The creep resistance of the 9% Cr–1% W–1% Mo steel subjected to quenching from the temperatures of 1050 and 1150°C, cooling in the air, and further tempering at a temperature of 750°C for 3 h has been studied at a temperature of 650°C and applied stresses of 160, 140, and 120 MPa. An increase in the quenching temperature from 1050 to 1150°C leads to a growth in the average size of prior austenite grains from 25 to 93 µm due to the dissolution of MX carbonitride particles enriched in niobium under exposure in the austenite region. An increase in the size of the prior austenite grains is accompanied by a decrease in the average size of blocks and martensite laths by 17 and 43%, respectively. Moreover, an increased temperature of heating for quenching provides favorable conditions (fraction of boundaries, density of dislocations, and content of doping elements in a solid solution) for the precipitation of carbide М₂₃С₆ and carbonitride МХ particles of smaller size under tempering. The improvement of structural hardening due to a decreased size of blocks and martensite laths and dispersion hardening due to nanosized VX particles has a positive effect on the creep resistance by decreasing the minimum creep rate and the duration of the transient creep stage to increase the time until rupture by several times.

9% Cr–1% W–1% Mo 钢在 1050 和 1150°C 温度下淬火，空冷，再在 750°C 温度下回火 3 h 后的抗蠕变性为在 650°C 的温度和 160、140 和 120 MPa 的施加应力下进行了研究。淬火温度从 1050°C 增加到 1150°C 会导致原奥氏体晶粒的平均尺寸从 25 μm 增长到 93 μm，这是由于暴露在奥氏体区域中富含铌的 MX 碳氮化物颗粒溶解。原始奥氏体晶粒尺寸的增加伴随着块和马氏体板条的平均尺寸分​​别减少 17% 和 43%。此外，提高淬火加热温度提供了有利的条件（边界分数、位错密度、₂₃ С ₆和碳氮化物МХ 颗粒在回火下尺寸较小。由于块体和马氏体板条尺寸的减小以及纳米尺寸 VX 颗粒引起的分散硬化对结构硬化的改善对抗蠕变性有积极的影响，它通过降低最小蠕变速率和瞬态蠕变阶段的持续时间来增加直到破裂数次。