论文部分内容阅读
9-12%Cr钢的强化机理为析出强化、弥散强化和位错强化。分布于原奥氏体晶界、板条界等位置的M23C6及板条内部弥散分布的MX是主要强化相,特定条件下的Laves相也会起强化作用。伴随着M23C6的聚集长大、MX的粗化及Z相的析出,马氏体发生回复,位错运动障碍减小,蠕变性能逐渐下降。微合金元素C、N、Ti、V、B的加入可以控制M23C6及MX数量及分布形态,从而抑制马氏体板条的回复及增加位错运动障碍,保持9-12%Cr钢的蠕变性能。
The strengthening mechanism of 9-12% Cr steel is precipitation strengthening, dispersion strengthening and dislocation strengthening. M23C6 distributed in the original austenite grain boundaries and the slab boundary, and MX dispersed in the slab are the main strengthening phases, and the Laves phase under certain conditions also plays a strengthening role. Along with the aggregation and growth of M23C6, the coarsening of MX and the precipitation of Z phase, the martensite is recovered, the dislocation movement disorder is reduced and the creep property is gradually decreased. The addition of micro-alloying elements C, N, Ti, V and B can control the amount and distribution of M23C6 and MX, so as to restrain the recovery of martensite lath and increase the dislocation movement obstacle, and maintain the creep of 9-12% Cr steel performance.