Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging

Sang-in Lee, Byoungchul Hwang

钢铁研究学报(英文版) ›› 2020, Vol. 27 ›› Issue (3) : 319-324.

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钢铁研究学报(英文版) ›› 2020, Vol. 27 ›› Issue (3) : 319-324. DOI: 10.1007/s42243-019-00313-y
论著

Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging

  • Sang-in Lee1, Byoungchul Hwang1
作者信息 +

Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging

  • Sang-in Lee1, Byoungchul Hwang1
Author information +
文章历史 +

摘要

Variations in tensile behavior and properties after pre-strain and thermal aging were differently affected by strain aging phenomenon dependent on microstructure. With increasing polygonal ferrite fraction, decrement in uniform elongation is increased, and the increment in yield-to-tensile ratio is slightly decreased after pre-strain and thermal aging. Therefore, it can be concluded that the polygonal ferrite has contradictory effects on strain aging resistance although the polygonal ferrite still contributes to improvement of uniform elongation after strain aging.

Abstract

Variations in tensile behavior and properties after pre-strain and thermal aging were differently affected by strain aging phenomenon dependent on microstructure. With increasing polygonal ferrite fraction, decrement in uniform elongation is increased, and the increment in yield-to-tensile ratio is slightly decreased after pre-strain and thermal aging. Therefore, it can be concluded that the polygonal ferrite has contradictory effects on strain aging resistance although the polygonal ferrite still contributes to improvement of uniform elongation after strain aging.

关键词

Steel / Microstructure / Strain aging / Deformability / Pipeline

Key words

Microstructure / Pipeline / Strain aging / Steel / Deformability

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Byoungchul Hwang, Sang-in Lee. Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging[J]. 钢铁研究学报(英文版), 2020, 27(3): 319-324 https://doi.org/10.1007/s42243-019-00313-y
Byoungchul Hwang, Sang-in Lee. Correlation of microstructure with tensile behavior and properties of API X70 pipeline steels subjected to strain aging[J]. Journal of Iron and Steel Research International, 2020, 27(3): 319-324 https://doi.org/10.1007/s42243-019-00313-y

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