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首页> 外文期刊>Materials Science and Engineering >On the nucleation and dissolution process of Z-phase Cr(V,Nb)N in martensitic 12%Cr steels
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On the nucleation and dissolution process of Z-phase Cr(V,Nb)N in martensitic 12%Cr steels

机译：Z相Cr（V，Nb）N在马氏体12％Cr钢中的形核和溶解过程

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摘要

Precipitation of large Z-phase particles, Cr(V,Nb)N, replacing fine MX nitrides, (V,Nb)N, has recently been identified as a major cause of premature breakdown in long-term creep strength of a number of new 9-12%Cr martensitic steels. The Z-phase precipitates slowly during long-term exposure at around 650 ℃ accelerated by high Cr content in the steels. It appears that the nucleation process controls the precipitation rate of Z-phase. A 12%Cr steel, which had precipitated Z-phase during long-term operation at 660℃/12,000h, was further heat treated in order to investigate the dissolution and reappearance processes for the Z-phase. In both cases it appears that Z-phase and MX phase are in physical contact and have a preferred crystallographic orientation relationship. The proposed nucleation mechanism is a chromium diffusion controlled transformation of MX into Z-phase, which explains the rather low precipitation rate of Z-phase.
机译：现已发现，大的Z相颗粒Cr（V，Nb）N的沉淀代替了精细的MX氮化物（V，Nb）N的沉淀，是许多新的长期蠕变强度过早破坏的主要原因。 9-12％Cr马氏体钢。在650℃左右的长期暴露下，由于高Cr含量导致Z相析出缓慢。看来成核过程控制着Z相的沉淀速率。为了研究Z相的溶解和重现过程，对在660℃/ 12,000h的长期运行中Z相析出的12％Cr钢进行了进一步热处理。在两种情况下，似乎Z相和MX相处于物理接触并且具有优选的晶体学取向关系。拟议的成核机理是铬扩散控制的MX转变为Z相，这解释了Z相的析出速率较低。

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