Microstructural changes and strain hardening effects in abrasive contacts at different relative velocities and temperatures

Journal Article · Mon Aug 15 00:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.05.027· OSTI ID:22689589

Mozdzen, G. ^[1]; Weigel, F.; Varga, M. ^[2]

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1. Aerospace & Advanced Composites GmbH, Viktor-Kaplan-Straße 2F, 2700 Wiener Neustadt (Austria)
2. AC2T research GmbH, Viktor-Kaplan-Straße 2C, 2700 Wiener Neustadt (Austria)

Strain hardening is commonly used to reach the full potential of materials and can be beneficial in tribological contacts. 2-body abrasive wear was simulated in a scratch test, aimed at strain hardening effects in various steels. Different working conditions were examined at various temperatures and velocities. Strain hardening effects and microstructural changes were analysed with high resolution scanning electron microscopy (HRSEM), electron backscatter diffraction (EBSD), micro hardness measurements and nanoindentation. Statistical analysing was performed quantifying the influence of different parameters on microstructures. Results show a crucial influence of temperature and velocity on the strain hardening in tribological contacts. Increased velocity leads to higher deformed microstructures and higher increased surface hardness at a lower depth of the deformed zones at all materials investigated. An optimised surface hardness can be achieved knowing the influence of velocity (strain rate) and temperature for a “tailor-made” surface hardening in tribological systems aimed at increased wear resistance. - Highlights: •Hardening mechanisms and their intensity in tribological contacts are dependent on relative velocity and temperature. •Beneficial surface hardened zones are formed at certain running-in conditions; the scientific background is presented here. •Ferritic-pearlitic steels strain hardens via grain size reduction and decreasing interlamellar distances in pearlite. •Austenitic steels show excellent surface hardening (120% hardness increase) by twinning and martensitic transformation. •Ferritic steels with hard phases harden in the ferrite phase as per Hall-Petch equation and degree of deformation.

• OSTI ID: 22689589
• Journal Information: Materials Characterization, Vol. 118; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABRASIVES
AUSTENITIC STEELS
BACKSCATTERING
DEFORMATION
ELECTRON DIFFRACTION
FERRITE
FERRITIC STEELS
GRAIN SIZE
HARDNESS
MARTENSITIC STEELS
PHASE TRANSFORMATIONS
SCANNING ELECTRON MICROSCOPY
STRAIN HARDENING
STRAINS
SURFACE HARDENING
SURFACES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
VELOCITY
WEAR RESISTANCE