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首页> 外文期刊>Journal of Korean Institute of Metal and Materials >Separation Phenomenon Occurring during Charpy Impact test of API X80 Linepipe Steels
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Separation Phenomenon Occurring during Charpy Impact test of API X80 Linepipe Steels

机译：API X80管线钢夏比冲击试验期间发生的分离现象

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摘要

In this study, microstructural investigation was conducted on the separation phenomenon occurring during Charpy impact tests of API X80 linepipe steels. Particular emphasis was placed on the role of microstructural phases present in the API X80 steels such as acicular ferrite, bainite, and hard secondary phases. Detailed microstructural analysis of fractured impact specimens showed that highly elongated bainite worked as prior initiation sites for separations, and that the number and length of separations increased with increasing volume fraction of bainite. In the steels having high work hardenability, tearing-shaped separations were found because the hammer-impacted region was seriously hardened during the impact test, which led to the reduction in the impact toughness. As the test temperature decreased, the tendency of separations increased, but separations were not observed when the cleavage fracture prevailed at very low temperatures. Thus, the minimization of the formation of bainite and secondary phases in the steels would be beneficial for preventing or minimizing separations because separations deteriorated low-temperature impact toughness.
机译：在这项研究中，对API X80管线钢的夏比冲击试验期间发生的分离现象进行了微结构研究。特别强调了API X80钢中存在的微观结构相的作用，例如针状铁素体，贝氏体和硬质第二相。断裂冲击试样的详细微观结构分析表明，高度伸长的贝氏体是先验的分离起点，并且随着贝氏体体积分数的增加，分离的次数和长度会增加。在具有高加工淬透性的钢中，发现撕裂状的分离，因为在冲击试验中锤击区域被严重硬化，导致冲击韧性降低。随着测试温度的降低，分离的趋势增加，但是当在非常低的温度下发生解理断裂时，没有观察到分离。因此，最小化钢中贝氏体和第二相的形成将有利于防止或最小化分离，因为分离会降低低温冲击韧性。

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