Fatigue life estimation of pitted 12% Cr steam turbine blade steel in different environments and at different stress ratios
The influence of corrosion pits on the endurable fatigue loading in different environments and at various stress ratios has been investigated for 12% Cr steam turbine blade steel. Very high cycle fatigue measurements were performed using ultrasonic fatigue testing technique with superimposed static...
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| Veröffentlicht in: | International journal of fatigue 2014-08, Vol.65, p.33-43 |
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| container_title | International journal of fatigue |
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| creator | Schönbauer, Bernd M. Stanzl-Tschegg, Stefanie E. Perlega, Andrea Salzman, Ronald N. Rieger, Neville F. Zhou, Shengqi Turnbull, Alan Gandy, David |
| description | The influence of corrosion pits on the endurable fatigue loading in different environments and at various stress ratios has been investigated for 12% Cr steam turbine blade steel. Very high cycle fatigue measurements were performed using ultrasonic fatigue testing technique with superimposed static load at stress ratios ranging from R=0.05 to R=0.9. Fatigue crack growth rate (FCGR) measurements in the near threshold regime and S–N tests were conducted at a temperature of 90°C in air, de-aerated 300ppbCl− solution and aerated 6ppmCl− solution. The influence of corrosion pits on the fatigue limit was determined with artificially generated corrosion pits. It was found that the FCGRs in solution are lower and the threshold stress intensity factor ranges ΔKth are higher than in air. Fracture surface investigation with scanning electron microscope and roughness measurement were made which suggest oxide and roughness induced crack closure as the most appropriate explanation. Data evaluation of fatigue life tests with pre-pitted specimens supports the applicability of treating pits as effective cracks. An estimation for the stress intensity factor range of pits which allows determining the endurable fatigue loading was empirically found. |
| doi_str_mv | 10.1016/j.ijfatigue.2013.10.003 |
| format | Article |
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Very high cycle fatigue measurements were performed using ultrasonic fatigue testing technique with superimposed static load at stress ratios ranging from R=0.05 to R=0.9. Fatigue crack growth rate (FCGR) measurements in the near threshold regime and S–N tests were conducted at a temperature of 90°C in air, de-aerated 300ppbCl− solution and aerated 6ppmCl− solution. The influence of corrosion pits on the fatigue limit was determined with artificially generated corrosion pits. It was found that the FCGRs in solution are lower and the threshold stress intensity factor ranges ΔKth are higher than in air. Fracture surface investigation with scanning electron microscope and roughness measurement were made which suggest oxide and roughness induced crack closure as the most appropriate explanation. Data evaluation of fatigue life tests with pre-pitted specimens supports the applicability of treating pits as effective cracks. An estimation for the stress intensity factor range of pits which allows determining the endurable fatigue loading was empirically found.</description><identifier>ISSN: 0142-1123</identifier><identifier>EISSN: 1879-3452</identifier><identifier>DOI: 10.1016/j.ijfatigue.2013.10.003</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>12% Cr steam turbine blade steel ; Chromium ; Corrosion ; Corrosion fatigue ; Fatigue (materials) ; Fatigue crack growth rate ; Kitagawa–Takahashi diagram ; Pits ; Pitting corrosion ; Roughness ; Scanning electron microscopy ; Stress ratio ; Very high cycle fatigue</subject><ispartof>International journal of fatigue, 2014-08, Vol.65, p.33-43</ispartof><rights>2013 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c447t-e0976e053b165400dda6ad1d3115a2564484248b0810fe429a1f14514efb09583</citedby><cites>FETCH-LOGICAL-c447t-e0976e053b165400dda6ad1d3115a2564484248b0810fe429a1f14514efb09583</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ijfatigue.2013.10.003$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Schönbauer, Bernd M.</creatorcontrib><creatorcontrib>Stanzl-Tschegg, Stefanie E.</creatorcontrib><creatorcontrib>Perlega, Andrea</creatorcontrib><creatorcontrib>Salzman, Ronald N.</creatorcontrib><creatorcontrib>Rieger, Neville F.</creatorcontrib><creatorcontrib>Zhou, Shengqi</creatorcontrib><creatorcontrib>Turnbull, Alan</creatorcontrib><creatorcontrib>Gandy, David</creatorcontrib><title>Fatigue life estimation of pitted 12% Cr steam turbine blade steel in different environments and at different stress ratios</title><title>International journal of fatigue</title><description>The influence of corrosion pits on the endurable fatigue loading in different environments and at various stress ratios has been investigated for 12% Cr steam turbine blade steel. Very high cycle fatigue measurements were performed using ultrasonic fatigue testing technique with superimposed static load at stress ratios ranging from R=0.05 to R=0.9. Fatigue crack growth rate (FCGR) measurements in the near threshold regime and S–N tests were conducted at a temperature of 90°C in air, de-aerated 300ppbCl− solution and aerated 6ppmCl− solution. The influence of corrosion pits on the fatigue limit was determined with artificially generated corrosion pits. It was found that the FCGRs in solution are lower and the threshold stress intensity factor ranges ΔKth are higher than in air. Fracture surface investigation with scanning electron microscope and roughness measurement were made which suggest oxide and roughness induced crack closure as the most appropriate explanation. Data evaluation of fatigue life tests with pre-pitted specimens supports the applicability of treating pits as effective cracks. An estimation for the stress intensity factor range of pits which allows determining the endurable fatigue loading was empirically found.