Study of Eddy Current Testing Ability on SLM Aluminium Alloy

Area of Science:

• Materials Science
• Non-destructive Testing
• Additive Manufacturing

Background:

• Eddy current testing (ECT) is challenged by high electrical conductivity in aluminium alloys.
• Selective laser melting (SLM) can introduce discontinuities in aluminium alloys.
• ECT offers potential for rapid material identification and defect detection in SLM parts.

Purpose of the Study:

• To assess the efficacy of ECT for identifying artificial defects in SLM-produced AlSi10Mg.
• To evaluate ECT probe performance across various frequency ranges for defect characterization.
• To establish baseline data for developing an ECT methodology for SLM aluminium alloys.

Main Methods:

• Utilized three ECT probes covering 0.3-100 kHz frequency range.
• Investigated artificial defects (notch-type, hole-type, spherical cavities) in SLM AlSi10Mg specimens.
• Analyzed signal sensitivity to defect size, depth, and subsurface conditions (unmolten powder).

Main Results:

• Determined the maximum penetration depth for detectable defects.
• Identified the smallest detectable notch-type and hole-type defects.
• Characterized signal responses based on defect properties and measurement conditions.

Conclusions:

• ECT is a viable method for defect detection in SLM AlSi10Mg.
• Specific ECT probe frequencies and parameters are crucial for effective defectoscopy.
• This research provides foundational data for ECT-based quality control in additive manufacturing.