High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method
An overlay welding is widely employed to repair damaged components in aged thermal power plants. However, the overlay welding causes heat-affected zone and tensile residual stress which reduce the high-temperature strength of these components. Our research group has reported that a thermal spray tec...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | Japanese |
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The Japan Society of Mechanical Engineers
2021-05-01
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| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/87/898/87_21-00092/_pdf/-char/en |
| _version_ | 1811220757224620032 |
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| author | Kiyohiro ITO Kenji INADA Masayuki ARAI Tatsuya FUKUSHI Hiroki YOKOTA Tatsuo SUIDZU |
| author_facet | Kiyohiro ITO Kenji INADA Masayuki ARAI Tatsuya FUKUSHI Hiroki YOKOTA Tatsuo SUIDZU |
| author_sort | Kiyohiro ITO |
| collection | DOAJ |
| description | An overlay welding is widely employed to repair damaged components in aged thermal power plants. However, the overlay welding causes heat-affected zone and tensile residual stress which reduce the high-temperature strength of these components. Our research group has reported that a thermal spray technique can reduce the residual stress, while the bonding strength of the repaired part needs to be improved. This study is focusing on a laser metal deposition (LMD) technique as a repairing technique of the damaged component. In order to identify the high-temperature strength of an austenitic stainless steel repaired by LMD, a tensile test and a fatigue test were conducted at 873 K. The tensile test revealed that the repaired part was not delaminated from the base material until rupture, moreover, the yield stress of the specimen repaired by LMD (LMD specimen) is significantly higher than that of the non-repaired specimen. In contrast, it was found that the fatigue strength of the LMD specimen was lower than that of the non-repaired specimen. A fatigue test using LMD specimens without tapered area in the parallel part and a finite element analysis revealed that the low fatigue strength of the LMD specimen is attributed to the residual stress concentrated at the tapered area in the repaired part. The finite element analysis also indicated that the cutting angle of less than 15 leads to the residual stress of less than 100 MPa normal to the LMD/base material interface. |
| first_indexed | 2024-04-12T07:47:58Z |
| format | Article |
| id | doaj.art-a1bb18d2367749718b18766187399efa |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T07:47:58Z |
| publishDate | 2021-05-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-a1bb18d2367749718b18766187399efa2022-12-22T03:41:40ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612021-05-018789821-0009221-0009210.1299/transjsme.21-00092transjsmeHigh-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition methodKiyohiro ITO0Kenji INADA1Masayuki ARAI2Tatsuya FUKUSHI3Hiroki YOKOTA4Tatsuo SUIDZU5Department of Mechanical Engineering, Tokyo University of ScienceGraduate School of Mechanical Engineering, Tokyo University of ScienceDepartment of Mechanical Engineering, Tokyo University of ScienceThermal Spraying Technology R&D Laboratories, TOCALO Co., Ltd.Thermal Spraying Technology R&D Laboratories, TOCALO Co., Ltd.Thermal Spraying Technology R&D Laboratories, TOCALO Co., Ltd.An overlay welding is widely employed to repair damaged components in aged thermal power plants. However, the overlay welding causes heat-affected zone and tensile residual stress which reduce the high-temperature strength of these components. Our research group has reported that a thermal spray technique can reduce the residual stress, while the bonding strength of the repaired part needs to be improved. This study is focusing on a laser metal deposition (LMD) technique as a repairing technique of the damaged component. In order to identify the high-temperature strength of an austenitic stainless steel repaired by LMD, a tensile test and a fatigue test were conducted at 873 K. The tensile test revealed that the repaired part was not delaminated from the base material until rupture, moreover, the yield stress of the specimen repaired by LMD (LMD specimen) is significantly higher than that of the non-repaired specimen. In contrast, it was found that the fatigue strength of the LMD specimen was lower than that of the non-repaired specimen. A fatigue test using LMD specimens without tapered area in the parallel part and a finite element analysis revealed that the low fatigue strength of the LMD specimen is attributed to the residual stress concentrated at the tapered area in the repaired part. The finite element analysis also indicated that the cutting angle of less than 15 leads to the residual stress of less than 100 MPa normal to the LMD/base material interface.https://www.jstage.jst.go.jp/article/transjsme/87/898/87_21-00092/_pdf/-char/enlesar metal depositionrepairhigh-temperature strengthfatiguestainless steel |
| spellingShingle | Kiyohiro ITO Kenji INADA Masayuki ARAI Tatsuya FUKUSHI Hiroki YOKOTA Tatsuo SUIDZU High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method Nihon Kikai Gakkai ronbunshu lesar metal deposition repair high-temperature strength fatigue stainless steel |
| title | High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method |
| title_full | High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method |
| title_fullStr | High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method |
| title_full_unstemmed | High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method |
| title_short | High-temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method |
| title_sort | high temperature tensile and fatigue strength properties of stainless steel repaired by laser metal deposition method |
| topic | lesar metal deposition repair high-temperature strength fatigue stainless steel |
| url | https://www.jstage.jst.go.jp/article/transjsme/87/898/87_21-00092/_pdf/-char/en |
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