Diagnosis of austenitic steel valves with the magneto-optical method

Samples selected from damaged austenitic steel valves of diesel engines have been examined using the magneto-optical (MO) method. The method uses a magnetic excitation normal to the material surface and enables the assessment of two conditions of the originally non-magnetic austenitic steel, namely...

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Bibliographic Details
Published in:NDT & E international : independent nondestructive testing and evaluation 2007-04, Vol.40 (3), p.203-207
Main Authors: Novotný, P., Macháč, P., Kučera, M., Nitsch, K., Skrbek, B.
Format: Article
Language:English
Subjects:
Analysing. Testing. Standards
Applied sciences
Austenitic materials
Engines and turbines
Exact sciences and technology
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Internal combustion engines: gazoline engine, diesel engines, etc
Magneto-optics
Measurement and testing methods
Mechanical engineering. Machine design
Metallography
Metals. Metallurgy
Non-destructive testing
Nondestructive testing
Physics
Solid mechanics
Structural and continuum mechanics
Testing for defects
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Summary:Samples selected from damaged austenitic steel valves of diesel engines have been examined using the magneto-optical (MO) method. The method uses a magnetic excitation normal to the material surface and enables the assessment of two conditions of the originally non-magnetic austenitic steel, namely an integral one, when the coercivity H c is measured, and a local one that concentrates on the detection and assessment of individual defects. The results have shown that the operational load increases H c of these materials and a defect of the fatigue crack type has been detected in the position of the valve failure.
ISSN:0963-8695
1879-1174
DOI:10.1016/j.ndteint.2006.10.010