800℃时效过程中P92钢中M23C6碳化物的熟化行为

IF 3.1 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-08-01 DOI:10.1016/S1006-706X(17)30127-9

Xu Yang , Bo Liao , Fu-ren Xiao , Wei Yan , Yi-yin Shan , Ke Yang

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引用次数: 14

摘要

M23C6碳化物的快速粗化是导致9-12Cr马氏体耐热钢蠕变断裂的主要原因。在800℃的高温下对一种P92钢进行热时效，研究了M23C6碳化物的熟化行为。采用扫描电镜(SEM)和透射电镜(TEM)对M23C6碳化物的微观结构演变进行了表征，尤其是其成熟过程。引入了依赖于临界半径的有效平均尺寸的新概念，对测量的平均尺寸进行了修正，并应用奥斯特瓦尔德理论描述了M23C6碳化物的成熟行为。M23C6碳化物的成熟受晶界扩散控制。

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Ripening behavior of M23C6 carbides in P92 steel during aging at 800 °C

The rapid coarsening of the M₂₃C₆ carbides has been held responsible for the creep fracture in 9–12Cr martensitic heat resistant steels. A commercial P92 steel was subjected to thermal aging at a high temperature of 800 °C to investigate the ripening behavior of the M₂₃C₆ carbides. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize the microstructure evolution, especially the ripening process of the M₂₃C₆ carbides. The new concept of the effective mean size, dependent on the critical radius, was introduced to correct the measured mean size and then the Ostwald theory was applied to describe the ripening behavior of the M₂₃C₆ carbides. The ripening of the M₂₃C₆ carbides was revealed to be grain boundary diffusion controlled.