Effect of chemical banding on the local hardenability in AISI 4340 steel bar

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dc.contributor.authorPenha R.N.
dc.contributor.authorVatavuk J.
dc.contributor.authorCouto A.A.
dc.contributor.authorPereira S.A.D.L.
dc.contributor.authorde Sousa S.A.
dc.contributor.authorCanale L.D.C.F.
dc.date.accessioned2024-03-13T00:56:59Z
dc.date.available2024-03-13T00:56:59Z
dc.date.issued2015
dc.description.abstract© 2015 Elsevier Ltd.The microstructure of a 240. mm diameter AISI 4340 mill shaft, quenched and tempered, was analyzed through its longitudinal cross section. Normally, higher cooling rates promote martensitic structure while the diffusion assisted austenite decomposition products are expected in the lower cooling rate condition. The martensitic reaction takes place inside the grains while the products diffusion starts from the prior austenite grain boundaries, nucleation and grow processes. An anomalous hardenability behavior was reported with a mixed structure containing martensite and bainite, in different proportion from the surface (higher cooling rate) to the core (lower cooling rate). This behavior was attributed to the wide banded structure. Banding due to the as cast structure segregation, is directly related to the solidification rate as well as the deformation degree due (during) to forging and rolling operations. When the deformation degree is high, the banding thickness is thin and approaches the austenite grain size. In this study the thickness of the bands embedded about four to five austenite grain sizes, in such a way that every band behaves like a particular steel composition. A semi quantitative chemical analysis was carried out through the banded structure to understand the differential hardenability behavior. The results were discussed using classical hardenability formula as well as calculated TTT diagrams for each composition.
dc.description.firstpage59
dc.description.lastpage68
dc.description.volume53
dc.identifier.doi10.1016/j.engfailanal.2015.03.024
dc.identifier.issn1350-6307
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36186
dc.relation.ispartofEngineering Failure Analysis
dc.rightsAcesso Restrito
dc.subject.otherlanguageChemical banding
dc.subject.otherlanguageHardenability
dc.subject.otherlanguageQuenching and tempering
dc.titleEffect of chemical banding on the local hardenability in AISI 4340 steel bar
dc.typeArtigo
local.scopus.citations17
local.scopus.eid2-s2.0-84927556616
local.scopus.subjectAustenite decomposition
local.scopus.subjectDifferent proportions
local.scopus.subjectHardenability
local.scopus.subjectMartensitic reactions
local.scopus.subjectMartensitic structures
local.scopus.subjectPrior austenite grain boundaries
local.scopus.subjectQuantitative chemical analysis
local.scopus.subjectQuenching and tempering
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84927556616&origin=inward
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