Effect of solidification conditions on the solidification mode in austenitic stainless steels

Suutala, N.

doi:10.1007/bf02651615

Cited by 192 publications

(100 citation statements)

References 14 publications

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“…It was reported by Suutala [21] that when the ratio of Cr eq /Ni eq was lower than 1.35, solidification resulted in austenitic formation and when it was greater than 1.35, ferrite was formed. It was clearly understood that the Cr eq /Ni eq ratio was between 1.71 and 1.88 for all the weld metal.…”

Section: Influence Of Chemical Composition On Phase Fractions (Austenmentioning

confidence: 97%

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

2014

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Friction welding is a solid-state joining process which is applied extensively because of its advantages such as low heat input, efficient application, ease in manufacturing, and environmental friendliness. The present study investigates the mechanical and metallurgical properties of UNS S32205 duplex stainless steel frictionwelded joints. The process parameters, namely friction pressure, upsetting pressure, and rotational speed are individually varied from low level to high level (within the range of the machine setup) and their effects on the joint properties are analyzed. The partial-deformation zone had higher hardness than the weld and base metal. The toughness of the joints was evaluated at room temperature and at subzero temperature conditions. The impact toughness of the friction-welded joints was found to be superior to fusion-joined duplex stainless steel in room and cryogenic conditions.

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Section: Influence Of Chemical Composition On Phase Fractions (Austenmentioning

confidence: 97%

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

2014

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“…This increased velocity may lead to changes in solidification morphology, partitioning, and primary phase selections. [44][45][46][47][48][49] In welds, epitaxial solidification occurs from the heat-affected-zone, the nucleation of solid phase occurs readily.…”

Section: Rapidly Cooled Weld Microstructurementioning

confidence: 99%

Inclusion Formation and Microstructure Evolution in Low Alloy Steel Welds.

Babu

David

2002

ISIJ International

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The paper presents an overview of research performed at Oak Ridge National Laboratory on inclusion-formation, weld-solidification, and solid-state transformations in low-alloy steel welds. The competition between oxide and nitride formation in Fe-C-Al-Mn self-shielded flux-cored arc steel welds was predicted using computational thermodynamics. Nonequilibrium austenite phase selection was monitored in a Fe-CAl-Mn weld using an in situ time-resolved X-ray diffraction technique. The competition between acicular ferrite and bainite formation from austenite was evaluated in Fe-C-Mn steel welds containing small amounts of titanium.KEY WORDS: steel welds; inclusion formation; weld solidification; nonequilibrium phase transformations; bainite; acicular ferrite.

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“…[30][31][32] The values of G and R c depend markedly on the casting condition (superheat, mould materials, distance from mould wall to ingot, i.e. air-gap, etc.).…”

Section: Effect Of Solidification Pressure On Interfacial Heatmentioning

confidence: 99%

“…air-gap, etc.). 30) In practice, the effect of casting condition on structure is usually described by the cooling rate V s . calculated from the slope of cooling curve.…”

Section: Effect Of Solidification Pressure On Interfacial Heatmentioning

confidence: 99%

“…calculated from the slope of cooling curve. 30) Figure 2 shows the cooling curves of casting under 0.5 MPa. In the initial stage, there are a sharp rise and oscillations of temperature in the 2nd and 4th cooling curves, which are related to the thermocouple heating and turbulent liquid flow caused by the pouring.…”

Section: Effect Of Solidification Pressure On Interfacial Heatmentioning

confidence: 99%

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Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

Zhu

Wang

et al. 2018

ISIJ Int.

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The effect of solidification pressure (0.5, 0.85 and 1.2 MPa) on heat transfer between ingot and mould was investigated with the measurement of cooling curves and calculation of heat transfer coefficient. Combined with cooling rate, temperature gradient and local solidification time (LST), the influence of pressure on solidification structure of 19Cr14Mn0.9N was revealed by macrostructure observation. The calculation results of heat transfer coefficient, obtained by the Beck-Nonlinear estimation technique, indicate that increasing solidification pressure obviously enhances heat transfer at the ingot/mould interface. And higher solidification pressure is benefit to increase cooling rate and temperature gradient of ingot. Meanwhile, increasing solidification pressure considerably suppresses nitrogen gas pore, and reduces the whole area of dispersing porosity and shrinkage, which is favorable to obtain a sound ingot. With the solidification pressure increasing from 0.5 to 1.2 MPa, the columnar zone is lengthened, the columnar-toequiaxed transition (CET) position gradually moves to the ingot center, and both dendritic arm spacing (λ 1 and λ 2 ) and local solidification time (LST) gradually decrease. The solidification structure is significantly refined and compressed under higher solidification pressure.

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Effect of solidification conditions on the solidification mode in austenitic stainless steels

Cited by 192 publications

References 14 publications

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

Characterization of microstructure, toughness, and chemical composition of friction-welded joints of UNS S32205 duplex stainless steel

Inclusion Formation and Microstructure Evolution in Low Alloy Steel Welds.

Effect of Solidification Pressure on Interfacial Heat Transfer and Solidification Structure of 19Cr14Mn0.9N High Nitrogen Steel

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