In-Process Coating Layer Analysis of Galvannealed Steel Sheets with Monochromatic Incident X-Rays

1992 ◽  
pp. 1211-1218
Author(s):  
Hiroharu Kato ◽  
Kiyotaka Imai ◽  
Hideya Tanabe
Keyword(s):  
Coating Layer ◽  
X Rays ◽  
Steel Sheets ◽  
Layer Analysis ◽  
Galvannealed Steel

In-Process Coating Layer Analysis of Galvannealed Steel Sheets with Monochromatic Incident X-Rays

1991 ◽  
Vol 35 (B) ◽  
pp. 1211-1218
Author(s):  
Hiroharu Kato ◽  
Kiyotaka Imai ◽  
Hideya Tanabe
Keyword(s):  
High Speed ◽  
Coating Layer ◽  
Statistical Error ◽  
Optical Systems ◽  
X Rays ◽  
Steel Sheets ◽  
Line Measurement ◽  
On Line ◽  
Coating Weight ◽  
Galvannealed Steel

AbstractA new method, for the on-line determination of the composition and the coating weight of galvannealed (Zn-Fe-alloy-coated) steel sheets using monochromatic incident x-rays with two optical systems, is described. In the case of galvannealed steel sheets, it is difficult to determine the composition and the coating weight precisely by simple XRF, because fluorescent x-rays of Iron are emitted not only from the coating layer but also from the underlying steel sheets. We have developed an on-line analyzer with two optical systems which are different in incident angles, take-off angles and wavelengths of monochromatic incident x-rays. We determine the composition and the coating weight by solving simultaneous equations of the data which we derive using two optical systems. Using monochromatic x-rays enabled us to obtain high precision with high speed. We considered en-or factors in on-line measurement such as statistical error or fluctuation of the distance between the sensor head and steel sheets. This on-line analyzer has been applied to the continuous galvanizing line in our Fukuyama works successfully. As a result, we have been able to significantly improve product quality.

Effect of Coating Layer on Advanced Stud Welding of 2024 Aluminum Alloy to Galvanized and Galvannealed Steel Sheet

2014 ◽  
Vol 794-796 ◽  
pp. 351-356
Author(s):  
Yohei Harada ◽  
Kozo Ishizuka ◽  
Shinji Kumai
Keyword(s):  
Aluminum Alloy ◽  
Steel Sheet ◽  
Coating Layer ◽  
Fracture Load ◽  
Tensile Fracture ◽  
2024 Aluminum Alloy ◽  
Steel Sheets ◽  
Sheet Surface ◽  
Stud Welding ◽  
Galvannealed Steel

High strength 2024 aluminum alloy studs were joined to galvanized, galvannealed and non-coated steel sheets by using an advanced stud welding method. Effect of the coating layer on the interfacial microstructure and the tensile fracture load of the joints were evaluated. A specially-designed stud having a circular projection at its bottom was pressed against a sheet surface. A discharge current was introduced from the upper part of the stud. Local heating could be achieved by a high current density at a contact point between the projection and sheet. The observation of joint area revealed the projection was severely deformed and spread along the sheet surface. The coating layer of the galvanized steel sheet was removed at the joint interface under the charging voltage of 200 V, while that of the galvannealed one locally remained on the steel surface even at 400 V. This would be strongly related to the melting or liquidus and solidus temperatures of each coating layer. Joining was not achieved at a low charging voltage in the non-coated and galvannealed steel sheets, while high tensile fracture load was obtained even at 200 V in the galvanized ones.

scholarly journals Estimation of 8th, 10th and 12th Order ODF Coefficients From Elastic Properties in Cold Rolled Steel Sheets by Adjustment of Single Crystal Elastic Constants

1990 ◽  
Vol 12 (1-3) ◽  
pp. 175-185 ◽  
Author(s):  
Kei Sakata ◽  
Dominique Daniel ◽  
John J. Jonas
Keyword(s):  
Single Crystal ◽  
Elastic Constants ◽  
Elastic Energy ◽  
X Rays ◽  
Rolled Steel ◽  
Steel Sheets ◽  
Fitting Procedure ◽  
Pole Figures ◽  
Cold Rolled ◽  
Fiber Components

In an earlier paper (Sakata et al., 1989), it was shown that the 4th and 6th order ODF coefficients could be successfully derived from Young's modulus measurements using the elastic energy method. However, the values of some of the coefficients fell beyond the expected error ranges. In this study, more appropriate single crystal elastic constants are selected by means of a fitting procedure. Then the ODF coefficients are again estimated in the manner described previously. As a result, the values of the C411, C611, C612 and C614 coeffioents, which were somewhat inaccurate in the previous calculation, are improved considerably. The volume fractions of the principal preferred orientations are then employed to predict the 8th order coefficients and the fiber components of the l = 10 and l = 12 (C1011, C1211 and C1221) coefficients. With the aid of the coefficients obtained in this way, both pole and inverse pole figures are drawn, which are in better agreement with those based on X-rays than when only the 4th order coefficients are employed.

scholarly journals Influence of Fe-P Flash Coating on Anti-powdering Property and Friction Behavior of Galvannealed Steel Sheets

1991 ◽  
Vol 77 (7) ◽  
pp. 1184-1191 ◽  
Author(s):  
Akira YASUDA ◽  
Makoto ISOBE ◽  
Youichi TOBIYAMA ◽  
Koji YAMATO
Keyword(s):  
Friction Behavior ◽  
Steel Sheets ◽  
Galvannealed Steel

scholarly journals The Relation between the Powdering and the Microstructure of the Coating of Galvannealed Steel Sheets

1986 ◽  
Vol 72 (8) ◽  
pp. 997-1004 ◽  
Author(s):  
Yoshikuni TOKUNAGA ◽  
Masato YAMADA ◽  
Takashi HADA
Keyword(s):  
Steel Sheets ◽  
Galvannealed Steel
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