Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 24, Pages 7417-7422Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.06.046
Keywords
Microstructure; Mechanical properties; X90 pipeline steel; Welding thermal cycle; Welding heat input; Coarse-grained heat affected zone
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Funding
- Sha-steel
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The effect of welding thermal cycle simulation on the microstructure and mechanical properties of X90 pipeline steel was investigated by means of microstructure analysis, tensile- and Charpy impact-tests. At the heat input of 15 kJ/cm, the microstructure of coarse-grained heat affected zone is mainly composed of lath bainite and granular bainite, resulting in excellent strength and toughness. At 25 kJ/cm with two thermal cycles, however, strength and impact toughness decrease due to the formation of more polygonal ferrite with coarser grains. (C) 2011 Elsevier B.V. All rights reserved.
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