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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 12
SUMMARY:Effect of rapid tempering on cementite morphology and hydrogen mobility in a medium-carbon, low-alloy advanced high strength steel 
DESCRIPTION:Abstract:
This study investigates the effect of rapid tempering and cementite morphology on hydrogen permeation and diffusion in a medium carbon steel. Three materials were tested: (1) direct-quenched, (2) direct-quenched and rapid tempered at 420°C, and (3) direct-quenched and rapid tempered at 720°C. The results showed that rapid tempering at 420°C and 720°C led to a significant decrease in the dislocation density of studied materials compared to the direct-quenched sample. In addition, higher tempering temperature resulted in a higher fraction of cementite precipitation as well as a change in the cementite morphology from the continuous stick-like structure to a more fragmented, discontinued, and globular type. Electrochemically hydrogen permeation tests revealed that direct-quenched samples could reach the saturation level much faster than the other two tempered samples and also had the lowest diffusion coefficient. It means less trapping site to be occupied but stronger to hinder the hydrogen mobility.  Direct-quenched and rapid tempered at 720 °C needed a relatively longer time to reach the saturation level but on the other hand, it showed the highest diffusion rate among all samples. Overall, this research highlights the morphology of cementite and dislocation density of the studied samples in the hydrogen permeation and diffusion properties which is very important when developing of hydrogen-resistant steels.

CLASS:PUBLIC
DTSTART:20230614T102000
DTEND:20230614T104000
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