Influence of Segregation of a Large Forged Steel Product on X-Ray Stress Measurement by the Cosα Method

Surface treatments involving residual stresses are an effective method to increase the fatigue strength of forged steel products. Therefore, X-ray stress measurement is important to evaluate the fatigue strength of these materials. For large forged steel products, regions where alloy elements are se...

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Veröffentlicht in:Journal of the Society of Materials Science, Japan Japan, 2019/03/15, Vol.68(3), pp.285-291
Hauptverfasser: MATSUDA, Mariko, KABUTOMORI, Tatsuhiko, TAKAMATSU, Hiroyuki, TAKASHIMA, Ichiro, SASAKI, Toshihiko
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container_issue 3
container_start_page 285
container_title Journal of the Society of Materials Science, Japan
container_volume 68
creator MATSUDA, Mariko
KABUTOMORI, Tatsuhiko
TAKAMATSU, Hiroyuki
TAKASHIMA, Ichiro
SASAKI, Toshihiko
description Surface treatments involving residual stresses are an effective method to increase the fatigue strength of forged steel products. Therefore, X-ray stress measurement is important to evaluate the fatigue strength of these materials. For large forged steel products, regions where alloy elements are segregated cannot be avoided. Furthermore, because of the large size of these products, it may be difficult to measure their residual stresses in a laboratory. Nevertheless, compact and portable X-ray equipments operating based on the cosα method using a two-dimensional detector, are appropriate for the measurement of the residual stresses at the manufacturing sites. Although it is known that carbon and alloy elements concentration influence X-ray stress measurement, there is little research about the influence of segregation in X-ray stress measurement using the cosα method. This study evaluated the differences in X-ray stress results using the cosα method in segregation regions of large forged products made of CrMo steel, under tensile stress. It was confirmed that the differences between the X-ray stress and nominal stress increased with increase of carbon concentration in segregation, and crystal grains in which coarse and fine grain size coexist worsen the linearity of the cosα diagram. Because the level of carbon concentration and grain size varies at each X-ray irradiation points, we proposed an averaging method of X-ray stresses on plural measurement points as an effective way to avoid the effect of segregation.
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Therefore, X-ray stress measurement is important to evaluate the fatigue strength of these materials. For large forged steel products, regions where alloy elements are segregated cannot be avoided. Furthermore, because of the large size of these products, it may be difficult to measure their residual stresses in a laboratory. Nevertheless, compact and portable X-ray equipments operating based on the cosα method using a two-dimensional detector, are appropriate for the measurement of the residual stresses at the manufacturing sites. Although it is known that carbon and alloy elements concentration influence X-ray stress measurement, there is little research about the influence of segregation in X-ray stress measurement using the cosα method. This study evaluated the differences in X-ray stress results using the cosα method in segregation regions of large forged products made of CrMo steel, under tensile stress. It was confirmed that the differences between the X-ray stress and nominal stress increased with increase of carbon concentration in segregation, and crystal grains in which coarse and fine grain size coexist worsen the linearity of the cosα diagram. Because the level of carbon concentration and grain size varies at each X-ray irradiation points, we proposed an averaging method of X-ray stresses on plural measurement points as an effective way to avoid the effect of segregation.</description><identifier>ISSN: 0514-5163</identifier><identifier>EISSN: 1880-7488</identifier><identifier>DOI: 10.2472/jsms.68.285</identifier><language>jpn</language><publisher>Kyoto: The Society of Materials Science, Japan</publisher><subject>Alloying elements ; Carbon ; Chromium molybdenum steels ; Fatigue strength ; Grain size ; Linearity ; Metal fatigue ; Residual stress ; Steel products ; Stress concentration ; Stress measurement ; Tensile stress ; X ray irradiation ; X ray stress measurement ; X-ray stress, cosα method, Forged steel, Surface treatment, Residual stress, Segregation</subject><ispartof>Journal of the Society of Materials Science, Japan, 2019/03/15, Vol.68(3), pp.285-291</ispartof><rights>2019 by The Society of Materials Science, Japan</rights><rights>Copyright Japan Science and Technology Agency 2019</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1877,4010,27900,27901,27902</link.rule.ids></links><search><creatorcontrib>MATSUDA, Mariko</creatorcontrib><creatorcontrib>KABUTOMORI, Tatsuhiko</creatorcontrib><creatorcontrib>TAKAMATSU, Hiroyuki</creatorcontrib><creatorcontrib>TAKASHIMA, Ichiro</creatorcontrib><creatorcontrib>SASAKI, Toshihiko</creatorcontrib><title>Influence of Segregation of a Large Forged Steel Product on X-Ray Stress Measurement by the Cosα Method</title><title>Journal of the Society of Materials Science, Japan</title><addtitle>J. Soc. Mat. Sci., Japan</addtitle><description>Surface treatments involving residual stresses are an effective method to increase the fatigue strength of forged steel products. Therefore, X-ray stress measurement is important to evaluate the fatigue strength of these materials. For large forged steel products, regions where alloy elements are segregated cannot be avoided. Furthermore, because of the large size of these products, it may be difficult to measure their residual stresses in a laboratory. Nevertheless, compact and portable X-ray equipments operating based on the cosα method using a two-dimensional detector, are appropriate for the measurement of the residual stresses at the manufacturing sites. Although it is known that carbon and alloy elements concentration influence X-ray stress measurement, there is little research about the influence of segregation in X-ray stress measurement using the cosα method. This study evaluated the differences in X-ray stress results using the cosα method in segregation regions of large forged products made of CrMo steel, under tensile stress. It was confirmed that the differences between the X-ray stress and nominal stress increased with increase of carbon concentration in segregation, and crystal grains in which coarse and fine grain size coexist worsen the linearity of the cosα diagram. 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Although it is known that carbon and alloy elements concentration influence X-ray stress measurement, there is little research about the influence of segregation in X-ray stress measurement using the cosα method. This study evaluated the differences in X-ray stress results using the cosα method in segregation regions of large forged products made of CrMo steel, under tensile stress. It was confirmed that the differences between the X-ray stress and nominal stress increased with increase of carbon concentration in segregation, and crystal grains in which coarse and fine grain size coexist worsen the linearity of the cosα diagram. Because the level of carbon concentration and grain size varies at each X-ray irradiation points, we proposed an averaging method of X-ray stresses on plural measurement points as an effective way to avoid the effect of segregation.</abstract><cop>Kyoto</cop><pub>The Society of Materials Science, Japan</pub><doi>10.2472/jsms.68.285</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record>
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subjects Alloying elements
Carbon
Chromium molybdenum steels
Fatigue strength
Grain size
Linearity
Metal fatigue
Residual stress
Steel products
Stress concentration
Stress measurement
Tensile stress
X ray irradiation
X ray stress measurement
X-ray stress, cosα method, Forged steel, Surface treatment, Residual stress, Segregation
title Influence of Segregation of a Large Forged Steel Product on X-Ray Stress Measurement by the Cosα Method
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