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Fatigue performance tests of Mn25Al7 steel welded joints
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Yu ZHANG1, Jun LI1, Jun ZHOU2, Wei CHEN1, Wei SHEN1, Xiao-bin LI1
Journal of Ship Mechanics | 2024, 28(7) : 1100 - 1110
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Journal of Ship Mechanics | 2024, 28(7): 1100-1110
• Structural Mechanics •
Fatigue performance tests of Mn25Al7 steel welded joints
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Yu ZHANG1, Jun LI1, Jun ZHOU2, Wei CHEN1, Wei SHEN1, Xiao-bin LI1
Affiliations
  • 1.School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, China
  • 2.China Ship Research and Design Center, Wuhan 430064, China
Published: 2024-07-20 doi: 10.3969/j.issn.1007-7294.2024.07.013
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Mn25Al7 steel is a new type of lightweight and high-strength marine steel, and the fatigue properties of Mn25Al7 steel have not been studied in relevant experiments. In this paper, the fatigue tests of typical nodes such as base metal, butt welded joint and T-welded joint of Mn25Al7 steel were carried out, and the fatigue grade curve of the typical nodes was obtained based on the nominal stress method and the hot stress method, respectively, and compared with the fatigue grade curve of the existing standard. The fracture morphology of the three samples was observed, and the crack propagation law and fracture mechanism were analyzed. The test results show that the fatigue life of Mn25Al7 steel base metal is higher than that of ordinary steel designed by the specification. The specification underestimates the fatigue life of butt weld joints of base metal and smoothed toes, but can accurately evaluate the fatigue life of T-weld joints. By comparing and analyzing the difference in damage rate of the three specimens, the fracture morphology was further systematically analyzed. It is found that the initial crack source and welding residue will reduce the fatigue strength. This study can provide a theoretical basis and experimental support for the prediction of fatigue life of marine high-strength steel.

high-strength steel  /  fatigue assessment  /  welded joint  /  fracture analysis  /  fatigue test
Yu ZHANG, Jun LI, Jun ZHOU, Wei CHEN, Wei SHEN, Xiao-bin LI. Fatigue performance tests of Mn25Al7 steel welded joints[J]. Journal of Ship Mechanics, 2024 , 28 (7) : 1100 -1110 . DOI: 10.3969/j.issn.1007-7294.2024.07.013
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Article Info
doi: 10.3969/j.issn.1007-7294.2024.07.013
  • Receive Date：2024-01-17
  • Online Date：2026-03-26
  • Published：2024-07-20
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  • Received：2024-01-17
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Affiliations
    1.School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, China
    2.China Ship Research and Design Center, Wuhan 430064, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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