An important factor has been hard cutting surface quality
发布时间：2015-05-13
An important factor has been hard cutting surface quality
White
layer is accompanied by an organizational form of hard cutting process
is formed, it has a unique wear characteristics: one high hardness, good
corrosion resistance; the other hand, showed high brittleness, can lead
to early spalling failure. Thin
white layer size, it is difficult to accurately analyze its
organizational characteristics, its formation mechanism are still
controversial. One
view is that the white layer is the result of a phase change, is a fine
grain structure of fine martensite the material is rapidly heated and
cooled suddenly in the cutting process and the formation of the
composition. Another
view is that the formation of a white layer just below the deformation
mechanism, but obtained by the plastic deformation unconventional type
martensite. The
white layer is currently regarded as martensite view has been
unanimously approved, the main controversy lies in the fine structure of
the white layer. ykchou
and cjevans that the formation of hard cutting process and cutting the
white layer of heat-related increase flank wear white layer depth will
lead to increased when vb achieve 0.31mm white layer depth of up loμm. b. j. griffiths
think causes the cutting process from layer phenomenon is the
high-speed sliding wear, white layer of tissue morphology of ultrafine
grain structure of austenite and martensite mixed structure, and is
closely related to tool wear. Therefore, further study of the formation mechanism of eight deep white layer and its influence on the life of the part
