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Effects of Weaving Laser on weld microstructure and Crack for Al 6k21-T4 Alloy

Journal of Materials Science & Technology 2011年第1期27卷 93-96页

作者： B.H.Kim N.H.Kang W.T.Oh C.H.Kim J.H.Kim Y.S.Kim Y.H.Park Department of Materials Science and Engineering Pusan National UniversitySan30Jangjeon-dongGeumjeong-guBusan 609-735Korea Department of Materials and Components Engineering Dong-Eui UniversityBusan 614-714Korea Advanced Joining Technology Team KITECH7-47Songdo-dongYeonsu-guIncheon 406-840Korea Division for Dongnam Area Technology Service KITECHJisa-dongGanseo-guBusan 618-230Korea

For Al 6k21-T4 overlap weld joint,the shear-tensile strength by using the weaving laser was improved as compared to the case of linear *** the specimen of low strength,the porosity was distributed continuously along the intersection between the plates and fusion ***,for the optimized welding condition,large oval-shaped porosities were located only in the advancing track of the concave ***,the continuity of cracks and porosities played a key role to determine the ***,the weaving width was also the important parameter to control the ***,the concave part had more significant hot and cold cracking in the weld and heat-affected zone（HAZ）,respectively,than the convex part.

关键词： Weaving laser weld microstructure Void Al alloy

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Effect of weld microstructure on brittle fracture initiation in the thermallyaged boiling water reactor pressure vessel head weld metal

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International Journal of Minerals,Metallurgy and Materials 2021年第5期28卷 867-876页

作者： Noora Hytönen Zai-qing Que Pentti Arffman Jari Lydman Pekka Nevasmaa Ulla Ehrnstén Pål Efsing Nuclear Reactor Materials VTT Technical Research Centre of Finland Ltd.Kivimiehentie 3P.O.Box 1000FI-02044 VTTFinland Department of Solid Mechanics Royal Institute of Technology(KTH)SE-10044 StockholmSweden

Effects of the weld microstructure and inclusions on brittle fracture initiation are investigated in a thermally aged ferritic high-nickel weld of a reactor pressure vessel head from a decommissioned nuclear power ***-welded and reheated regions mainly consist of acicular and polygonal ferrite,*** examination of Charpy V-notch impact toughness specimens reveals large inclusions(0.5-2.5μm)at the brittle fracture primary initiation *** impact energies were measured for the specimens in which brittle fracture was initiated from a small inclusion or an inclusion away from the *** density,geometry,and chemical composition of the primary initiation inclusions were investigated.A brittle fracture crack initiates as a microcrack either within the multiphase oxide inclusions or from the debonded interfaces between the uncracked inclusions and weld metal *** fracture sites can be determined in all the specimens tested in the lower part of the transition curve at and below the 41-J reference impact toughness energy but not above the mentioned value because of the changes in the fracture mechanism and resulting changes in the fracture appearance.

关键词： reactor pressure vessel brittle fracture weld microstructure thermal aging

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