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Ironmaking & Steelmaking
Processes, Products and Applications
Volume 48, 2021 - Issue 4
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Research Articles

Effects of Al addition on austenite grain growth, submicrometre and nanometre particles in heat-affected zone of steel plates with Mg deoxidation

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Pages 417-427 | Received 06 Jun 2020, Accepted 13 Jul 2020, Published online: 17 Aug 2020
 

ABSTRACT

The effects of Al addition on austenite grain growth and particle characterization in heat-affected zone during high-heat-input welding for Mg- deoxidized steel plates without Al (0Al) and with 0.02wt-% Al (200Al) were studied. Austenite grains grow intensively in 1300–1400 °C and TiN particles play the role on inhibiting grain growth. The number density and average size of submicron and nanometer particles decreases and increases, respectively with Al addition. There are critical dissolved particle sizes of 1.84, 3.18 and 11.64 nm at 1300, 1350 and 1400 °C, respectively. The dissolution of nanoparticles in 0Al larger than that in 200Al causes the faster reduction rate of pinning force and greater increase of grain growth rate in 0Al. The effect of submicron particle coarsening on austenite grain growth is non-obvious because the amount of submicron particles is less than that of nanoparticles and the submicron particle coarsening is a comparatively slow process.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors gratefully acknowledge the financial support from the Natural Science Foundation of China [grant number U1960202], the Science and Technology Commission of Shanghai Municipality [grant number 19DZ2270200] and the Opening Foundation from Shanghai Engineering Research Center of Hot Manufacturing [grant number 18DZ2253400].

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