Dual precipitation strengthening effect of copper and niobium in high strength steel weld metal

Ramirez, J. E.; Liu, S.; Olson, D. L.

doi:10.1016/0921-5093(96)10398-1

Cited by 10 publications

(1 citation statement)

References 3 publications

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“…With increasing copper content from 0.1 to 1.5 wt-%, the HSLA weld metals were strengthened by copper precipitation without compromising toughness. [14][15][16][17] Weld metal exhibits complex microstructures because of fast cooling from liquid and one (or multi) thermal cycling during deposition of subsequent passes. Copper precipitates are evolved during thermal cycle and affected by different peak temperature of thermal cycle.…”

Section: Introductionmentioning

confidence: 99%

Effects of evolution of nanoscale copper precipitation and copper content on mechanical properties of high-strength steel weld metal

Wang

Tong

Hou

et al. 2017

Science and Technology of Welding and Joining

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Nanoscale copper precipitation in high-strength weld metal was characterised by using atom probe tomography (APT) and transmission electron microscopy. In as-deposited zone, there was no copper precipitation. During welding thermal cycling, nanoscale copper of 2-3 nm in radius precipitated with face-centred cubic (FCC) and body-centred cubic (BCC) structure. During post-weld heat treatment (PWHT), FCC copper precipitate became coarsen and BCC transformed into FCC. The highest hardness was in the reheated zone which subjected to the peak temperature below 500°C; while the lowest hardness was both in deposited zone and the reheated zone which subjected to the peak temperature greater than 810°C. After PWHT, the hardness became homogenous as well as decreased. With increasing copper content, the hardness was increased and the toughness was slightly decreased. After PWHT, the toughness decreased due to the change in the structure of copper precipitates.

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Section: Introductionmentioning

confidence: 99%