Electron microscopy and microanalysis of steel weld joints after long time exposures at high temperatures
The structural changes of three trial weld joints of creep resistant modified 9Cr-1Mo steels and low alloyed chromium steel after post-weld heat treatment and long-term creep tests were investigated. Smooth cross-weld specimens ruptured in different zones of the weld joints as a result of different...
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| Veröffentlicht in: | IOP conference series. Materials Science and Engineering 2010-02, Vol.7 (1), p.012012-012012 |
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| creator | Jandová, D Kasl, J Rek, A |
| description | The structural changes of three trial weld joints of creep resistant modified 9Cr-1Mo steels and low alloyed chromium steel after post-weld heat treatment and long-term creep tests were investigated. Smooth cross-weld specimens ruptured in different zones of the weld joints as a result of different structural changes taking place during creep exposures. The microstructure of the weld joint is heterogeneous and consequently microstructural development can be different in the weld metal, the heat affected zone, and the base material. Precipitation reactions, nucleation and growth of some particles and dissolution of others, affect the strengthening of the matrix, recovery at high temperatures, and the resulting creep resistance. Therefore, a detailed study of secondary phase's development in individual zones of weld joints can elucidate mechanism of cracks propagation in specific regions and the causes of creep failure. Type I and II fractures in the weld metal and Type IV fractures in the fine prior austenite grain heat affected zones occurred after creep tests at temperatures ranging from 525 to 625 °C and under stresses from 40 to 240 MPa. An extended metallographic study of the weld joints was carried out using scanning and transmission electron microscopy, energy-dispersive and wave-dispersive X-ray microanalysis. Carbon extraction replicas and thin foils were prepared from individual weld joint regions and quantitative evaluation of dislocation substructure and particles of secondary phases has been performed. |
| doi_str_mv | 10.1088/1757-899X/7/1/012012 |
| format | Article |
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Smooth cross-weld specimens ruptured in different zones of the weld joints as a result of different structural changes taking place during creep exposures. The microstructure of the weld joint is heterogeneous and consequently microstructural development can be different in the weld metal, the heat affected zone, and the base material. Precipitation reactions, nucleation and growth of some particles and dissolution of others, affect the strengthening of the matrix, recovery at high temperatures, and the resulting creep resistance. Therefore, a detailed study of secondary phase's development in individual zones of weld joints can elucidate mechanism of cracks propagation in specific regions and the causes of creep failure. Type I and II fractures in the weld metal and Type IV fractures in the fine prior austenite grain heat affected zones occurred after creep tests at temperatures ranging from 525 to 625 °C and under stresses from 40 to 240 MPa. An extended metallographic study of the weld joints was carried out using scanning and transmission electron microscopy, energy-dispersive and wave-dispersive X-ray microanalysis. Carbon extraction replicas and thin foils were prepared from individual weld joint regions and quantitative evaluation of dislocation substructure and particles of secondary phases has been performed.</description><identifier>ISSN: 1757-899X</identifier><identifier>ISSN: 1757-8981</identifier><identifier>EISSN: 1757-899X</identifier><identifier>DOI: 10.1088/1757-899X/7/1/012012</identifier><language>eng</language><publisher>Bristol: IOP Publishing</publisher><subject>Alloying ; Chemical precipitation ; Chromium molybdenum steels ; Chromium steel ; Chromium steels ; Crack propagation ; Creep (materials) ; Creep strength ; Creep tests ; Electron microscopy ; Foils ; Fracture mechanics ; Fractures ; Heat affected zone ; Heat treating ; High temperature ; Low alloy steels ; Microscopy ; Microstructure ; Nucleation ; Post-weld heat treatment ; Scanning electron microscopy ; Wave dispersion ; Weld metal ; Welded joints</subject><ispartof>IOP conference series. 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Materials Science and Engineering</title><description>The structural changes of three trial weld joints of creep resistant modified 9Cr-1Mo steels and low alloyed chromium steel after post-weld heat treatment and long-term creep tests were investigated. Smooth cross-weld specimens ruptured in different zones of the weld joints as a result of different structural changes taking place during creep exposures. The microstructure of the weld joint is heterogeneous and consequently microstructural development can be different in the weld metal, the heat affected zone, and the base material. Precipitation reactions, nucleation and growth of some particles and dissolution of others, affect the strengthening of the matrix, recovery at high temperatures, and the resulting creep resistance. Therefore, a detailed study of secondary phase's development in individual zones of weld joints can elucidate mechanism of cracks propagation in specific regions and the causes of creep failure. Type I and II fractures in the weld metal and Type IV fractures in the fine prior austenite grain heat affected zones occurred after creep tests at temperatures ranging from 525 to 625 °C and under stresses from 40 to 240 MPa. An extended metallographic study of the weld joints was carried out using scanning and transmission electron microscopy, energy-dispersive and wave-dispersive X-ray microanalysis. Carbon extraction replicas and thin foils were prepared from individual weld joint regions and quantitative evaluation of dislocation substructure and particles of secondary phases has been performed.