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On the origin of the superior long-term creep resistance of a 10% Cr steel

机译：源自10％Cr钢卓越的长期抗蠕变性

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A low-nitrogen 10% Cr martensitic steel containing 3% Co and 0.008% B was shown to exhibit an extremely long creep rupture time of ～ 4·10~4 h under an applied stress of 120 MPa at 650 ℃. The creep behavior and evolution of lath martensite structure and precipitates during creep at these conditions were studied. The main feature of the microstructure under long-term creep is retention of the lath structure until rupture. The following micro-structural factors affecting the superior creep resistance were analyzed: (1) alloying by (W+Mo) elements; (2) particles of M_(23)C_6 and Laves phases; (3) homogeneously distributed M(C,N) carbonitrides. It was revealed that nanoscale M_(23)C_6 carbides and M(C,N) carbonitrides compensated the negative effects of W depletion from the solid solution and extensive coarsening of the Laves phase particles. M_(23)C_6 carbides demonstrate a high coarsening resistance under creep conditions and exert a high Zener drag pressure before rupture because of the coherency of their interfaces. The strain-induced transformation of a portion of the precipitated V-rich M(C,N) carbonitrides to the Z-phase does not affect the creep strength because the Z-phase particles are nanoscale and negligible in quantity.
机译：含有3％Co和0.008％B的低氮10％Cr马氏体钢在650℃施加120 MPa的应力时表现出极长的〜4·10〜4 h蠕变断裂时间。研究了在这些条件下蠕变过程中板条马氏体组织和析出物的蠕变行为和演化。长期蠕变下的显微组织的主要特征是板条结构保持破裂。分析了影响优良的抗蠕变性的以下微观结构因素：（1）通过（W + Mo）元素进行合金化； （2）M_（23）C_6和Laves相的粒子; （3）均匀分布的M（C，N）碳氮化物。结果表明，纳米级M_（23）C_6碳化物和M（C，N）碳氮化物补偿了固溶体中W耗竭和Laves相颗粒的粗化的不利影响。 M_（23）C_6碳化物在蠕变条件下表现出较高的抗粗化性，并且由于其界面的连贯性而在破裂前施加了较高的齐纳阻力。一部分沉淀的富V的M（C，N）碳氮化物的应变诱导转变为Z相不会影响蠕变强度，因为Z相颗粒为纳米级且数量可忽略不计。

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