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Magnetic Evaluation of Residual Stresses and Structure Transformations Induced in Soft Steel after Turning

100%
Čilliková M., Dubec J., Neslušan M., Mičietová A., Blažek D.
Acta Physica Polonica A
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2014
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vol. 126
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issue 1
60-61
EN
This paper deals with the stress and temperature induced microstructure transformations in a soft bearing steel 100Cr6 after turning operation. Investigation is carried out through a technique based on Barkhausen effect. Evaluation of surface integrity via structure transformations, X-ray diffraction as well as microhardness inspection is carried out as well. Surface integrity is investigated with the respect to the variable tool wears and consequent mechanical and thermal loads applied on the inspected surfaces. Different surface microstructures caused by the mechanical and associated thermal aspects of the surface formation are discussed and correlated with the parameters obtained from the measured Barkhausen emissions.
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Magneto-Structural Anisotropy of Hard Milled Surface

86%
Mičietová A., Uríček J., Blažek D., Neslušan M., Kejzlar P., Čilliková M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1087-1089
EN
This paper deals with investigation of hard milled surface as a surface undergoing severe plastic deformation at elevated temperatures. This surface exhibits quite remarkable magnetic anisotropy (expressed in term of the Barkhausen noise) and differs from ground surfaces. The main reason can be viewed in specific structure and the corresponding domains configuration formed during rapid cooling following after surface heating. Domains are not randomly but preferentially oriented in the direction of the cutting speed at the expense of feed direction. The Barkhausen noise signals (measured in two perpendicular directions such as cutting speed and feed direction) indicate that the mechanism of the Bloch wall motion during cyclic magnetization in hard milled surfaces differ from surfaces produced by grinding cycles or the raw surface after heat treatment.
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