The influence of the ferrite to austenite transformation on the formation of sulfidesx

Fredriksson, Hasse; Stjerndahl, J.

doi:10.1007/bf02667396

Cited by 13 publications

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“…It has been found that the morphology of the inclusions strongly depends on the composition of the melt and on the cooling rates used . The overall precipitation or crystallization processes for the formation of MnS in steels are not fully understood yet.…”

Section: Introductionmentioning

confidence: 99%

“…The overall precipitation or crystallization processes for the formation of MnS in steels are not fully understood yet. For the formation of types I and II sulfides monotectic and eutectic reactions have been proposed whereas other researchers supported the idea of the crystallization of type II MnS due to a eutectic reaction but assigned the formation of types I and III to a precipitation from solid steel during cooling . Sometimes, types I and III, as well as dendritic shapes, were also denoted as the primary phase (in ref .…”

Section: Introductionmentioning

confidence: 99%

“…The precipitation process is also influenced by the phase transformations that occur during cooling. The δ/γ and especially the γ/α transformation play an important role because of differences in the solubility of the alloying elements and a change in diffusivity (e.g., Mn‐diffusion is 100 times faster in α‐ than in γ‐iron and S diffuses three to five times faster in comparison) …”

Section: Introductionmentioning

confidence: 99%

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Dynamic, In Situ Generated Interfaces Between Carbon‐Bonded Alumina Filters and Steel During Spark Plasma Sintering/Field‐Assisted Sintering

et al. 2013

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The aim of this study was to analyze possible reactions taking place during filtration of steel melts. The heterogeneous reactions and interface creation during short-time contact of liquid steel and newly developed carbon bonded alumina ceramic filter (Al 2 O 3 -C) were examined. The samples were produced using spark plasma sintering (SPS) to assure the absence of liquid convection. The production of the samples included very high heating rates of up to 1000 K min À1 , short holding times just above liquidus temperature and a rapid cooling. The focus of the research was put on the inorganic inclusions (endogenous as well as exogenous), agglomerates, and phase formation. Exogenous inclusions (Al 2 O 3 ) were added to the steel grade 42CrMo4 by a ball milling process. The results indicate the formation of MnS inclusions due to the high sulfur content in the used steel. The formation took place at the interfaces between steel and ceramic and at the grain boundaries within the steel. Penetration of the porous ceramic body by the steel was identified. Exogenous Al 2 O 3 inclusions were found to agglomerate, adhere at the steel/Al 2 O 3 -C interfaces and tended to float on top of the melt.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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