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Anisotropy and microstructural evolutions of X70 pipeline steel during tensile deformation

Published online by Cambridge University Press:  26 June 2018

Qiuzhi Gao ,
Cheng Lu ,
Huijun Li ,
Jintao Li ,
Jian Han  and
Liang Chen
Qiuzhi Gao*
Affiliation:
School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, Hebei 066004, China; School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
Cheng Lu
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
Huijun Li*
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
Jintao Li
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
Jian Han
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
Liang Chen
Affiliation:
School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
*
a)Address all correspondence to these authors. e-mail: neuqgao@163.com
b)e-mail: huijun@uow.edu.au
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Abstract

Tensile properties of different directions of X70 pipeline steel plate were tested, and microstructural evolutions of different zones along the transverse direction (TD) were also investigated using electron backscatter diffraction. The highest strength values (yield strength and ultimate strength) appear at TD, and the diagonal direction shows the largest uniform elongation. The elongations of the polygonal ferrite and quasi polygonal ferrite grains increase with the decrease in the distance to the fracture zone. The ratio between high-angle grain boundaries and low-angle grain boundaries in the as-received steel is about 7/3 and starts to decrease from the fillet zone to the fracture zone. The refinement of grains occurs adjacent to the fracture section with the formation of subgrains. With the increase in tensile strain, the intensities of cube and γ-fiber textures increase sharply, and the reinforcement of the (111)$\left[ {\bar{1}\bar{1}2} \right]$ component was obviously larger than the (111)$\left[ {1\bar{2}1} \right]$ component in the γ-fiber texture during tensile deformation.

Keywords

X70 pipeline steeltensile propertiestexturemicrostructure
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3512 - 3520
Copyright
Copyright © Materials Research Society 2018 

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