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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >Creep rupture ductility related to creep fracture mechanisms in 2.25Cr- 1Mo steel
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Creep rupture ductility related to creep fracture mechanisms in 2.25Cr- 1Mo steel

机译：与2.25Cr-1Mo钢的蠕变断裂机理有关的蠕变断裂延展性

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摘要

The long term creep rupture properties of 2.25Cr - 1Mo ferritic steel have been studied at eight temperatures between 723 and 923 K and the rupture lives varied in the range of 100 to 113 000 h. Three fracture mechanisms have been identified on the basis of microstructural investigations, namely transcrystalline, cavitation, and recrystallisation. A transcrystalline fracture mode was observed at most of the test temperatures and often up to medium term rupture lives. A transition from transcrystalline fracture mode to cavitation mode was observed at very long rupture lives, whereas a transition to recrystallisation fracture mode was observed at the highest test temperatures. The Variation of reduction in cross-sectional area of the sample at fracture, with the Larson - Miller parameter, has been found to reflect the transitions in fracture behaviour. Changes in the density of the material due to creep deformation were measured and found to exhibit a close correlation with reduction in cross-sectional area.
机译：在723至923 K之间的八个温度下研究了2.25Cr-1Mo铁素体钢的长期蠕变断裂特性，断裂寿命在100至113 000 h范围内变化。在微观结构研究的基础上，已经确定了三种断裂机理，即跨晶，气蚀和重结晶。在大多数测试温度下都观察到了跨晶断裂模式，通常直至中期断裂寿命。在极长的断裂寿命中观察到了从跨晶断裂模式到空化模式的转变，而在最高测试温度下观察到了向再结晶断裂模式的转变。发现具有Larson-Miller参数的断裂时样品横截面积减小的变化反映了断裂行为的转变。测量了由于蠕变变形引起的材料密度的变化，发现该变化与截面积的减小密切相关。

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