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- W3198419054 abstract "• Limited effect of temerping at 400 and 500°C on non-ausformed crabide-free bainite. • Dilatometric contraction occurred for ausformed bainite sample due to cementite precipitation. • Carbon diffusion was enhanced by dislocations generated during ausforming processes. The influence of tempering at 400 and 500 °C on two bainitic ferrite microstructures obtained via pure isothermal transformation and ausforming followed by the isothermal transformation was studied in a medium C-Si rich bainitic steel. To understand the dilatometric behaviour and mechanisms of carbide-free bainite decomposition, extensive microstructural characterization using scanning electron microscopy, X-ray diffraction, and microhardness measurements were conducted. The softening due to tempering at 400 °C was negligible for both microstructures. Tempering at 500 °C led to a remarkable contraction in dilatometric signal in an ausformed sample, while a pure isothermal sample showed slight contraction. The main mechanism governing microstructural changes during tempering at 500 °C was the decomposition of as-ausformed highly dislocated bainitic ferrite plates and/or film-like retained austenite into cementite and ferrite as a result of enhanced carbon diffusion. While tempering at 400 °C did not result in changes in the size of the bainitic plates, the higher tempering temperature of 500 °C led to a thickening of the bainitic ferrite plates for both testing conditions. However, the thickening was restricted in the ausformed bainite, which was related to the pinning effect of very small cementite precipitates, which moderate the tempering effects on hardness reduction." @default.
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- W3198419054 date "2021-11-01" @default.
- W3198419054 modified "2023-10-17" @default.
- W3198419054 title "Microstructural evolution during tempering of an ausformed carbide-free low temperature bainitic steel" @default.
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- W3198419054 doi "https://doi.org/10.1016/j.matdes.2021.110082" @default.
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