Proposition of the Observation Condition and of the Simple Method to Evaluate Initiation and Growth of Voids of Type IV Creep Damage in Mod. 9Cr-1Mo Steel
Type IV creep damage occurs in welded joints of high chromium steel in power plant. The method based on the number density of voids is one of the methods to evaluate the residual life. The observed number density of void depends on the observation condition; the observation area and the magnificatio...
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| Veröffentlicht in: | Journal of the Society of Materials Science, Japan Japan, 2017/02/15, Vol.66(2), pp.108-113 |
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| container_title | Journal of the Society of Materials Science, Japan |
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| creator | KAWASHIMA, Fumiko IRIE, Yoshitsugu MASUMISTU, Taishi SUEHIRO, Kazuaki NEGI, Katsuki WATANABE, Kei FUJIWARA, Kazuhito |
| description | Type IV creep damage occurs in welded joints of high chromium steel in power plant. The method based on the number density of voids is one of the methods to evaluate the residual life. The observed number density of void depends on the observation condition; the observation area and the magnification of observed photograph of metallographic structure. In previous study we had studied influence of them and had proposed how to determine the appropriate observation area for the temporary allowable error. In this paper we experimentally show that the appropriate area does not depend on heats or heat treatments. Next, we proposed the method to evaluate the start time of initiation of voids, the initiation rate of voids and the growth rate of voids. The relation of observed number density of voids and the magnification of observed photograph was experimentally taken. Based on it, the distribution of the radius of voids changing with creep time was evaluated. With it these parameters are evaluated. In the future influence of the stress triaxiality on these parameters will be studied. |
| doi_str_mv | 10.2472/jsms.66.108 |
| format | Article |
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The method based on the number density of voids is one of the methods to evaluate the residual life. The observed number density of void depends on the observation condition; the observation area and the magnification of observed photograph of metallographic structure. In previous study we had studied influence of them and had proposed how to determine the appropriate observation area for the temporary allowable error. In this paper we experimentally show that the appropriate area does not depend on heats or heat treatments. Next, we proposed the method to evaluate the start time of initiation of voids, the initiation rate of voids and the growth rate of voids. The relation of observed number density of voids and the magnification of observed photograph was experimentally taken. Based on it, the distribution of the radius of voids changing with creep time was evaluated. With it these parameters are evaluated. In the future influence of the stress triaxiality on these parameters will be studied.</description><identifier>ISSN: 0514-5163</identifier><identifier>EISSN: 1880-7488</identifier><identifier>DOI: 10.2472/jsms.66.108</identifier><language>eng ; jpn</language><publisher>Kyoto: The Society of Materials Science, Japan</publisher><subject>Axial stress ; Chromium molybdenum steels ; Chromium steel ; Chromium steels ; Creep (materials) ; Damage assessment ; Density ; Electric power generation ; Heat treatment ; Materials science ; Microstructure ; Mod. 9Cr-1Mo steel ; Observation ; Parameters ; Residual life ; Type IV creep damage ; Voids ; Welded joints</subject><ispartof>Journal of the Society of Materials Science, Japan, 2017/02/15, Vol.66(2), pp.108-113</ispartof><rights>2017 by The Society of Materials Science, Japan</rights><rights>Copyright Japan Science and Technology Agency 