Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

The problem of inspecting case-hardened steel has been of interest to industry for some time. A reliable nondestructive method is sought that will not only enable the depth-of-treatment to be established but will also provide some measure of a component’s bulk material properties and surface condition. While some methods can provide an adequate solution to the problem of measuring case depth, we will show the limitations and pitfalls awaiting the unwary. For example, small variations in heat-treatment conditions can lead to large differences in microstructure, and hence magnetic properties, of a steel. This can be especially true for the near surface layers of a component being treated. These variations in magnetic properties have a strong effect on eddy current and magnetic measurements and can lead to inaccurate results when measuring case depth. In addition, batch variations in material properties can also affect the measurements.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18B

Chapter

Chapter 6: Materials Characterization

Section

Materials Properties

Pages

1733-1740

DOI

10.1007/978-1-4615-4791-4_222

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Eddy-Current and Magnetic Measurements on Case-Hardened Steel

Snowbird, UT, USA

The problem of inspecting case-hardened steel has been of interest to industry for some time. A reliable nondestructive method is sought that will not only enable the depth-of-treatment to be established but will also provide some measure of a component’s bulk material properties and surface condition. While some methods can provide an adequate solution to the problem of measuring case depth, we will show the limitations and pitfalls awaiting the unwary. For example, small variations in heat-treatment conditions can lead to large differences in microstructure, and hence magnetic properties, of a steel. This can be especially true for the near surface layers of a component being treated. These variations in magnetic properties have a strong effect on eddy current and magnetic measurements and can lead to inaccurate results when measuring case depth. In addition, batch variations in material properties can also affect the measurements.