Effect of cooling rates on the weld heat affected zone coarse grain microstructure

Authors

  • Roman Celin Institute of metals and technology, Lepi pot 11, 1000 Ljubljana
  • Jaka Burja Institute of metals and technology, Lepi pot 11, 1000 Ljubljana

DOI:

https://doi.org/10.30544/342

Keywords:

cooling rate, microstructure, martensite, bainite

Abstract

The effect of a cooling rate on the S690Q quenched and tempered steel welded joint coarse grain heat affected zone microstructure was investigated using a dilatometer with controlled heating and cooling fixture. Steel samples were heated to a peak temperature of 1350 °C and cooled at the different cooling time Dt8/5. A dilatometric analysis and hardness measurements of the simulated thermal cycle coarse grain samples were done. Transformation start and finish temperature were determined using dilatation vs. temperature data analysis. The microstructure of the sample with a cooling time 5 s consists of martensite, whereas at cooling time 80 s a bainitic microstructure was observed. The investigated steel cooling cycle using simulation approach makes possible to determine the range of an optimum CG HAZ cooling time for the welding.

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How to Cite

Celin, Roman, and Jaka Burja. 2018. “Effect of Cooling Rates on the Weld Heat Affected Zone Coarse Grain Microstructure”. Metallurgical and Materials Engineering 24 (1):37-44. https://doi.org/10.30544/342.

Issue

Section

Technical papers