2017</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c2318-1c0b14bf0ea8b92eb8e30523aff387f054af9fd552c6e355cce1779afe672a073</citedby><cites>FETCH-LOGICAL-c2318-1c0b14bf0ea8b92eb8e30523aff387f054af9fd552c6e355cce1779afe672a073</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,1876,27903,27904</link.rule.ids></links><search><creatorcontrib>KAWASHIMA, Fumiko</creatorcontrib><creatorcontrib>IRIE, Yoshitsugu</creatorcontrib><creatorcontrib>MASUMISTU, Taishi</creatorcontrib><creatorcontrib>SUEHIRO, Kazuaki</creatorcontrib><creatorcontrib>NEGI, Katsuki</creatorcontrib><creatorcontrib>WATANABE, Kei</creatorcontrib><creatorcontrib>FUJIWARA, Kazuhito</creatorcontrib><title>Proposition of the Observation Condition and of the Simple Method to Evaluate Initiation and Growth of Voids of Type IV Creep Damage in Mod. 9Cr-1Mo Steel</title><title>Journal of the Society of Materials Science, Japan</title><addtitle>J. Soc. Mat. Sci., Japan</addtitle><description>Type IV creep damage occurs in welded joints of high chromium steel in power plant. The method based on the number density of voids is one of the methods to evaluate the residual life. The observed number density of void depends on the observation condition; the observation area and the magnification of observed photograph of metallographic structure. In previous study we had studied influence of them and had proposed how to determine the appropriate observation area for the temporary allowable error. In this paper we experimentally show that the appropriate area does not depend on heats or heat treatments. Next, we proposed the method to evaluate the start time of initiation of voids, the initiation rate of voids and the growth rate of voids. The relation of observed number density of voids and the magnification of observed photograph was experimentally taken. Based on it, the distribution of the radius of voids changing with creep time was evaluated. With it these parameters are evaluated. In the future influence of the stress triaxiality on these parameters will be studied.</description><subject>Axial stress</subject><subject>Chromium molybdenum steels</subject><subject>Chromium steel</subject><subject>Chromium steels</subject><subject>Creep (materials)</subject><subject>Damage assessment</subject><subject>Density</subject><subject>Electric power generation</subject><subject>Heat treatment</subject><subject>Materials science</subject><subject>Microstructure</subject><subject>Mod. 9Cr-1Mo steel</subject><subject>Observation</subject><subject>Parameters</subject><subject>Residual life</subject><subject>Type IV creep damage</subject><subject>Voids</subject><subject>Welded joints</subject><issn>0514-5163</issn><issn>1880-7488</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><recordid>eNpd0V9rFDEQAPAgCh61T36BgC-C7Jk_m2z2RZC11kKPCq19DdnsxMuxu1mTXEu_ip_WnFfvwafJZH4TwgxCbylZs7phH3dpSmsp15SoF2hFlSJVUyv1Eq2IoHUlqOSv0XlKvieEMcZV3a7Q7-8xLCH57MOMg8N5C_imTxAfzN-rLszDsWjm4R-49dMyAt5A3oYB54AvHsy4Nxnw1VywOfnLGB7z9tB2H_yQDoe7p6Wwe9xFgAV_MZP5CdjPeBOGNW67WNFNwLcZYHyDXjkzJjh_jmfox9eLu-5bdX1zedV9vq4s41RV1JKe1r0jYFTfMugVcCIYN85x1TgiauNaNwjBrAQuhLVAm6Y1DmTDDGn4GXp_fHeJ4dceUtaTTxbG0cwQ9klT1XKlaCtloe_-o7uwj3P5nS4DFZQTSkVRH47KxpBSBKeX6CcTnzQl-rAqfViVlrLkquhPR71LucziZE3M3o5wsuy54VSwWxM1zPwPVxed2w</recordid><startdate>20170101</startdate><enddate>20170101</enddate><creator>KAWASHIMA, Fumiko</creator><creator>IRIE, Yoshitsugu</creator><creator>MASUMISTU, Taishi</creator><creator>SUEHIRO, Kazuaki</creator><creator>NEGI, Katsuki</creator><creator>WATANABE, Kei</creator><creator>FUJIWARA, Kazuhito</creator><general>The Society of Materials Science, Japan</general><general>Japan Science and Technology Agency</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20170101</creationdate><title>Proposition of the Observation Condition and of the Simple Method to Evaluate Initiation and Growth of Voids of Type IV Creep Damage in Mod. 9Cr-1Mo Steel</title><author>KAWASHIMA, Fumiko ; IRIE, Yoshitsugu ; MASUMISTU, Taishi ; SUEHIRO, Kazuaki ; NEGI, Katsuki ; WATANABE, Kei ; FUJIWARA, Kazuhito</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c2318-1c0b14bf0ea8b92eb8e30523aff387f054af9fd552c6e355cce1779afe672a073</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng ; jpn</language><creationdate>2017</creationdate><topic>Axial stress</topic><topic>Chromium molybdenum steels</topic><topic>Chromium steel</topic><topic>Chromium steels</topic><topic>Creep (materials)</topic><topic>Damage assessment</topic><topic>Density</topic><topic>Electric power generation</topic><topic>Heat treatment</topic><topic>Materials science</topic><topic>Microstructure</topic><topic>Mod. 9Cr-1Mo steel</topic><topic>Observation</topic><topic>Parameters</topic><topic>Residual life</topic><topic>Type IV creep damage</topic><topic>Voids</topic><topic>Welded joints</topic><toplevel>online_resources</toplevel><creatorcontrib>KAWASHIMA, Fumiko</creatorcontrib><creatorcontrib>IRIE, Yoshitsugu</creatorcontrib><creatorcontrib>MASUMISTU, Taishi</creatorcontrib><creatorcontrib>SUEHIRO, Kazuaki</creatorcontrib><creatorcontrib>NEGI, Katsuki</creatorcontrib><creatorcontrib>WATANABE, Kei</creatorcontrib><creatorcontrib>FUJIWARA, Kazuhito</creatorcontrib><collection>CrossRef</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Journal of the Society of Materials Science, Japan</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>KAWASHIMA, Fumiko</au><au>IRIE, Yoshitsugu</au><au>MASUMISTU, Taishi</au><au>SUEHIRO, Kazuaki</au><au>NEGI, Katsuki</au><au>WATANABE, Kei</au><au>FUJIWARA, Kazuhito</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Proposition of the Observation Condition and of the Simple Method to Evaluate Initiation and Growth of Voids of Type IV Creep Damage in Mod. 9Cr-1Mo Steel</atitle><jtitle>Journal of the Society of Materials Science, Japan</jtitle><addtitle>J. Soc. Mat. Sci., Japan</addtitle><date>2017-01-01</date><risdate>2017</risdate><volume>66</volume><issue>2</issue><spage>108</spage><epage>113</epage><pages>108-113</pages><issn>0514-5163</issn><eissn>1880-7488</eissn><abstract>Type IV creep damage occurs in welded joints of high chromium steel in power plant. The method based on the number density of voids is one of the methods to evaluate the residual life. The observed number density of void depends on the observation condition; the observation area and the magnification of observed photograph of metallographic structure. In previous study we had studied influence of them and had proposed how to determine the appropriate observation area for the temporary allowable error. In this paper we experimentally show that the appropriate area does not depend on heats or heat treatments. Next, we proposed the method to evaluate the start time of initiation of voids, the initiation rate of voids and the growth rate of voids. The relation of observed number density of voids and the magnification of observed photograph was experimentally taken. Based on it, the distribution of the radius of voids changing with creep time was evaluated. With it these parameters are evaluated. In the future influence of the stress triaxiality on these parameters will be studied.</abstract><cop>Kyoto</cop><pub>The Society of Materials Science, Japan</pub><doi>10.2472/jsms.66.108</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of the Society of Materials Science, Japan, 2017/02/15, Vol.66(2), pp.108-113 |
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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese |
| subjects | Axial stress Chromium molybdenum steels Chromium steel Chromium steels Creep (materials) Damage assessment Density Electric power generation Heat treatment Materials science Microstructure Mod. 9Cr-1Mo steel Observation Parameters Residual life Type IV creep damage Voids Welded joints |
| title | Proposition of the Observation Condition and of the Simple Method to Evaluate Initiation and Growth of Voids of Type IV Creep Damage in Mod. 9Cr-1Mo Steel |
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