Exact(3)
This mixed bainite/pearlite microstructure could have comparable hardness values with fine pearlite and therefore cannot be detected by normal rim hardness measurements at the quality control stage.
Wheels in heavy haul service in Australia are generally specified to the AAR requirements [13], with the most commonly used grades being the Class B with a rim hardness range of 302 341 HB and the Class C with a rim hardness range of 321 363 HB.
In addition, microalloyed versions of both grades have been developed and are in widespread use; these provide rim hardness levels of 321 363 HB and 341 388 HB, respectively.
Similar(57)
Microstructures and mechanical properties of the improved wheel steel at different depths in the wheel rim were evaluated by optical microscopy, scanning electron microscopy, electron probe microanalysis, tensile, hardness and Charpy impact tests, with a comparison to two traditional wheel steels.
By 4 weeks, SrRan treatment was associated with higher elastic modulus, hardness, and working energy of trabecular bone expanding from the defect rim (+26%, P < 0.01; +26%, P < 0.05; and +23%, P < 0.05, resp).
The hardness of materials reduces with an increase in the depth in the wheel rim due to the increasing of proeutectoid ferrite fraction and interlamellar spacing.
The rim chill/quench process used in wheel manufacturing aims to produce fine pearlitic microstructures to improve the hardness at the rim surface.
We must endure hardness.
It is hardness.
See also Knoop hardness.
And RIM?
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