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首页> 外文会议>20th International Symposium on Effects of Radiation on Materials, Jun 6-8, 2000, Williamsburg, Virginia >Correlation Between Creep Properties and Microstructure of Reduced Activation Ferritic/Martensitic Steels
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Correlation Between Creep Properties and Microstructure of Reduced Activation Ferritic/Martensitic Steels

机译：还原活化铁素体/马氏体钢的蠕变性能与组织的相关性

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摘要

Reduced activation ferritic steels (RAFs), JLF1 (9Cr-2W-V,Ta steel) had been studied as one of the reference materials in the IEA RAF R&D activity, because of its superior resistance to high-fluence neutron irradiation up to 100 dpa. Recently, JLS-series (9Cr-xW-V,Ta steels; x=2.5, 3.0 and 3.5) have been produced as options for RAFs for use at higher temperatures in advanced blanket systems. In this series, improved high temperature mechanical properties were intended by increased tungsten contents. The creep properties improved with the tungsten contents. A microstructural examination after creep rupture test revealed differences with a increase of tungsten content from 2.0 (JLF-1) to 3.0 wt% (JLS-2). According to the examination of tested specimens (100 MPa, 700℃), more intragranular fine precipitates and more intergranular precipitates formed preferentially on prior austenite boundaries and martensite lath boundaries were found in JLS-2 than in JLF-1, martensite lath widths became narrower and dislocation density increased with the increase of tungsten content. Such microstructural features are likely to improve the creep properties by inhibiting grain evolution, microstructural recovery and strengthening grain boundaries at elevated temperatures.
机译：还原活化铁素体钢（RAF），JLF1（9Cr-2W-V，Ta钢）已被研究为IEA RAF R＆D活动的参考材料之一，因为它对高达100 dpa的高通量中子辐照具有优异的抵抗力。最近，已生产出JLS系列（9Cr-xW-V，Ta钢； x = 2.5、3.0和3.5）作为RAF的选件，可在先进的橡皮布系统中在较高温度下使用。在这个系列中，通过增加钨含量来改善高温机械性能。蠕变性能随钨含量的提高而提高。蠕变断裂试验后的微观结构检查显示出差异，钨含量从2.0（JLF-1）增加到3.0 wt％（JLS-2）。通过对试样（100 MPa，700℃）的检查，与JLF-1相比，在JLS-2中发现更多的颗粒内细小析出物和优先在先前奥氏体边界和马氏体板条边界上形成的更多的晶间析出物，马氏体板条宽度变窄随着钨含量的增加，位错密度增加。这种微结构特征可能会通过抑制晶粒演化，微结构恢复和在高温下强化晶界来改善蠕变性能。

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