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为了研究服役条件下的汽轮机叶片的微观组织演化行为,利用X射线衍射仪、光学显微镜、扫描电镜和透射电镜等手段详细表征了退役1Cr12Mo钢高压动叶片的微观组织结构,进而分析了不同温度和压力对微观组织的影响规律。试验结果表明,适当的应力能促进板条内部尤其是边界析出相弥散分布,维持细小组织特征;细小弥散的析出相能够延缓位错束集和位错胞亚晶的形成。位错胞亚晶的形成显著地降低位错密度;温度对马氏体及位错结构影响不大,但显著提高碳化物的长大速度。
In order to study the microstructure evolution of steam turbine blades under service conditions, the microstructure of decomposed 1Cr12Mo steel high-pressure moving blades was characterized in detail by means of X-ray diffraction, optical microscope, scanning electron microscope and transmission electron microscope. Then the effects of different temperatures and The influence of pressure on microstructure. The experimental results show that appropriate stress can promote the dispersion of precipitates within the slab, especially the boundary, and maintain the microstructure characteristics. The fine and dispersed precipitates can delay the formation of dislocation clusters and dislocations. Dislocation cell subgrain formation significantly reduces the dislocation density; temperature on the martensite and dislocation structure has little effect, but significantly increased carbide growth rate.