524 Evaluation of Residual Stress and Hardened Layer in Chrome Molybdenum Steel after Carburizing and Quenching by Electron Backscattering Diffraction Method

2014 ◽  
Vol 2014.63 (0) ◽  
pp. _524-1_-_524-2_
Author(s):  
Tomohito Inayama ◽  
Yoshihisa Sakaida ◽  
Shigeki Yashiro
Keyword(s):  
Residual Stress ◽  
Diffraction Method ◽  
Hardened Layer ◽  
Electron Backscattering ◽  
Electron Backscattering Diffraction ◽  
Molybdenum Steel

scholarly journals Estimation of Cross-Sectional Residual Stress Distributionon Hardened Layer of Carburized Chromium-Molybdenum Steel by Electron Backscattering Diffraction Method

2014 ◽  
Vol 996 ◽  
pp. 556-561
Author(s):  
Yoshihisa Sakaida ◽  
Tomohito Inayama ◽  
Shigeki Yashiro
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Diffraction Method ◽  
Hardened Layer ◽  
Case Depth ◽  
Polished Surface ◽  
Cross Sectional ◽  
Electron Backscattering ◽  
Electron Backscattering Diffraction ◽  
The Cross

A chromiummolybdenum steel composed of 0.20 mass% carbon was used as a starting material. Three kinds of specimens having different case depths were made by carburizing and quenching. Using the scanning electron microscope, the crystallographic information was measured on the cross-sectional hardened layer by EBSD (electron backscattering diffraction) technique. The KAM (kernel average misorientation, Θ) maps were calculated from the carburized surface to the interior below the case depth of each specimen. The area-average, Θmean, of the KAM map was compared to the case depth and the cross-sectional residual stress distribution measured by x-ray. As a result, the area-average of the hardened layer was larger than that of the interior of specimen after quenching. The estimated depth of the increment in the Θmean was found to accord to the case depth and be proportional to the depth in which large compressive residual stress was distributed on the gradually polished surface. Therefore, both the case depth and eigen strain distribution that induce the compressive residual stress are indirectly estimable by electron backscattering diffraction method.

Measuring Strains for Hematite Phase in Sinter Ore by Electron Backscattering Diffraction Method

2006 ◽  
Vol 326-328 ◽  
pp. 237-240 ◽  
Author(s):  
Yasushi Sasaki ◽  
Manabu Iguchi ◽  
Mitsutaka Hino
Keyword(s):  
Linear Relationship ◽  
Strain Gauge ◽  
Diffraction Method ◽  
Local Strain ◽  
Electron Backscattering ◽  
Hematite Phase ◽  
Compression Strain ◽  
Electron Backscattering Diffraction ◽  
Ebsd Technique ◽  
The Relationship

Based on the relationship between quantified blurring degree of Kikuchi bands obtained by an electron backscattering diffraction (EBSD) technique and macroscopic strains measured by a strain gauge, the local compression strain SEBSD in sinter ore has been evaluated under various conditions. There is a good linear relationship between the SEBSD and the strains measured by a strain gauge. The local strain SEBSD evaluated by EBSD patterns can be used as an index of local strains.

scholarly journals Measuring Strains for Hematite Phase in Sinter by Electron Backscattering Diffraction Method

2005 ◽  
Vol 45 (4) ◽  
pp. 582-586 ◽  
Author(s):  
Yasushi SASAKI ◽  
Kenyu OHKAWARA ◽  
Manabu IGUCHI ◽  
Kuniyoshi ISHII ◽  
Mitsutaka HINO
Keyword(s):  
Diffraction Method ◽  
Electron Backscattering ◽  
Hematite Phase ◽  
Electron Backscattering Diffraction

Experiment and Simulation on Residual Stress of Surface Hardened Layer in Grind-Hardening

2011 ◽  
Vol 175 ◽  
pp. 166-170 ◽  
Author(s):  
Lei Zhang ◽  
Pei Qi Ge ◽  
Wen Bo Bi ◽  
Qian Zhang
Keyword(s):  
Residual Stress ◽  
Diffraction Method ◽  
Hardened Layer ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
Grind Hardening ◽  
Stripping Method ◽  
Experimental Values ◽  
Surface Hardened Layer

The grinding heat is utilized to induce martensitic phase transformation and strengthen the surface layer of alloy steel by raising surface temperature higher than austenitic temperature and cooling quickly. The surface residual stress is an important factor to evaluate the quality of surface hardening layer effectively. The experimental values of residual stress in the surface hardened layer are achieved by using X-ray diffraction method and corrosion stripping method. The numerical values of residual stress are simulated by using re-meshing and finite element method. The simulation values trend of residual stress in surface hardened layer is consistent with experimental results.

Residual Stress Evaluation of Ni Based Weld Metal Using Neutron Diffraction Method

2006 ◽  
Vol 524-525 ◽  
pp. 697-702 ◽  
Author(s):  
Shinobu Okido ◽  
Hiroshi Suzuki ◽  
K. Saito
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Neutron Diffraction ◽  
Weld Metal ◽  
Diffraction Method ◽  
Fem Analysis ◽  
Butt Weld ◽  
Stress Evaluation ◽  
Neutron Diffraction Method

Residual stress generated in Type-316 austenitic stainless steel butt-weld jointed by Inconel-182 was measured using a neutron diffraction method and compared with values calculated using FEM analysis. The measured values of Type-316 austenitic stainless steel as base material agreed well with the calculated ones. The diffraction had high intensity and a sharp profile in the base metal. However, it was difficult to measure the residual stress at the weld metal due to very weak diffraction intensities. This phenomenon was caused by the texture in the weld material generated during the weld procedure. As a result, this texture induced an inaccurate evaluation of the residual stress. Procedures for residual stress evaluation to solve this textured material problem are discussed in this paper. As a method for stress evaluation, the measured strains obtained from a different diffraction plane with strong intensity were modified with the ratio of the individual elastic constant. The values of residual stress obtained using this method were almost the same as those of the standard method using Hooke’s law. Also, these residual stress values agreed roughly with those from the FEM analysis. This evaluation method is effective for measured samples with a strong texture like Ni-based weld metal.

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