A New Alloy System Having Autogenous Grain Pinning at High Temperature
This contribution proposes a new alloy in which a small volume fraction of austenite particles is used to pin ferrite grain growth at high temperatures. During the reheating process, when the temperature is higher than 1200 °C, the coarsening of austenite particles is driven by volume-diffusion-controlled behaviour and ferrite grain growth is dominated by the pinning effect of austenite particles. At low temperature (<1280 °C), grain growth occurred at a rate which is proportional to the particle coarsening rate; while at high temperature (>1280 °C), grain growth is much lower than that expected without pinning. During the solidification process, austenite particles nucleate along ferrite grain boundaries and retard grain growth. Grain growth can be completely arrested with more austenite particle precipitates. This new alloy can be applied to control grain coarsening in the thin slab casting direct rolling process, grain size control in the HAZ of welds and grain growth resistance at high temperature.
T. Zhou et al., "A New Alloy System Having Autogenous Grain Pinning at High Temperature," Materials Processing Fundamentals 2019, Springer Verlag, Feb 2019.
The definitive version is available at https://doi.org/10.1007/978-3-030-05728-2_7
The Minerals, Metals, & Materials Society 148th Annual Meeting and Exhibition, TMS 2019 (2019: Mar. 10-14, San Antonio, TX)
Materials Science and Engineering
Keywords and Phrases
High temperature; Particle coarsening; Particle pinning; Applications
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Article - Conference proceedings
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01 Feb 2019