Please use this identifier to cite or link to this item: https://doi.org/10.1179/026708302225001633
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dc.titleMechanism of post-weld heat treatment cracking in Rene 80 nickel based superalloy
dc.contributor.authorLim, L.C.
dc.contributor.authorYi, J.-Z.
dc.contributor.authorLiu, N.
dc.contributor.authorMa, Q.
dc.date.accessioned2014-06-17T05:14:56Z
dc.date.available2014-06-17T05:14:56Z
dc.date.issued2002-04
dc.identifier.citationLim, L.C., Yi, J.-Z., Liu, N., Ma, Q. (2002-04). Mechanism of post-weld heat treatment cracking in Rene 80 nickel based superalloy. Materials Science and Technology 18 (4) : 407-412. ScholarBank@NUS Repository. https://doi.org/10.1179/026708302225001633
dc.identifier.issn02670836
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/58470
dc.description.abstractMicrostructural studies carried out on Rene 80 (approximate composition 60Ni-14Cr-9.5Co-4Mo-5Ti-3Al-0.17C-Zr-B, wt-%) weldments before and after post-weld heat treatment (PWHT) revealed abundant evidence of constitutionally liquated and resolidified grain boundaries extending from the mushy zone into the heat affected zone (HAZ). While total dissolution of γ′ occurred along such grain boundaries, a much lesser degree of γ′ dissolution was noted in the adjacent material. During the PWHT, a high density of γ′ precipitated out both within the mushy zone and in the constitutionally liquated and resolidified grain boundary regions in the HAZ. As the dissolution and reprecipitation of γ′ occurred fairly uniformly throughout the mushy zone, the ensuing aging contraction stress/ strain was fairly uniformly distributed in the region. In contrast, in the adjacent part of the HAZ, an extreme volume of γ′ precipitation occurred locally along the grain boundary regions, a result of the highest concentration of γ′ forming solutes and the complete dissolution of γ′ during welding in these regions. This, combined with the much stronger adjacent grain matrix, caused the aging contraction stress and strain to become highly concentrated along the grain boundary regions in the HAZ. This promoted the formation of PWHT cracks along such grain boundaries, which then propagated along the grain boundary into the mushy zone and beyond. © 2002 IoM Communications Ltd.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1179/026708302225001633
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentMECHANICAL ENGINEERING
dc.contributor.departmentMECHANICAL & PRODUCTION ENGINEERING
dc.description.doi10.1179/026708302225001633
dc.description.sourcetitleMaterials Science and Technology
dc.description.volume18
dc.description.issue4
dc.description.page407-412
dc.description.codenMSCTE
dc.identifier.isiut000175572900008
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