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<p>Dilatometry was used to generate continuous cooling transformation (CCT) diagrams for two different L485ME pipeline steels for hydrogen transportation. One material originated from an in-service pipeline, while the other, newer material was taken from plate material. To generate the CCT diagrams, specimens were heated up to peak temperatures of 1250°C using dilatometry to generate coarse-grained microstructure and subsequently cooled with <i>t</i><sub>8/5</sub> cooling times varying from 2 to 500 s. In addition, heat-affected zone (HAZ) subregions were thermophysically simulated using peak temperatures between 700 and 1250°C at <i>t</i><sub>8/5</sub> cooling times of 6 s and 15 s. The newer plate material exhibited hardening across the entire investigated HAZ region, whereas the in-service material showed significant hardening only at peak temperatures above 1100°C (15 s) and 1000°C (6 s). These findings provide a basis for understanding the influence of cooling conditions on microstructural evolution and hardness in pipeline steels relevant to hydrogen transport applications.</p>

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Thermophysically simulated weld HAZ and CCT diagram of high strength low alloy pipeline steels

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月2日

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  • G. Fey,
  • A. Kromm,
  • T. Kannengiesser

摘要

Dilatometry was used to generate continuous cooling transformation (CCT) diagrams for two different L485ME pipeline steels for hydrogen transportation. One material originated from an in-service pipeline, while the other, newer material was taken from plate material. To generate the CCT diagrams, specimens were heated up to peak temperatures of 1250°C using dilatometry to generate coarse-grained microstructure and subsequently cooled with t8/5 cooling times varying from 2 to 500 s. In addition, heat-affected zone (HAZ) subregions were thermophysically simulated using peak temperatures between 700 and 1250°C at t8/5 cooling times of 6 s and 15 s. The newer plate material exhibited hardening across the entire investigated HAZ region, whereas the in-service material showed significant hardening only at peak temperatures above 1100°C (15 s) and 1000°C (6 s). These findings provide a basis for understanding the influence of cooling conditions on microstructural evolution and hardness in pipeline steels relevant to hydrogen transport applications.