Measurement of Ultrasonic Attenuation and Grain Size of Thin Metal Sheets Using Resonance Mode EMAT

1994 ◽  
pp. 551-557
Author(s):  
Takao Hyoguchi ◽  
Toshio Akagi ◽  
Oliver B. Wright ◽  
Katsuhiro Kawashima
Keyword(s):  
Grain Size ◽  
Ultrasonic Attenuation ◽  
Resonance Mode ◽  
Thin Metal ◽  
Metal Sheets

GRAIN-SIZE MEASUREMENTS IN THIN METAL SHEETS BY LASER-GENERATED ULTRASOUND

1989 ◽  
pp. 261-263 ◽  
Author(s):  
M. Paul ◽  
H. Peukert ◽  
W. Arnold
Keyword(s):  
Grain Size ◽  
Thin Metal ◽  
Metal Sheets

Non-contact and Nondestructive Evaluation of Grain-size in Thin Metal Sheets

1989 ◽  
pp. 337-344 ◽  
Author(s):  
S. Faßbender ◽  
M. Kulakov ◽  
B. Hoffmann ◽  
M. Paul ◽  
H. Peukert ◽  
...  
Keyword(s):  
Grain Size ◽  
Nondestructive Evaluation ◽  
Thin Metal ◽  
Metal Sheets

Slip traces caused by plastic deformation during recrystallization of thin metal sheets

1994 ◽  
Vol 52 ◽  
pp. 620-621
Author(s):  
H. Lin ◽  
D. P. Pope
Keyword(s):  
Grain Size ◽  
Grain Boundaries ◽  
Sample Thickness ◽  
List Type ◽  
Metal Sheets ◽  
Second Phases ◽  
Slip Traces ◽  
Series Of Experiments ◽  
Cold Rolled ◽  
Individual Grains

During a study of mechanical properties of recrystallized B-free Ni3Al single crystals, regularly spaced parallel traces within individual grains were discovered on the surfaces of thin recrystallized sheets, see Fig. 1. They appeared to be slip traces, but since we could not find similar observations in the literature, a series of experiments was performed to identify them. We will refer to them “traces”, because they contain some, if not all, of the properties of slip traces. A variety of techniques, including the Electron Backscattering Pattern (EBSP) method, was used to ascertain the composition, geometry, and crystallography of these traces. The effect of sample thickness on their formation was also investigated.In summary, these traces on the surface of recrystallized Ni3Al have the following properties:1.The chemistry and crystallographic orientation of the traces are the same as the bulk. No oxides or other second phases were observed.2.The traces are not grooves caused by thermal etching at previous locations of grain boundaries.3.The traces form after recrystallization (because the starting Ni3Al is a single crystal).4.For thicknesses between 50 μm and 720 μm, the density of the traces increases as the sample thickness decreases. Only one set of “protrusion-like” traces is visible in a given grain on the thicker samples, but multiple sets of “cliff-like” traces are visible on the thinner ones (See Fig. 1 and Fig. 2).5.They are linear and parallel to the traces of {111} planes on the surface, see Fig. 3.6.Some of the traces terminate within the interior of the grains, and the rest of them either terminate at or are continuous across grain boundaries. The portion of latter increases with decreasing thickness.7.The grain size decreases with decreasing thickness, the decrease is more pronounced when the grain size is comparable with the thickness, Fig. 4.8.Traces also formed during the recrystallization of cold-rolled polycrystalline Cu thin sheets, Fig. 5.

scholarly journals Incremental Hole-Drilling Method Vs. Thin Components: A Simple Correction Approach

2014 ◽  
Vol 996 ◽  
pp. 283-288 ◽  
Author(s):  
Esther Held ◽  
Simone Schuster ◽  
Jens Gibmeier
Keyword(s):  
Residual Stress ◽  
Thin Metal ◽  
Hole Drilling ◽  
Depth Profiles ◽  
Hole Drilling Method ◽  
Incremental Hole Drilling ◽  
Metal Sheets ◽  
Drilling Method ◽  
Measured Strain ◽  
The Impact

The incremental hole-drilling method is a widely used technique to determine residual stress depth profiles in technical components. Its application is limited in respect to the components geometry, for instance the components thickness. In this paper, a direct correction of the measured strain relaxations is proposed to consider the impact of deviant geometries, here the component thickness, on the residual stress evaluation that moreover, allows the application of commercially available evaluation software. The herein proposed approach is based on finite element simulation of the incremental hole drilling. The simulated strain relaxations for thin metal sheets are evaluated with an algorithm as used in commercially available evaluation software (i) for uncorrected data as well as (ii) for strain data corrected by the proposed correction procedure. It is shown that the correction approach leads to a significant improvement of the measurement accuracy. Further, by means of the approach residual stress depth profiles in thin metal sheets can be as usual determined using commercial evaluation software for the incremental hole-drilling method regardless of the algorithm used, i.e. differential or integral.

Plasma plume oscillations during welding of thin metal sheets with a CW CO2laser

2000 ◽  
Vol 34 (2) ◽  
pp. 189-199 ◽  
Author(s):  
Z Szymanski ◽  
J Hoffman ◽  
J Kurzyna
Keyword(s):  
Plasma Plume ◽  
Thin Metal ◽  
Metal Sheets

Formation of slip traces during recrystallization of thin metal sheets

1995 ◽  
Vol 71 (6) ◽  
pp. 1241-1253 ◽  
Author(s):  
Hui Lin ◽  
D. P. Pope
Keyword(s):  
Thin Metal ◽  
Metal Sheets ◽  
Slip Traces
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