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Relationship between Creep Strength and Magnetic Properties of Cobalt-bearing High Chromium Ferritic Steel
ISIJ International ( IF 1.8 ) Pub Date : 2020-10-28 , DOI: 10.2355/isijinternational.isijint-2020-315
Shigeto Yamasaki 1 , Masatoshi Mitsuhara 1 , Hideharu Nakashima 1
Affiliation  

In this study, the relationship between changes in the magnetic properties and creep strength with the addition of 3 or 6 mass% Co was investigated for ferritic steel containing 15 mass% Cr. Co addition up to 6 mass% hardly contributed to solid solution strengthening or precipitation strengthening at room temperature. However, in the range of 650 to 750°C, the steel with the larger amount of Co exhibited higher creep strength, which is explained by a reduction in the diffusion rate associated with a change in magnetic properties by Co addition. An increase of the volume magnetization of the steel with increasing Co content in the range from room temperature to about 800°C was confirmed. Comparing the difference in volume magnetization and the ratio of the creep strain rate for steels with different amounts of Co, a clear correlation was found. That is, at the temperature at which the difference in volume magnetization reached a maximum, the peak of the creep strain rate ratio was also observed. This result is explained as follows. In a low temperature region where the magnetization is large or in a high temperature region above the Curie point of both steels, the steels exhibit no significant difference in the creep strength. However, at a temperature where one steel loses its ferromagnetism but the other steel retains it, a significant difference in the creep strength is observed.



中文翻译:

含钴高铬铁素体钢的蠕变强度与磁性能的关系

在本研究中,对于含15质量%Cr的铁素体钢,研究了添加3或6质量%Co的磁性和蠕变强度之间的关系。最多6质量%的Co添加对室温下的固溶强化或沉淀强化几乎没有贡献。但是,在650〜750℃的范围内,Co含量多的钢的蠕变强度高,这是由于伴随着添加Co而引起的磁特性的变化所引起的扩散速度的降低。在室温至约800℃的范围内,随着Co含量的增加,证实了钢的体积磁化强度的增加。比较具有不同Co含量的钢的体积磁化强度差异和蠕变应变率之比,可以得出明确的相关性。即,在体积磁化强度差达到最大的温度下,还观察到蠕变应变率比的峰值。该结果解释如下。在两种钢的磁化强度大的低温区域或高于居里点的高温区域中,这些钢的蠕变强度没有显着差异。但是,在一种钢失去铁磁性而另一种钢保留铁的温度下,观察到蠕变强度存在明显差异。在两种钢的磁化强度大的低温区域或高于居里点的高温区域中,这些钢的蠕变强度没有显着差异。然而,在一种钢失去铁磁性而另一种钢保留铁的温度下,观察到蠕变强度有显着差异。在两种钢的磁化强度大的低温区域或高于居里点的高温区域中,这些钢的蠕变强度没有显着差异。然而,在一种钢失去铁磁性而另一种钢保留铁的温度下,观察到蠕变强度有显着差异。

更新日期:2020-10-28
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