Barkhausen noise assessment of the surface conditions due to deep hole drilling and their influence on the fatigue behaviour of AISI 4140
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Date
2018-09-13
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Abstract
In many technical fields, high-strength steels like AISI 4140 are commonly used for
highly dynamically loaded parts. Increasing demands on weight, performance and efficiency of the
automotive industry lead to increasing demands on material properties. For surface conditioning,
optimised machining processes are capable of improving the fatigue performance without increasing
the production cost significantly. This paper compares the influence of three different sulphur
contents and three different feed rates on the fatigue behaviour of deep hole drilled AISI 4140
fatigue specimens. The specimens were characterised regarding their surface condition, hardness and
microstructure, and afterwards they were tested under fatigue loading for performance assessment.
These tests were accompanied with Barkhausen noise analysis. The Barkhausen noise signal was
detected by a custom-built sensor that is capable of detecting the magnetic values on the bore wall.
Using this technique, a load-independent estimation of fatigue damage was established.
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Keywords
structural health monitoring, fatigue behaviour, quenched and tempered steel, AISI 4140, 42CrMo4 + QT, surface condition, magnetic Barkhausen noise