Location

Williamsburg, VA

Start Date

1-1-1988 12:00 AM

Description

Micromagnetic techniques since years have been used to characterize the microstructure and to analyse residual stress states in magnetizable materials, i.e. steels [1,2]. Applying a dynamic sinusoidal magnetization in the frequency range 50 mHz ≦ f ≦ 110 Hz with field strength maxima up to 150 A/cm irreversible (magnetic Barkhausen noise) and reversible (incremental permeability) micromagnetic processes (Bloch-wall-jumps, rotations) give independent nd-quantities together with a derived coercivity. The question arises as to whether these techniques can be adapted for the characterization of surface-hardened materials for the estimation of the hardening depth.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

7B

Chapter

Chapter 7: Characterization of Materials

Section

Ferromagnetic Materials and Weldments

Pages

1471-1475

DOI

10.1007/978-1-4613-0979-6_71

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Quantitative Hardening-Depth-Measurements Up to 4 mm by Means of Micro-Magnetic Microstructure Multiparameter Analysis (3MA)

Williamsburg, VA

Micromagnetic techniques since years have been used to characterize the microstructure and to analyse residual stress states in magnetizable materials, i.e. steels [1,2]. Applying a dynamic sinusoidal magnetization in the frequency range 50 mHz ≦ f ≦ 110 Hz with field strength maxima up to 150 A/cm irreversible (magnetic Barkhausen noise) and reversible (incremental permeability) micromagnetic processes (Bloch-wall-jumps, rotations) give independent nd-quantities together with a derived coercivity. The question arises as to whether these techniques can be adapted for the characterization of surface-hardened materials for the estimation of the hardening depth.