Abstract
The effect of postweld heat treatment (PWHT) on Charpy V-notch impact toughness of a high-frequency 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.
| Original language | English |
|---|---|
| Pages (from-to) | 187-202 |
| Number of pages | 16 |
| Journal | Welding Journal |
| Volume | 103 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2024 |
Funding
The authors acknowledge the support of the Natural Sciences and Engineering Research Council (NSERC) of Canada through the Collaborative Research and Development (CRD) grant and Mitacs through the Accelerate program.
Keywords
- ERW
- Impact Toughness
- Microstructure
- Postweld Heat Treatment
- X70 Steel
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