On Volume changes during the solidification of peritectic steel
(English)Manuscript (preprint) (Other academic) [Artistic work]
The volume change during the solidification of an industrial high nickel peritectic steel was studied by using Linear Variable Differential Transformers (LVDT). The effects of the different primary phase precipitation on the volume change were studied by modifying the molten metal with Ti. The addition of Ti varies from 0.13, 0.15 and 0.25 wt-%. The microstructures of the final casting also went through an Optical Microscopy analysis to assess the differences between different samples. The displacement change measurement shows that the peritectic steel expands or contracts during the solidification. The primary austenite (γ) precipitation during the solidification in the metastable region is accompanied by gradual expansion on the casting sides. Primary δ-ferrite precipitation under stable phase diagram complemented by a severe contraction in the solidification region. The microstructural analysis reveals that the only difference between the samples is grain refinement with the Ti addition. Moreover, the severe contraction in the solidification region might be the source for the crack formation, and further theoretical analysis is required in the future to verify the observations.
Volume changing; Peritectic steel; LVDT; Austenite; Metastable; delta-ferrite
Metallurgy and Metallic Materials
Research subject Materials Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-202555OAI: oai:DiVA.org:kth-202555DiVA: diva2:1077420
QC 201702282017-02-272017-02-272017-03-03Bibliographically approved