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Evaluation of local...
Evaluation of local strength via microstructural quantification in a pearlitic rail steel deformed by simultaneous compression and torsion
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- Dimitrios, Nikas (författare)
- Chalmers University of Technology,Chalmers tekniska högskola
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- Zhang, Xiaodan (författare)
- Technical University of Denmark, DEN,Danmarks Tekniske Universitet
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- Ahlström, Johan, 1969 (författare)
- Chalmers University of Technology,Chalmers tekniska högskola
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(creator_code:org_t)
- Elsevier, 2018
- 2018
- Engelska.
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Ingår i: Materials Science & Engineering. - : Elsevier. - 0921-5093 .- 1873-4936. ; 737, s. 341-347
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Abstract
Ämnesord
Stäng
- Pearlitic steels are commonly used for railway rails because they combine good strength and wear properties. During service, the passage of trains results in large accumulation of shear strains in the surface layer of the rail, sometimes leading to crack initiation. Knowledge of the material properties versus the shear strain in this layer is therefore important for fatigue life predictions. In this study, fully pearlitic R260 rail steel was deformed using a bi-axial torsion-compression machine to reach different shear strains. Microstructural parameters including interlamellar spacing, thickness of ferrite and cementite lamellae and dislocation density in the ferrite lamellae, as well as hardness were quantitatively characterized at different shear strain levels. Based on the microstructural observations and the quantification of the microstructural parameters, the local flow stresses were estimated based on boundary strengthening and dislocation strengthening models. A good agreement was found between the estimated flow stresses and the flow stresses determined from microhardness measurements. d
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Teknisk mekanik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Applied Mechanics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Annan materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Other Materials Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)
Nyckelord
- Dislocation density
- Hardness
- Pearlitic rail steel
- Strengthening mechanisms
- TEM
- Carbides
- Ferrite
- Pearlite
- Plastic flow
- Rails
- Shear strain
- Torsional stress
- Transmission electron microscopy
- Dislocation densities
- Dislocation strengthening
- Micro-structural observations
- Microhardness measurement
- Microstructural parameters
- Microstructural quantifications
- Pearlitic rail steels
- Strengthening (metal)
- Materialteknik
- Materials Engineering
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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