Influences of microstructure and texture on crack propagation path of X70 acicular ferrite pipeline steel

Hao Yu

doi:10.1016/S1005-8850(08)60271-6

Volume 15 Issue 6

Dec. 2008

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International Journal of Minerals, Metallurgy and Materials > 2008 > 15(6): 683-687. > DOI: 10.1016/S1005-8850(08)60271-6

Hao Yu, Influences of microstructure and texture on crack propagation path of X70 acicular ferrite pipeline steel, J. Univ. Sci. Technol. Beijing , 15(2008), No. 6, pp.683-687. https://dx.doi.org/10.1016/S1005-8850(08)60271-6

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Materials

Influences of microstructure and texture on crack propagation path of X70 acicular ferrite pipeline steel

Hao Yu^,

Author Affilications

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

Received: 18 December 2007; Available Online: 13 June 2021

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Abstract

Abstract

The aspects of two pipeline steels with different technologies were investigated by using transmission electron microscopy (TEM) and electron back-scattered diffraction (EBSD). The microstructure presents a typical acicular ferrite characteristic with fine particles of martensite/austenite (M/A) constituent, which distributes in grains and at grain boundaries. The bulk textures of the pipeline steel plate are {112}<110> and <111> fibers, respectively, and the {112}<110> component is the favorable texture benefiting for drop weight tear test. Moreover, low angle boundaries and low coincidence site lattice boundaries are inactive and more resistant to fracture than high energy random boundaries.
- pipeline steel,
- acicular ferrite,
- microstructure,
- texture,
- crack propagation

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