Barkhausen Noise Emission in Hard-Milled Surfaces
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Date
2019-02-22
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Abstract
This paper reports on an investigation treating a hard-milled surface as a surface undergoing
severe plastic deformation at elevated temperatures. This surface exhibits remarkable magnetic
anisotropy (expressed in term of Barkhausen noise). This paper also shows that Barkhausen noise
emission in a hard-milled surface is a function of tool wear and the corresponding microstructure
transformations initiated in the tool/machined surface interface. The paper discusses the specific
character of Barkhausen noise bursts and the unusually high magnitude of Barkhausen noise
pulses, especially at a low degree of tool wear. The main causes can be seen in specific structures
and the corresponding domain configurations formed during rapid cooling following surface
heating. Domains are not randomly but preferentially oriented in the direction of the cutting speed.
Barkhausen noise signals (measured in two perpendicular directions such as cutting speed and
feed direction) indicate that the mechanism of Bloch wall motion during cyclic magnetization in
hard-milled surfaces differs from surfaces produced by grinding cycles or the raw surface after
heat treatment.
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Subject(s)
Barkhausen noise, hard-milling, tool wear