Scratch hardness and wear performance of laser-melted steels: Effects of anisotropy

Beurs, H. de; Minholts, G.; Hosson, J.Th.M. De

doi:10.1016/0043-1648(89)90203-2

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…16 The hardness values, as defined above, obtained from scratch and indentation tests vary widely; indentation-to-scratch hardness ratios range from 0.6 to 1.4. De Beurs et al 23 performed scratch tests on laser-melted steels using a Vickers indenter. They found experimentally that the ratio of the Vickers indentation hardness to the scratch hardness was 0.77.…”

Section: Introductionmentioning

confidence: 99%

Determination of hardness from nanoscratch experiments: Corrections for interfacial shear stress and elastic recovery

2003

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A frequent application of the nanoscratch technique is to estimate hardness of ultrathin films when substrate effects are encountered with the nanoindentation technique. A model based on the work of Goddard and Wilman, which assumes a rigid-plastic behavior of the deformed surfaces, is commonly used for the determination of hardness from scratch tests, yet it overestimates the hardness of materials by as much as a factor of three at very shallow indentation depths on the order of 1-10 nm. The Goddard and Wilman model was extended in this paper to include the effects of the component of the shear stress tangential to the meridianal plane and the elastic recovery of the plastically deformed surfaces assuming elastic-perfectly-plastic material behavior. The proposed model was subsequently verified by performing nanoscratch experiments on fused quartz, which is homogeneous and isotropic with no known surface layers and with known hardness. The hardness was calculated using both the model based on the work of Goddard and Wilman and the extended model. The hardness calculated using the extended model was in very close agreement with the accepted value of bulk hardness of fused quartz over the range of scratch depths tested, showing the importance of the effects of elastic recovery and interfacial shear stress. The model was further verified for the case of a pure aluminum sample and the native thin film coating of alumina that forms on the surface upon air exposure.

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Section: Introductionmentioning

confidence: 99%

Determination of hardness from nanoscratch experiments: Corrections for interfacial shear stress and elastic recovery

2003

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“…The hardness of difwas part of a project in which the abrasive wear ferent phases can be determined by making one resistance of POM as a function of the material's single scratch. 1 Hence, hardness differences bemicrostructure was of particular interest. In order tween different morphological regions of POM (as to get a basic idea about the active abrasive wear a result of different thermal histories) should be mechanisms, single scratch tests were carried out detectable.…”

Section: Rin Of Dupont) a Thermoplastic Material Ismentioning

confidence: 99%

Scratch and indentation tests on polyoxymethylene (POM)

Pistor

Friedrich

1997

J. Appl. Polym. Sci.

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Scratch and indentation tests were performed on a polyoxymethylene homopolymer that was molded using three different mold temperatures. The different microstructures that developed during processing were studied by examining two samples for each mold temperature at different depths. During the scratch tests, the normal and the tangential force were recorded. The tests on the ''as-molded'' surface, in comparison to those that were polished until 1 mm of the material was removed, showed extrema of the normal force at a scratch depth that correspond to the interface of different regimes in the microstructure. The first extremum was considered to be caused by the breaking of the skin layer of the polymer (as a result of the rapid cooling process in the mold). Further extrema correspond to the permeation of the transition zone of the indenter into the spherulitic core of the sample. Indentation tests that were made on the same samples showed that the skin had a slightly lower hardness than the bulk of the polymer and that the difference in hardness decreases with increasing mold temperature.

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Laser Surface Processing

Zohuri

2021

Thermal Effects of High Power Laser Energy on Materials

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Scratch hardness and wear performance of laser-melted steels: Effects of anisotropy

Cited by 9 publications

References 19 publications

Determination of hardness from nanoscratch experiments: Corrections for interfacial shear stress and elastic recovery

Determination of hardness from nanoscratch experiments: Corrections for interfacial shear stress and elastic recovery

Scratch and indentation tests on polyoxymethylene (POM)

Laser Surface Processing

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