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, fatigue striation and dimple, and numerous secondary cracks are observed.Key words:5A06 aluminum alloy; welded joint; fatigue fracture; secondary crack...微观断口具有准解理特征,断口中存在球状孔洞,疲劳条纹和韧窝,并存在二次裂纹.关键词:5A06铝合金;焊接接头;疲劳断口;二次裂纹Fatigue fracture behavior of 5A06 aluminum alloy and its welded jointZHANG Hong-xia, WU Guang-he, YAN Zhi-feng, PEI Fei-fei, LI Jin-yong......
;7075铝合金焊接头在不同焊后处理下力学性能数据平均值 Table 2 Average data of mechanical properties of 7075 Al alloy welded joint with different post-weld treatments 2.4.2 拉伸断口分析 图8所示为未处理焊接头的断口形貌SEM像. 图8 未处理焊接头的断口形貌 Fig. 8 SEM images showing tensile fracture surfaces of welded joint without treatment 其中图8(a)所示为宏观断口图,可以看出未处理焊接头的裂纹起始源在材料表面,断口表层没有剪切唇.如图8(b)所示,由于焊缝存在气孔,焊接杂质等缺陷,晶粒粗大,晶界强度低, 脆性大,故断裂模式属于以脆性断......
structure growing in HAZ and strengthen the weldment together with dislocations in the welded joint.关键词:...Microstructure Characterization of High-heat-input Welding Joint of HSLA Steel Plate for Oil Storage ConstructionWeihua Sun 1,2)? , Guodong Wang 1) , Jiming Zhang 2) , Dianxiu Xia 2) and Hao Sun 2) 1......
J. Cent. South Univ. (2019) 26: 3103-3113 DOI: https://doi.org/10.1007/s11771-019-4239-8 Fourier-shape-based reconstruction of rock joint profile with realistic unevenness and waviness features NIE...: Rock joint shape characteristics, waviness and unevenness play essential but distinct roles in shear mechanism of rock joints. This study presents a novel method to generate virtual rock joint......
Microstructure characterization of electron beam welded joints of Ti3Al after post-weld heat treatmentHE Jingshan,WU Qingsheng,ZHANG Binggang,LIU Wei,and FENG Jicai State Key Laboratory of Advanced... characterization of electron beam welded(EBW) joints of Ti3Al-Nb was investigated.The results show that the microstructure of the weld is predominantly metastable,the columnar crystal metastructure of B2......
Towards Long-Life Replacement Joint Prostheses - A Surface Engineering Approach Hanshan Dong1 (1.Department of Metallurgy and Materials, The University of Birmingham, Birmingham B15 2TT, UK) 摘要:How to improve the wear resistance of bearing surfaces, hereby achieving long life of orthopaedic joint prostheses has long been a technical challenge with much fundamental interest and social......
FATIGUE STRENGTH DETERMINATION OF BUTT WELDED JOINTS BY FEM J.Brózda1,M.Szubryt1 (1.Instytut Spawalnictwa (Institute of Welding), ul. Bl. Czeslawa 16/18, 44-100 Gliwice, Poland) Abstract... of joints welded by various processes. It has been proven, among others, which by using more advanced welding processes (T.I.M.E) the fatigue strength of welded joints can be increased in comparison......
studied. The results show that, in the joint welded by full and cosmetic penetration, dendrites preserve in the top and bottom of welding center and columnar crystals emerge in the middle. The grain size...Microstructures and high temperature mechanical properties of electron beam welded Inconel 718 superalloy thick plateGAO Peng1, ZHANG Kai-feng1, ZHANG Bing-gang2, JIANG Shao-song1, ZHANG Bao-wei1(1......
strength and Vickers hardness of the welded joint. Key words: 2024-T4 aluminum alloy; friction stir welding; microstructure; tensile properties; Vickers hardness; EBSD; low angle boundary 1... welded joint of aluminum alloys before. FONDA et al [4] have studied the grain structures surrounding FSW tool using electron backscattered diffraction (EBSD) to reveal the development of grain structure......
affected by welding parameters with different microstructure and welding defects.The joint with largest tensile strength was welded at the parameters with tool traverse speed of 200 mm/min...Microstructure and Mechanical Properties of Friction Stir Welded 7050-T7451 Aluminum Alloy Plates朱丹阳School of Materials Science and Engineering,Harbin Institute of Technology摘 要: