Effect of forced cooling on the tensile properties and impact toughness of the coarse-grained heat-affected zone of a high-strength structural steel
Laitila, Juhani; Larkiola, Jari; Porter, David (2017-12-05)
Laitila, J., Larkiola, J. & Porter, D. Effect of forced cooling on the tensile properties and impact toughness of the coarse-grained heat-affected zone of a high-strength structural steel. Weld World 62, 79–85 (2018). https://doi.org/10.1007/s40194-017-0532-z
© International Institute of Welding 2017. This is a post-peer-review, pre-copyedit version of an article published in Welding in the World. The final authenticated version is available online at: https://doi.org/10.1007/s40194-017-0532-z
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe202101283026
Tiivistelmä
Abstract
The effects of forced cooling, i.e., forced cooling rate and forced cooling finish temperature, on the tensile and impact toughness properties of simulated weld coarse-grained heat-affected zones has been explored in the case of a low-carbon thermomechanically processed steel with a yield strength of 700 MPa. The forced cooling finish temperatures that were studied were 400, 300, 200, and 100 °C and the forced cooling rates were 50 and 15 °C/s. Coarse-grained heat-affected zones were simulated using a Gleeble 3800 thermomechanical simulator. For the steel concerned, strength and impact toughness improved significantly when the steel was cooled rapidly to 200 or 100 °C. The results indicate that it may be possible to substantially improve welding productivity by using forced cooling to reduce interpass times.
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