期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 51, 期 12, 页码 6470-6481出版社
SPRINGER
DOI: 10.1007/s11661-020-06030-6
关键词
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资金
- Husqvarna AB
- European Union [686135]
- Royal Institute of Technology
A low-alloy medium-carbon bainitic steel was isothermally tempered at 300 degrees C for up to 24 hours which led to a significant hardness decrease. In order to explain the decreasing hardness, extensive microstructural characterization using scanning and transmission electron microscopy, X-ray diffraction, and atom probe tomography was conducted. The experimental work was further supplemented by thermodynamic and kinetic simulations. It is found that the main underlying reason for the hardness reduction during tempering is related to dislocation annihilation, possibly also with corresponding changes in Cottrell atmospheres. On the other hand, cementite precipitate size, effective grain size of the bainite, and retained austenite fraction appear unchanged over the whole tempering cycle.
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