首页|Improving Fatigue Properties of 316L Stainless Steel Welded Joints by Surface Spinning Strengthening

Improving Fatigue Properties of 316L Stainless Steel Welded Joints by Surface Spinning Strengthening

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The surface spinning strengthening(3S)mechanism and fatigue life extension mechanism of 316L stainless steel welded joint were systematically elucidated by microstructural analyses and mechanical tests.Results indicate that surface gradient hardening layer of approximately 1 mm is formed in the base material through grain fragmentation and deformation twin strengthening,as well as in the welding zone composed of deformed 6-phases and nanotwins.The fatigue strength of welded joint after 3S significantly rises by 32％(from 190 to 250 MPa),which is attributed to the effective elimination of surface geometric defects,discrete refinement of 6-Fe phases and the appropriate improvement in the surface strength,collectively mitigating strain localization and surface fatigue damage within the gradient strengthening layer.The redistributed fine δ-Fe phases benefited by strong stress transfer of 3S reduce the risk of surface weak phase cracking,causing the fatigue fracture to transition from microstructure defects to crystal defects dominated by slip,further suppressing the initiation and early propagation of fatigue cracks.

316L stainless steelWelded jointSurface spinning strengtheningNanotwinFatigue life

Dongqiqiong Wang、Qiang Wang、Xiaowu Li、Zhefeng Zhang

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Department of Materials Physics and Chemistry,School of Materials Science and Engineering,and Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China

Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

College of Light Industry,Liaoning University,Shenyang 110036,China

science and Technology Cooperation Project between Jilin Province and Chinese Academy of SciencesFundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Liaoning Revitalization Talents Program

2020SYHZ0017N2202003521000035217110852321001XLYC1808027

2024

10.1007/s40195-024-01668-2

金属学报(英文版)
中国金属学会

金属学报(英文版)

CSTPCD
影响因子：0.77
ISSN：1006-7191
年,卷(期)：2024.37(5)
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