Thema: Texturbestimmung, kaltgewalzter Stahl
Autor/Institution: Altpeter, I.;Dobmann, G.
/Fraunhofer-Inst. für zerst"rungsfreie Prüfverfahren, Saarbrücken, D
Title: Nondestructive characterization of textures in cold-rolled steel products
using the magnetic technique
Titel : Zerstörungsfreie Charakterisierung von Texturen in kaltgewalzten
Stahlerzeugnissen mittels magnetischer Verfahren
Quelle : Nondestructive Characterization of Materials VI. Sixth Int. Symposium,
Oahu, USA, June 7-11, 1993
1994
; New York: Plenum Press
; ISBN 0-306-44816-5
; S.807-816
; 10S,7B,18Q
; BAM-Z-0497/95
; E
Abstract:
Deep drawability of steel sheets is not an intrinsic material property,
and therefore, cannot be measured directly by using the physical basis. It
is determined by plastic anisotropy destructively measured in 0 deg, 45
deg and 90 deg orientation performing a strain experiment; 0 deg ist the
rolling direction. A strong correlation exists with the elastic properties
of the materials depending on crystallographic texture. The task of the
following paper is to describe the 3MA-method (Micromagnetic
Multiparameter-, Microstructure- and Stress-Analysis) as a nondestructive
technique for texture evaluation. 3MA-parameters are the magnetic
Barkhausen noise, the analysis of upper harmonics of the tangential field
strength and the dynamic magnetostriction. Because of the high sensitivity
of most of these quantities to stress and residual stress in the
calibration process, the stress dependence has to be observed. An approach
combining the different measuring quantities - Barkhausen noise amplitude,
coercivity force, the distortion factor of the tangential magnetic field
as well as the dynamic magnetostriction - has been optimized to separate
the influence of stress from the influence of texture on the quantities
and to evaluate the drawability parameters r(ind m) and Delta r. A
combination probe has been built, enabling the measurement of the
mentioned magnetic properties. Based on investigations of each quantity
using sets of samples with known drawability data, a regression algorithm
to evaluate r(ind m) and Delta r data has been optimized. The result is
the evaluation of the r(ind m) and Delta r values within an inaccuracy of
better than +/- 10 % which can be improved by integrating the elastic
anisotropy coefficients in the approach determined by ultrasonic testing
with the same transducer. .1 F33,B13,H13,A25
Database Keywords: Zerstörungsfreie Prüfung, :Textur, :Kaltgewalztes Blech, Stahl,
Tiefziehfähigkeit, :Magnetische Prüfung, Barkhausen Effekt, Magnetisches
Feld, Magnetostriktion, Meßgerät, Elektrodynamischer Wandler, Mechanische
Spannung
23 Oberwellenanalyse, Spannungseinfluß, Mehrparameterverfahren,
:Verfahrenskombination
24 Z:J
File Producer: FWD Förderverein Werkstoffdokumentation e.V. (DGZfP, BAM, FIZ Technik)
Brief Information about FWD: Virtual Library about FWD
| Frontpage |
| Abstracts List | |Virtual Library: Archives and Databases|
Rolf Diederichs 1. Dec 1996,
info@ndt.net