Solidification and microstructure of a high alloy stainless steel |
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Authors: | Zi-Kui Liu Donald Pile Jan-Olof Andersson Anders Brorson |
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Affiliation: | (1) Division of Physical Metallurgy, Royal Institute of Technology, S-100 44 Stockholm, Sweden;(2) Avesta Sheffield Research and Development, S-774 80 Avesta, Sweden |
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Abstract: | The steel considered in the present work can be classified as a 6Mo austenitic stainless steel, which has a much higher corrosion
resistance than many other commercially available stainless steels. However, because of macrosegregation during solidification
of ingot casting, the high alloy content in the steel, especially Mo, N, C, enhances precipitation of intermetallic phases
such asa phase. Such precipitation mainly occurs in the center of the material and has normally no significant effect on mechanical
properties or surface corrosion resistance. The introduction of modern production methods such as continuous casting of slabs
for stainless sheet production has reduced the macrosegregation tendency and related precipitation. However, the microsegregation
in a small scale may be enhanced as the higher cooling rate prevents the diffusion in the solidified region. In the present
work, the continuous casting solidification process was simulated in a laboratory gradient |
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