Effect of effective grain size and grain boundary of large misorientation on upper shelf energy in pipeline steels

Xiaoli Zhang; Zhiqiang Jiang; Shixian Li; Jiwei Fan

doi:10.1007/s11595-016-1417-5

Journal of Wuhan University of Technology Materials Science Edition ›› 2016, Vol. 31 ›› Issue (3) : 606 -610. DOI: 10.1007/s11595-016-1417-5

Metallic Materials

Effect of effective grain size and grain boundary of large misorientation on upper shelf energy in pipeline steels

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Abstract

X65, X70, and X80 belong to high grade pipeline steels. Toughness is one of the most important properties of pipeline steels when the pipeline transports the gas or oil, and the means to control toughness is very important for exploring even higher grade pipeline steels. We established the relationship between toughness and crystallographic parameters of high grade pipeline steels by studying the crystallographic parameters of X65, X70, and X80 using EBSD and analyzing Charpy CVN of X65, X70 and X80. The results show that the effective grain size, the frequency distribution of grain boundary misorientation and the ratio of high angle grain boundary to small angle grain boundary are important parameters. The finer the effective grain size, and the higher the frequency distribution of grain boundaries (≥ 50°), the more excellent toughness of high grade pipeline steels will be.

Keywords

high grade pipeline steels / effective grain size / grain boundary of large misorientation / upper shelf energy

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Xiaoli Zhang, Zhiqiang Jiang, Shixian Li, Jiwei Fan. Effect of effective grain size and grain boundary of large misorientation on upper shelf energy in pipeline steels. Journal of Wuhan University of Technology Materials Science Edition, 2016, 31(3): 606-610 DOI:10.1007/s11595-016-1417-5

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