Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 21, Issue 1, Pages 59-68Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/1362171815Y.0000000064
Keywords
Hardness map; Tensile and yield strengths; Microstructure; X52 microalloyed steel; Line pipe joints
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In this article, the variation of hardness in cross-section of X52 microalloyed steel joints before and after post-weld heat treatment and also the relationship of hardness with ultimate tensile strength, yield strength and microstructure have been investigated. For this purpose, the specimens were prepared in two conditions of as welded and post-weld heat treated, and the hardness maps of their cross-section were provided. Then, some equations were suggested to correlate the obtained hardness with the grain size and tensile and yield strengths. The equations made it possible to predict tensile and yield strengths with high accuracy. According to the results, the maximum hardness and strength belong to the weld junction. Normalisation of the joints at 950 degrees C reduced significantly the hardness difference (and also the strength difference) in various joint areas and homogenised the microstructure considerably. The grain size distribution was also modelled acceptably for the post-weld heat treated joint, and the grain size map was obtained.
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