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

Rojacz, H.; Mozdzen, G.; Weigel, F.; Varga, M.

doi:10.1016/j.matchar.2016.05.027

Cited by 29 publications

(12 citation statements)

References 40 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At a more macroscopic view, the grain size has a crucial influence on the deformation behavior of materials; besides slipping of atoms as the main nanoscopic deformation mechanism, we find strong dependence on the Hall–Petch relation (grain size effect) and present micro‐ and nanostructural phases . Furthermore, temperature effects on microstructural and nanostructural changes that influence deformation cannot be neglected, as they lead to changes in macroscopical deformation mechanisms, and therefore also in the mechanical properties of materials …”

Section: Discussionmentioning

confidence: 85%

Influence of Momentum and Energy on Materials: An Experimental and Molecular Dynamics Approach for Impact Phenomena

Winkelmann

Rojacz

Eder

et al. 2017

steel research int.

View full text Add to dashboard Cite

Single-impact tests and molecular dynamics (MD) simulations are performed to evaluate effects at energy-and momentum-variable impact phenomena at two distinct scales and velocity ranges. Therefore, a carbon steel in various heat treatment conditions is examined using the single impact test to evaluate the influence of varying energies and momenta on the deformation behavior. Experimentally found material parameters "momentumsensitivity"p s ðEÞ and "minimum deformation momentum"p 0 ðEÞare introduced for a better mathematical description of impact phenomena or deformation processes using energy and momentum. Empirical laws are found, where the minimum deformation momentum is a linear function of the impact energy (E) and the deformation at low momenta is an inverse function of E, which has significant influence on the deformation. The proposed empirical law are recalculated via down-scaled molecular dynamics simulation (rigid indenter impacting on an iron block) and is found applicable for macro and nano scale impact phenomena.

show abstract

Section: Discussionmentioning

confidence: 85%

Influence of Momentum and Energy on Materials: An Experimental and Molecular Dynamics Approach for Impact Phenomena

Winkelmann

Rojacz

Eder

et al. 2017

steel research int.

View full text Add to dashboard Cite

show abstract

“…Material C (Figure c), a heat‐ and chemical‐resistant steel, shows austenitic microstructure with an average grain size of ≈22 μm. Material D (Figure d), a Cr‐alloyed and heat‐resistant steel with ferritic matrix, contains primary Cr‐carbides of Cr 7 C 3 structure . Black dots visible on Figure d are mostly oxide inclusions formed during the casting process.…”

Section: Resultsmentioning

confidence: 99%

High Temperature Corrosive Environment in a Sintering Plant for Pig Iron Production and Its Effect on Different Steel Grades

Rojacz

Krabáč

Varga

et al. 2017

steel research int.

View full text Add to dashboard Cite

The harsh environment in a sintering plant for pig iron production leads to high temperature corrosion of the sinter grates. In the present study, a detailed analysis of the corrosives in such applications is given to understand materials failure. Various steels are tested, revealing effects of various alloying concepts, the resulting phases and their corrosive behavior in this complex corrosive environment at %900 8C. In order to understand the underlying corrosion mechanisms, detailed analyses are performed. Results indicate mainly chlorine, sulfur, and oxidation based corrosive decay at elevated temperature and a high relevance of protecting alloying elements within the steels.

show abstract

“…Further than 15-20 μm from the surface, no deformation process can be identified based on the acquired images. To gain a deeper insight into the ongoing deformation processes, the authors are currently carrying out further analyses, including EBSD measurements, which are suitable for describing structural material changes in tribologically affected zones to elucidate deformation with inverse pole figures (shearing) and misorientation plots, representing the local degree of deformation [58,59].…”

Section: Validation By Comparison With Experimentsmentioning

confidence: 99%

Experimentally validated atomistic simulation of the effect of relevant grinding parameters on work piece topography, internal stresses, and microstructure

et al. 2021

Self Cite

View full text Add to dashboard Cite

In this work, we present a fully atomistic approach to modeling a finishing process with the goal to shed light on aspects of work piece development on the microscopic scale, which are difficult or even impossible to observe in experiments, but highly relevant for the resulting material behavior. In a large-scale simulative parametric study, we varied four of the most relevant grinding parameters: The work piece material, the abrasive shape, the temperature, and the infeed depth. In order to validate our model, we compared the normalized surface roughness, the power spectral densities, the steady-state contact stresses, and the microstructure with proportionally scaled macroscopic experimental results. Although the grain sizes vary by a factor of more than 1,000 between experiment and simulation, the characteristic process parameters were reasonably reproduced, to some extent even allowing predictions of surface quality degradation due to tool wear. Using the experimentally validated model, we studied time-resolved stress profiles within the ferrite/steel work piece as well as maps of the microstructural changes occurring in the near-surface regions. We found that blunt abrasives combined with elevated temperatures have the greatest and most complex impact on near-surface microstructure and stresses, as multiple processes are in mutual competition here.

show abstract

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

Cited by 29 publications

References 40 publications

Influence of Momentum and Energy on Materials: An Experimental and Molecular Dynamics Approach for Impact Phenomena

Influence of Momentum and Energy on Materials: An Experimental and Molecular Dynamics Approach for Impact Phenomena

High Temperature Corrosive Environment in a Sintering Plant for Pig Iron Production and Its Effect on Different Steel Grades

Experimentally validated atomistic simulation of the effect of relevant grinding parameters on work piece topography, internal stresses, and microstructure

Contact Info

Product

Resources

About