Method for Non-Destructively Determining Material Properties

• US 20170284967A1
• Filed: 06/16/2017
• Published: 10/05/2017
• Est. Priority Date: 12/18/2014
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: AIGNER, Alexander, ANASENZL, Manuel, KLINKENBERG, Franz-Josef
• Granted Patent: US 10,458,950 B2
• Time in Patent Office: Days
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: G01M 5/0091 by using electromagnetic excitation or detection
• CPC Class Codes: G01N 27/90 using eddy currents
• CPC Class Codes: G01N 27/9046 by analysing electrical signals
• CPC Class Codes: G01N 33/2045 Defects

Abstract

An approach to determining the crash dynamic behavior of structural castings made of a AlSi10MnMg alloy in a simple and cost-effective manner is provided. In this approach eddy current testing is carried out using a high-resolution measuring coil which is adjusted to the cast-specific conductivity.

Claims

1. A method for non-destructive determining of material properties of electrically conductive components, comprising the act of:

moving an electromagnetic eddy current testing sensor at least one of on and near a surface of at least one sample cast component in a manner producing a varying magnetic field in the sample cast component;

sensing with the sensor eddy currents in the at least one sample cast component; and

displaying in human-readable form a measurement signal indicative of the eddy currents resulting in the at least one sample cast component from the varying magnetic field,

wherein the electromagnetic eddy current testing sensor in a high-resolution eddy current sensor adapted to a conductivity of the at least one sample cast component.

2. The method as claimed in patent claim 1, further comprising the acts of

storing a reference eddy current measurement signal from a reference cast component with known impact-dynamic and/or crash-dynamic deformability;

displaying in human-readable form the reference measurement signal with a gain of the reference measurement signal adjusted to a reference location in the display; and

determining the relative impact-dynamic and/or crash-dynamic deformability of the at least one sample cast component relative to the impact-dynamic and/or crash-dynamic deformability of the reference cast component by comparing the displayed measurement signal of the at least one sample cast component to the displayed reference measurement signal.

3. The method as claimed in claim 2, wherein

a testing temperature at which the eddy current in the at least one sample cast component is sensed is the same as a testing temperature at which the reference cast component is sensed.

4. The method as claimed in claim 2, wherein

the at least one sample cast component is a plurality of sample cast components, and

a testing temperature at which the eddy current in at least two of the plurality of sample cast components is the same.

5. The method as claimed in claim 1, wherein

a material of the at least one sample cast component is an AlSi10MnMg alloy having a magnesium content between 0.05 and 0.60 wt %.

6. The method as claimed in claim 5, wherein

the magnesium content of the AlSi10MnMg alloy is between 0.14 and 0.45 wt %.

7. The method as claimed in claim 6, wherein

the magnesium content of the AlSi10MnMg alloy is between 0.14 and 0.30 wt %.

8. The method as claimed in claim 1, wherein

a material of the at least one sample cast component is

an alloy in a cast state without prior active heat treatment,

an alloy after single-stage heat treatment, or

an alloy after two-stage heat treatment with at least one of water and air-quenching.