Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 53, Issue 4, Pages 1231-1243Publisher
SPRINGER
DOI: 10.1007/s11661-021-06584-z
Keywords
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Funding
- National Natural Science Foundation of China [51974184, 51574162]
- National MCF Energy R&D Program of China [2018YFE0306102]
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The precipitation behavior of kappa-carbides in a Fe-20Mn-9Al-1.2C-1.0V austenite based lightweight steel has been studied. Cold rolling before aging precipitation can promote the precipitation of kappa-carbides and accelerate the eutectoid transformation of austenite. V element is slightly enriched in the region of kappa-carbides and affects the nucleation barrier energy. After annealing, precipitated V-carbides induce the subsequent precipitation of kappa-carbides in the form of band distribution.
The precipitation behavior of kappa-carbides in a Fe-20Mn-9Al-1.2C-1.0V austenite based lightweight steel has been studied. V element is kept in solid solution by near-rapid solidification and precipitated as V-carbides by annealing, respectively. Aging treatments at temperatures of 500 degrees C to 600 degrees C were performed for the as-cast and cold-rolled steels. The results show that when the aging temperature is higher than 550 degrees C, intergranular kappa-carbides begin to appear along the austenite boundaries, and coarse kappa-carbides greatly reduce the ductility of the alloy. Cold rolling before aging precipitation can promote the precipitation of kappa-carbides and accelerate the eutectoid transformation of austenite. V element is slightly enriched in the region of kappa-carbides. First principles analysis shows that V segregation into kappa-carbides will increase the nucleation barrier energy. After annealing, precipitated V-carbides induce the subsequent precipitation of kappa-carbides in the form of band distribution, which is very different from the uniform precipitation without V-carbides.
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