scholarly journals Fatigue damage of 60kgf/mm2 class hot-rolled high strength sheet steels determined by X-ray diffraction method.

1989 ◽  
Vol 38 (429) ◽  
pp. 589-595
Author(s):  
Masaya MIZUI ◽  
Hiroshi TAKECHI ◽  
Tomoo SEKINE
Keyword(s):  
Fatigue Damage ◽  
Diffraction Method ◽  
High Strength ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sheet Steels ◽  
Hot Rolled

Assessment of Fatigue Life for High-Temperature Pipeline Welds Using X-Ray Diffraction Technique

2007 ◽  
Vol 353-358 ◽  
pp. 130-133
Author(s):  
Keun Bong Yoo ◽  
Jae Hoon Kim
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Fatigue Damage ◽  
Power Plants ◽  
Low Cycle Fatigue ◽  
Diffraction Method ◽  
Life Assessment ◽  
Fatigue Properties ◽  
X Ray Diffraction ◽  
X Ray

The objective of this study is to examine the feasibility of the X-ray diffraction method for the fatigue life assessment of high-temperature steel pipes used for main steam pipelines, re-heater pipelines and headers etc. in power plants. In this study, X-ray diffraction tests were performed on the specimens simulated for low cycle fatigue damage, in order to estimate fatigue properties at the various stages of fatigue life. As a result of X-ray diffraction tests, it was confirmed that the full width at the half maximum (FWHM) decreased with an increase in the fatigue life ratio, and that the FWHM and the residual stress due to fatigue damage were algebraically linearly related to the fatigue life ratio. From this relationship, a direct assessment of the remaining fatigue life was feasible.

scholarly journals Evaluation of Subsurface Fatigue Damage in Strip Mill Rolls by an X-ray Diffraction Method

1981 ◽  
Vol 21 (2) ◽  
pp. 92-99 ◽  
Author(s):  
Hiroshi TAKECHI ◽  
Kazuo NAMBA ◽  
Keizo FUJIWARA ◽  
Kouichi KAWASAKI
Keyword(s):  
Fatigue Damage ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Residual Stress Measurement Methods Comparison in High-Strength Steel for Naval Application

2014 ◽  
Vol 996 ◽  
pp. 343-348
Author(s):  
Bruno Levieil ◽  
Sylvain Calloch ◽  
Cédric Doudard ◽  
David Thévenet ◽  
Bruno Leblé
Keyword(s):  
High Strength Steel ◽  
Stress Measurement ◽  
Low Cycle Fatigue ◽  
Diffraction Method ◽  
High Strength ◽  
Contour Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plate Specimen ◽  
Good Agreement

Residual stresses can be beneficial or detrimental to mechanical structures. In this work, a rectangular plate specimen with a cold expanded hole was designed to study the influence of these stresses on low cycle fatigue of high-strength steel. Three separated measurements of the stresses were made using different techniques: indentation method, X-ray diffraction method and contour method. The results show good agreement with finite element modelling of the cold-expanded hole problem.

scholarly journals Evaluation of the Fatigue Damage of Rolls for Strip Mills below the Surface by X-ray Diffraction Method

1979 ◽  
Vol 65 (14) ◽  
pp. 2067-2075 ◽  
Author(s):  
Hiroshi TAKECHI ◽  
Kazuo NAMBA ◽  
Koichi KAWASAKI ◽  
Keizo FUJIWARA
Keyword(s):  
Fatigue Damage ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray

On the spallation of oxide scales in high-strength low-alloy (HSLA) hot-rolled steels

2020 ◽  
Vol 38 (4) ◽  
pp. 355-364
Author(s):  
Nelson F. Garza-Montes-de-Oca ◽  
Arnulfo Treviño-Cubero ◽  
Javier H. Ramírez-Ramírez ◽  
Francisco A. Pérez-González ◽  
Rafael D. Mercado-Solís ◽  
...  
Keyword(s):  
Thermal Stress ◽  
Oxide Scale ◽  
High Strength ◽  
Adhesion Energy ◽  
Oxide Scales ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hsla Steels ◽  
Oxide Spallation ◽  
Hot Rolled

AbstractIn this work, results on the causes that could promote the abnormal spallation of the oxides formed on the surface of high-strength low-alloy (HSLA) steels are presented. By means of Rietveld refining of X-ray diffraction spectra, scanning electron microscopy analyses and calculations, it was found that the value of the thermal stress experienced by the oxide scale reached a maximum when the oxide scale was comprised by 65% wt magnetite Fe3O4 and 24% wt wustite FeO this, due to the incomplete transformation of the latter phase to Fe3O4 and α-Fe from cooling from 670 °C to ambient temperature. Contrarily, it was found that when a balance in the amount of Fe3O4 and FeO was 46.4 and 46.5%wt respectively, the calculated thermal stress was reduced, and oxide spallation was not that severe. The reasons for oxide scale detachment from the surface of the steels are explained in terms of the adhesion energy of the bulk oxide scale, the amount of magnetite Fe3O4 present in the oxides and the chemical composition of the steel particularly the elements chromium and titanium.

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