗拉强度和屈服强度随试验温度的升高而降低，伸长率和断面收缩率随试验温度的升高而升高；持久强度与Larson—Miller参数P=T（25＋lg（tf））／1000之间符合抛物线关系。
Microstructure and high temperature mechanical properties of X12CrMoWVNbN10-1-1 heat resistant steel were studied by SEM and TEM. The results show that a typical tempered lath martensitie mierostrueture of the steel is obtained by quenching at 1075 ℃ for 1 h, cooling in oil followed by twice tempering treatments at 570 ℃ for 4 h, cooling in air and then 720 ℃ for 4 h, cooling in air. M23C6- type carbides are distributed along prior austenite grain boundaries and lath boundaries. Nanosized MX-type precipitates are observed in matrix within the laths. There are small amount of undissovled MX-type particles with size up to 0.6 p,m during the quenching heat treatment. The tensile and yield strength of the steel decreases while the elongation and reduction in area increase with the increasing temperature when testing in the temperature range of 500 - 650 ℃. The stress rupture strength has a parabolic curve relationship with Larson-Miller parameter P = T(25 + lg(tf) )/1000.
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