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Metals and Materials International
Published in: Metals and Materials International 6/2018

02-08-2018

Effect of Strain Aging on Tensile Behavior and Properties of API X60, X70, and X80 Pipeline Steels

Authors: Sang-In Lee, Seung-Yong Lee, Seok Gyu Lee, Hwan Gyo Jung, Byoungchul Hwang

Published in: Metals and Materials International | Issue 6/2018

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Abstract

The effect of strain aging on tensile behavior and properties of API X60, X70, and X80 pipeline steels was investigated in this study. The API X60, X70, and X80 pipeline steels were fabricated by varying alloying elements and thermomechanical processing conditions. Although all the steels exhibited complex microstructure consisting of polygonal ferrite (PF), acicular ferrite, granular bainite (GB), bainitic ferrite (BF), and secondary phases, they had different fractions of microstructures depending on the alloying elements and thermomechanical processing conditions. The tensile test results revealed that yielding behavior steadily changed from continuous-type to discontinuous-type as aging temperature increases after 1% pre-strain. After pre-strain and thermal aging treatment in all the steels, the yield and tensile strengths, and yield ratio were increased, while the uniform elongation and work hardening exponent were decreased. In the case of the X80 steel, particularly, the decrease in uniform elongation was relatively small due to many mobile dislocations in PF, and the increase in yield ratio was the lowest because a large amount of harder microstructures such as GB, BF, and coarse secondary phases effectively enhanced work hardening.
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Metadata
Title
Effect of Strain Aging on Tensile Behavior and Properties of API X60, X70, and X80 Pipeline Steels
Authors
Sang-In Lee
Seung-Yong Lee
Seok Gyu Lee
Hwan Gyo Jung
Byoungchul Hwang
Publication date
02-08-2018
Publisher
The Korean Institute of Metals and Materials
Published in
Metals and Materials International / Issue 6/2018
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-018-0173-9

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