</description><subject>12% Cr steam turbine blade steel</subject><subject>Chromium</subject><subject>Corrosion</subject><subject>Corrosion fatigue</subject><subject>Fatigue (materials)</subject><subject>Fatigue crack growth rate</subject><subject>Kitagawa–Takahashi diagram</subject><subject>Pits</subject><subject>Pitting corrosion</subject><subject>Roughness</subject><subject>Scanning electron microscopy</subject><subject>Stress ratio</subject><subject>Very high cycle fatigue</subject><issn>0142-1123</issn><issn>1879-3452</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNqFUU1r3DAQFSWFbtL-hupSyMXbGVmy7GNYkrQQyCU9C9kaFS1eeStpA6V_PjIbQm85zfA-Zph5jH1F2CJg932_DXtvS_h9oq0AbCu6BWg_sA32emhaqcQF2wBK0SCK9hO7zHkPAANotWH_7s5WPgdPnHIJhwoskS-eH0Mp5DiKb3yXeC5kD7yc0hgi8XG2jlaMZh4id8F7ShQLp_gc0hIPtc_cRsdt-Y_NJVHOPK078mf20ds505fXesV-3d0-7X40D4_3P3c3D80kpS4NwaA7AtWO2CkJ4JztrEPXIiorVCdlL4XsR-gRPEkxWPQoFUryIwyqb6_Y9XnuMS1_TvVGcwh5onm2kZZTNthpPQxSqeF9qeo0aAFSVak-S6e05JzIm2Oqz0t_DYJZkzF785aMWZNZiZpMdd6cnVSPfg6UTJ4CxYlcSDQV45bw7owX17ObVA</recordid><startdate>20140801</startdate><enddate>20140801</enddate><creator>Schönbauer, Bernd M.</creator><creator>Stanzl-Tschegg, Stefanie E.</creator><creator>Perlega, Andrea</creator><creator>Salzman, Ronald N.</creator><creator>Rieger, Neville F.</creator><creator>Zhou, Shengqi</creator><creator>Turnbull, Alan</creator><creator>Gandy, David</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SE</scope><scope>7SR</scope><scope>7TB</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20140801</creationdate><title>Fatigue life estimation of pitted 12% Cr steam turbine blade steel in different environments and at different stress ratios</title><author>Schönbauer, Bernd M. ; Stanzl-Tschegg, Stefanie E. ; Perlega, Andrea ; Salzman, Ronald N. ; Rieger, Neville F. ; Zhou, Shengqi ; Turnbull, Alan ; Gandy, David</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c447t-e0976e053b165400dda6ad1d3115a2564484248b0810fe429a1f14514efb09583</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>12% Cr steam turbine blade steel</topic><topic>Chromium</topic><topic>Corrosion</topic><topic>Corrosion fatigue</topic><topic>Fatigue (materials)</topic><topic>Fatigue crack growth rate</topic><topic>Kitagawa–Takahashi diagram</topic><topic>Pits</topic><topic>Pitting corrosion</topic><topic>Roughness</topic><topic>Scanning electron microscopy</topic><topic>Stress ratio</topic><topic>Very high cycle fatigue</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Schönbauer, Bernd M.</creatorcontrib><creatorcontrib>Stanzl-Tschegg, Stefanie E.</creatorcontrib><creatorcontrib>Perlega, Andrea</creatorcontrib><creatorcontrib>Salzman, Ronald N.</creatorcontrib><creatorcontrib>Rieger, Neville F.</creatorcontrib><creatorcontrib>Zhou, Shengqi</creatorcontrib><creatorcontrib>Turnbull, Alan</creatorcontrib><creatorcontrib>Gandy, David</creatorcontrib><collection>CrossRef</collection><collection>Corrosion Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>International journal of fatigue</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Schönbauer, Bernd M.</au><au>Stanzl-Tschegg, Stefanie E.</au><au>Perlega, Andrea</au><au>Salzman, Ronald N.</au><au>Rieger, Neville F.</au><au>Zhou, Shengqi</au><au>Turnbull, Alan</au><au>Gandy, David</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Fatigue life estimation of pitted 12% Cr steam turbine blade steel in different environments and at different stress ratios</atitle><jtitle>International journal of fatigue</jtitle><date>2014-08-01</date><risdate>2014</risdate><volume>65</volume><spage>33</spage><epage>43</epage><pages>33-43</pages><issn>0142-1123</issn><eissn>1879-3452</eissn><abstract>The influence of corrosion pits on the endurable fatigue loading in different environments and at various stress ratios has been investigated for 12% Cr steam turbine blade steel. Very high cycle fatigue measurements were performed using ultrasonic fatigue testing technique with superimposed static load at stress ratios ranging from R=0.05 to R=0.9. Fatigue crack growth rate (FCGR) measurements in the near threshold regime and S–N tests were conducted at a temperature of 90°C in air, de-aerated 300ppbCl− solution and aerated 6ppmCl− solution. The influence of corrosion pits on the fatigue limit was determined with artificially generated corrosion pits. It was found that the FCGRs in solution are lower and the threshold stress intensity factor ranges ΔKth are higher than in air. Fracture surface investigation with scanning electron microscope and roughness measurement were made which suggest oxide and roughness induced crack closure as the most appropriate explanation. Data evaluation of fatigue life tests with pre-pitted specimens supports the applicability of treating pits as effective cracks. An estimation for the stress intensity factor range of pits which allows determining the endurable fatigue loading was empirically found.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.ijfatigue.2013.10.003</doi><tpages>11</tpages></addata></record> |
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| ispartof | International journal of fatigue, 2014-08, Vol.65, p.33-43 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | 12% Cr steam turbine blade steel Chromium Corrosion Corrosion fatigue Fatigue (materials) Fatigue crack growth rate Kitagawa–Takahashi diagram Pits Pitting corrosion Roughness Scanning electron microscopy Stress ratio Very high cycle fatigue |
| title | Fatigue life estimation of pitted 12% Cr steam turbine blade steel in different environments and at different stress ratios |
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