The formation of eutectic phases and hot cracks in one Ni–Mo–Cr superalloy

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dc.contributor.authorLi, Jen_AU
dc.contributor.authorShrestha, SLen_AU
dc.contributor.authorLong, Yen_AU
dc.contributor.authorZhijun, Len_AU
dc.contributor.authorXintai, Zen_AU
dc.date.accessioned2019-09-03T07:25:48Zen_AU
dc.date.available2019-09-03T07:25:48Zen_AU
dc.date.issued2016-03-05en_AU
dc.date.statistics2019-12-01en_AU
dc.description.abstractThe structure and the formation mechanism of brittle eutectic phases and hot cracks formed at grain boundaries were investigated in two Ni-Mo-Cr superalloys with different silicon contents (0.06 and 0.46 wt.%). The eutectic phases and hot cracks can be observed along the rolling direction in the 0.46 wt.% Si heat when heated to 1335 °C or a higher peak temperature up to 1365 °C. Exposure to the higher peak temperatures resulted in the formation of larger eutectic phases and hot cracks in the higher silicon heat. Conversely, there are fewer eutectic phases and smaller hot cracks forming in the low-silicon heat when heated to 1365 °C. The eutectic phases were identified as γ-M6C′ type. Based on the constitutional liquation theory and thermodynamic calculations, it was found that the formation of the eutectic phases and hot cracks is due to the localized melting of primary M6C carbides and surrounding Si-riched matrix. The degree of elements segregation in liquid films determines whether liquid films solidify into eutectic phases or cause hot cracks. This model can reasonably explain the observed phenomena and contribute to designing appropriate solid-solution treatment process and welding procedure to avoid brittle phases and cracks in the Ni-Mo-Cr superalloy. © 2015 Elsevier B. V.en_AU
dc.identifier.citationLi, J., Shrestha, S. L., Long, Y., Zhijun, L., & Xintai, Z. (2016). The formation of eutectic phases and hot cracks in one Ni–Mo–Cr superalloy. Materials & Design, 93(5), 324-333. doi: 10.1016/j.matdes.2015.12.152en_AU
dc.identifier.govdoc9007en_AU
dc.identifier.issn0264-1275en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitleMaterials & Designen_AU
dc.identifier.pagination324-333en_AU
dc.identifier.urihttps://doi.org/10.1016/j.matdes.2015.12.152en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9067en_AU
dc.identifier.volume93en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectTemperature range 0400-1000 Ken_AU
dc.subjectThermodynamic modelen_AU
dc.subjectCarbidesen_AU
dc.subjectDiffusionen_AU
dc.subjectMolten salt reactorsen_AU
dc.subjectMetalsen_AU
dc.titleThe formation of eutectic phases and hot cracks in one Ni–Mo–Cr superalloyen_AU
dc.typeJournal Articleen_AU
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