電子線後方散乱回折法による浸炭焼入鋼の 硬化層深さと残留応力の評価

Translated title of the contribution: Evaluation of Residual Stress and Case Depth in Carburized and Quenched Chromium-Molybdenum Steel by Electron Backscattering Diffraction Method

坂井田 喜久, 稲山 朝仁, 矢代 茂樹

Research output: Contribution to journalArticle

Abstract

A chromium-molybdenum steel composed of 0.20 mass% carbon was used as a starting material. Two 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 electron backscattering diffraction method. The kernel average misorientation, <i>Θ</i>, of the inverse pole figure were calculated from the carburized surface to the interior of each specimen. The area-average, <i>Θ<sub>mean</sub></i>, 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 heat treatment. The estimated depth of the increment in the <i>Θ<sub>mean</sub></i> 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, the case depth and eigen strain distribution that induce the compressive residual stress can be indirectly estimated by electron backscattering diffraction method.
Original languageJapanese
Pages (from-to)557-562
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume63
Issue number7
DOIs
Publication statusPublished - Jul 2014

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Molybdenum
Steel
Chromium
Backscattering
residual stress
molybdenum
chromium
Residual stresses
backscattering
Diffraction
steels
Compressive stress
Electrons
evaluation
diffraction
Carburizing
electrons
Stress concentration
Quenching
Poles

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電子線後方散乱回折法による浸炭焼入鋼の 硬化層深さと残留応力の評価. / 坂井田喜久; 稲山朝仁; 矢代茂樹.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 63, No. 7, 07.2014, p. 557-562.

Research output: Contribution to journalArticle

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abstract = "A chromium-molybdenum steel composed of 0.20 mass{\%} carbon was used as a starting material. Two 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 electron backscattering diffraction method. The kernel average misorientation, Θ, of the inverse pole figure were calculated from the carburized surface to the interior of each specimen. The area-average, Θmean, 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 heat treatment. The estimated depth of the increment in the Θmean 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, the case depth and eigen strain distribution that induce the compressive residual stress can be indirectly estimated by electron backscattering diffraction method.",
author = "喜久 坂井田 and 朝仁 稲山 and 茂樹 矢代",
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AU - 稲山, 朝仁

AU - 矢代, 茂樹

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AB - A chromium-molybdenum steel composed of 0.20 mass% carbon was used as a starting material. Two 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 electron backscattering diffraction method. The kernel average misorientation, Θ, of the inverse pole figure were calculated from the carburized surface to the interior of each specimen. The area-average, Θmean, 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 heat treatment. The estimated depth of the increment in the Θmean 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, the case depth and eigen strain distribution that induce the compressive residual stress can be indirectly estimated by electron backscattering diffraction method.

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