Postweld Heat Treatment on Toughness of Electric- Resistance Welded X70 Steel
- University of Alberta, Edmonton, AB (Canada)
- Indian Institute of Technology (IIT), Jodhpur (India)
- Oak Forensic Engineering Ltd., Calgary (Canada)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Evraz Inc. NA, Regina (Canada)
In this report the effect of postweld heat treatment (PWHT) on Charpy V-notch impact toughness of a highfrequency electric-resistance welded (HF-ERW) grade X70 pipeline steel is investigated. PWHT thermal cycles are simulated using the Gleeble on the as-welded specimens. Microstructure, along with crystallographic texture and microhardness, is characterized in specimens that are impact tested at –5°C (23°F), –30°C (–22°F), and –45°C (–49°F). The impact toughness values show a wide scatter band and decrease with the increasing peak temperature of the PWHT. For higher peak temperatures, the microstructure of the heat-affected zone (HAZ) gradually changed from equiaxed ferrite to bainitic ferrite. Furthermore, the prior austenite grain size (PAGS) increases with the increasing peak temperature. The density of high-angle grain boundaries decreases, and the fraction of cleavage planes {100} parallel to the impact fracture plane increases for higher peak temperatures of the PWHT
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Natural Sciences and Engineering Research Council (NSERC); USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 2351009
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 07 Vol. 103; ISSN 0043-2296
- Publisher:
- American Welding SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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