</description><subject>Alloying</subject><subject>Chemical precipitation</subject><subject>Chromium molybdenum steels</subject><subject>Chromium steel</subject><subject>Chromium steels</subject><subject>Crack propagation</subject><subject>Creep (materials)</subject><subject>Creep strength</subject><subject>Creep tests</subject><subject>Electron microscopy</subject><subject>Foils</subject><subject>Fracture mechanics</subject><subject>Fractures</subject><subject>Heat affected zone</subject><subject>Heat treating</subject><subject>High temperature</subject><subject>Low alloy steels</subject><subject>Microscopy</subject><subject>Microstructure</subject><subject>Nucleation</subject><subject>Post-weld heat treatment</subject><subject>Scanning electron microscopy</subject><subject>Wave dispersion</subject><subject>Weld metal</subject><subject>Welded joints</subject><issn>1757-899X</issn><issn>1757-8981</issn><issn>1757-899X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqNkE1LxDAQhosouK7-Aw8BDx6kNknTjxxlWT9gwYuCt5BNJ7tZ2qYmKbr_3paKiOxBCCQzed6BeaLokuBbgssyIUVWxCXnb0mRkAQTOpyjaPbTPv71Po3OvN9hnBeM4VlkljWo4GyLGqOc9cp2eyTbaiplK-u9Nx5ZjXwAqNEH1BXaWdMGj6QO4FBt2w0KpgEEn531vYPhJ6Ct2WxRgKYDJ8PYPI9OtKw9XHzf8-j1fvmyeIxXzw9Pi7tVrFJShLhaEwZrnBKpGZOgK8U4zRVollNeMsxAawoKVzwbeFKtM64gpTSTsFac83QeXU9zO2ffe_BBNMYrqGvZgu29KLOswHTYfyCv_pA727thZS9olhOa0bxMB4pN1KjHO9Cic6aRbi8IFqN-MboVo1tRCCIm_UMsmWLGdv9N3BxIHCBFV-n0C3Yqlkw</recordid><startdate>20100201</startdate><enddate>20100201</enddate><creator>Jandová, D</creator><creator>Kasl, J</creator><creator>Rek, A</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>HCIFZ</scope><scope>KB.</scope><scope>L6V</scope><scope>M7S</scope><scope>PDBOC</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope><scope>PTHSS</scope><scope>7SR</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20100201</creationdate><title>Electron microscopy and microanalysis of steel weld joints after long time exposures at high temperatures</title><author>Jandová, D ; Kasl, J ; Rek, A</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c317t-db14eb031af44aefdc4926cef46298404eff2ec0d953171db59ce3225aebc9993</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Alloying</topic><topic>Chemical precipitation</topic><topic>Chromium molybdenum steels</topic><topic>Chromium steel</topic><topic>Chromium steels</topic><topic>Crack propagation</topic><topic>Creep (materials)</topic><topic>Creep strength</topic><topic>Creep tests</topic><topic>Electron microscopy</topic><topic>Foils</topic><topic>Fracture mechanics</topic><topic>Fractures</topic><topic>Heat affected zone</topic><topic>Heat treating</topic><topic>High temperature</topic><topic>Low alloy steels</topic><topic>Microscopy</topic><topic>Microstructure</topic><topic>Nucleation</topic><topic>Post-weld heat treatment</topic><topic>Scanning electron microscopy</topic><topic>Wave dispersion</topic><topic>Weld metal</topic><topic>Welded joints</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jandová, D</creatorcontrib><creatorcontrib>Kasl, J</creatorcontrib><creatorcontrib>Rek, A</creatorcontrib><collection>CrossRef</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni)</collection><collection>ProQuest Central</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>ProQuest Engineering Collection</collection><collection>Engineering Database</collection><collection>Materials Science Collection</collection><collection>Publicly Available Content Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>Engineering Collection</collection><collection>Engineered Materials Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>IOP conference series. 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Smooth cross-weld specimens ruptured in different zones of the weld joints as a result of different structural changes taking place during creep exposures. The microstructure of the weld joint is heterogeneous and consequently microstructural development can be different in the weld metal, the heat affected zone, and the base material. Precipitation reactions, nucleation and growth of some particles and dissolution of others, affect the strengthening of the matrix, recovery at high temperatures, and the resulting creep resistance. Therefore, a detailed study of secondary phase's development in individual zones of weld joints can elucidate mechanism of cracks propagation in specific regions and the causes of creep failure. Type I and II fractures in the weld metal and Type IV fractures in the fine prior austenite grain heat affected zones occurred after creep tests at temperatures ranging from 525 to 625 °C and under stresses from 40 to 240 MPa. An extended metallographic study of the weld joints was carried out using scanning and transmission electron microscopy, energy-dispersive and wave-dispersive X-ray microanalysis. Carbon extraction replicas and thin foils were prepared from individual weld joint regions and quantitative evaluation of dislocation substructure and particles of secondary phases has been performed.</abstract><cop>Bristol</cop><pub>IOP Publishing</pub><doi>10.1088/1757-899X/7/1/012012</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| source | Institute of Physics Open Access Journal Titles |
| subjects | Alloying Chemical precipitation Chromium molybdenum steels Chromium steel Chromium steels Crack propagation Creep (materials) Creep strength Creep tests Electron microscopy Foils Fracture mechanics Fractures Heat affected zone Heat treating High temperature Low alloy steels Microscopy Microstructure Nucleation Post-weld heat treatment Scanning electron microscopy Wave dispersion Weld metal Welded joints |
| title | Electron microscopy and microanalysis of steel weld joints after long time exposures at high temperatures |
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