Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Mechanism of a white layer formation as a result of tribological contacts

JANUSZ KRAWCZYK

nr katalogowy: 79721

The review of ideas concerning the mechanism of a white layer formation as a result of machining, was presented in paper [1]. The main, already proposed in 1944 [2], concept is that fresh martensite, originated from austenite formed as a result of heating over the Ac3 temperature, is the main component of the white layer. Assumption of this idea is supported in several papers, among others in [3÷7]. This concept seems to be confirmed by an increased fraction of retained austenite in the white layer in relation to the initial material [7]. However, obtaining so high temperature (over Ac3) during a tribological influence is rather difficult [8]. Thus, it is difficult to explain - in a different way - the investigation results indicating the presence of the main austenite fraction in the white layer structure [9]. However, on the grounds of observations revealing very fine grains [10÷20] within the white layer a new concept is formulated, stating that this layer formation is related to an intensive plastic deformation and to dynamic recovery or recrystallisation processes [1]. This concept, documented metallographically, in relation to deformation bands occurring not on the surface but in the material core, after an intensive rolling contact fatigue influence, was presented in paper [21]. It was noticed in work [1] that those, mentioned above, seemingly contradictory ideas of the white layer formation mechanism, can be connected into the logical entity. On the basis of reference data as well as author’s own investigations the idea of the main assumptions of the white layer formation mechanism will be proposed in the hereby paper. OWN INVESTIGATIONS RESULTS AND A CONCEPT OF THE WHITE LAYER FORMATION MECHANISMS The preliminary proposition of this mechanism (co-authored by the present author) was presented in paper [22]. It assumed that the white layer is formed as a result of a very fast heating of the material surface laye[...]

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