Residual Stress State Characterization of Machined Components by X-ray Diffraction and Multiparameter Micromagnetic Methods |
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Authors: | J Epp T Hirsch |
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Institution: | (1) Foundation Institute of Materials Science, Badgasteiner Str. 3, Bremen, Germany |
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Abstract: | Machining induced residual stress states have been identified to affect the distortion of parts during following heat treatments.
Thus, ideally a complete characterization of the components residual stress state is required. Magnetic and micromagnetic
analysis of residual stresses can represent an important gain of time compared to X-ray diffraction. Investigations with these
two methods were performed on different components with various and inhomogeneous residual stress states: cylindrical and
tapered ball bearing rings made from AISI52100 steel and a disc made from AISI5210 steel. Reliable results and good agreement
between X-ray diffraction data and residual stresses obtained from the magnetic and micromagnetic analysis can be obtained
with the use of a calibration for each single component. An important gain of time can be achieved with the combined use of
X-ray diffraction analysis for the calibration and the micromagnetic technique. However, local residual stress variations
in zones smaller than the sensor size may not be detected. A global calibration of the micromagnetic equipment with one calibration
file for several parts still needs optimization. |
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