Effects of precipitates and inclusions on the fracture toughness of hot rolling X70 pipeline steel plates

Mai-wen Zhou; Hao Yu

doi:10.1007/s12613-012-0632-0

Volume 19 Issue 9

Sep. 2012

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文章导航 > 矿物冶金与材料学报（英文版） > 2012 > 19(9) : 805-811. > DOI: 10.1007/s12613-012-0632-0

Cite this article as:

Mai-wen Zhou, and Hao Yu, Effects of precipitates and inclusions on the fracture toughness of hot rolling X70 pipeline steel plates, Int. J. Miner. Metall. Mater., 19(2012), No. 9, pp.805-811. https://dx.doi.org/10.1007/s12613-012-0632-0

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Effects of precipitates and inclusions on the fracture toughness of hot rolling X70 pipeline steel plates

Mai-wen Zhou^,,
Hao Yu

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

通信作者:
Mai-wen Zhou E-mail: zmwen1985@163.com

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中文摘要

In order to investigate the fracture toughness, crack tip opening displacement (CTOD) experiments were conducted on two X70 pipeline steel plates with different rolling processes. After the experiments, optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to observe the microstructure and fracture morphology. The effects of precipitates on the fracture toughness and the crack initiation mechanism induced by inclusions were analyzed. The CTOD result shows that the steel with a lower finishing cooling temperature has a higher fracture toughness. Inclusions with different shapes and two kinds of precipitates with different sizes were observed. It can be concluded that precipitates with different sizes have different effects and mechanisms on the fracture toughness. Distinguished from the earlier researches, inclusions enriched in silicon can be also served as the crack initiation.

关键词:

Effects of precipitates and inclusions on the fracture toughness of hot rolling X70 pipeline steel plates

Mai-wen Zhou^,,
Hao Yu

Author Affilications

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received: 09 October 2011; Revised: 15 November 2011; Accepted: 24 November 2011;

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Citing articles(19)

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