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Effect of cold-working on corrosion induced damage in lug joints
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作者 Ramanath M.N Chikmath L. Murthy H. 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2024年第6期175-182,共8页
Lug joints are preferred joineries for transferring heavy loads to parent components in aerospace vehicles.They experience corrosion due to environmental conditions,improper surface finishes and rubbing displacement b... Lug joints are preferred joineries for transferring heavy loads to parent components in aerospace vehicles.They experience corrosion due to environmental conditions,improper surface finishes and rubbing displacement between the pin and lug-hole.This causes damage of different sizes and shapes near the lug-hole.Stiffness degradation due to corrosion-induced damage is modelled as a through-pit at one of the identified critical locations through stress analysis.The effect of this pit on fatigue crack initiation life is estimated.Lug-hole is pre-stressed by cold-working and the benefits of inducing plastic wake on the intended performance of the lug joint during the damages due to corrosion are brought out and compared with non-cold-worked lug-hole.Numerical analysis is performed on this lug joint with pressfit.The results obtained highlight the benefits of cold-working and the methodology can be extended to damage growth and analyse the effect of surface treatments for better structural integrity of components of aerospace vehicles. 展开更多
关键词 Lug joint CORROSION Crack initiation cold-workING Structural integrity
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INFLUENCE OF COLD-WORKING AND HEAT TREATING ON ELASTIC PROPERTIES OF Nb AND Nb-BASE ALLOYS
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作者 HUANG Tewei Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,Beijing,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1992年第4期236-239,共4页
The elastic limit of single-phase alloy Nb-2Mo-2Zr-1Ti is higher as recovered state in comparison with as cold-rolled or recrystallized one.For Nb-40Ti-5.5AI alloy of age-hardening type,the elastic limit is lower as c... The elastic limit of single-phase alloy Nb-2Mo-2Zr-1Ti is higher as recovered state in comparison with as cold-rolled or recrystallized one.For Nb-40Ti-5.5AI alloy of age-hardening type,the elastic limit is lower as cold-rolled state,but increases considerably after proper aging.However,its elastic modulus changes no more,so the stored-energy (σ_e^2/E)may raise significantly.The temperature dependence on elastic modulus for pure Nb as intensely cold-worked or recrystallized state is anomalous.This anomaly may disap- pear after recovered treatment of intensely cold-worked state at 600℃ for 4 h.and may change no more after that of recrystallized state.The anomalous behaviour of elasticity was also discussed on the non-magnetic Nb. 展开更多
关键词 Nb-base alloy elastic property cold-workING heat treatment
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THE EFFECT OF COLD DEFORMATION ON THE KINETICS OF THE SPINODAL DECOMPOSITION OF Cu-9Ni-6Sn-0.3Ce ALLOY 被引量:1
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作者 Deng Zhongmin 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 1992年第1期93-97,共5页
By means of the measurement of mechnical properties and resistivity and X-ray diffraction and transmission microscopy,the effect of cold deformation on the kinetics of spinodal decomposition of Cu-9Ni-6Sn-0.3Ce alloy ... By means of the measurement of mechnical properties and resistivity and X-ray diffraction and transmission microscopy,the effect of cold deformation on the kinetics of spinodal decomposition of Cu-9Ni-6Sn-0.3Ce alloy was studied.The strengthening process of the cold-worked and aged alloy was found to be accelerated.Using the theory of dislocation,the strengthening in cold-worked alloy can be attributed to the acceleration of spinodal process. 展开更多
关键词 Cu-9Ni-6Sn-0.3Ce Spinodal decomposition cold-worked alloy
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Characterization of Different Surface States and Its Effects on the Oxidation Behaviours of Alloy 690TT 被引量:9
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作者 Zhiming Zhang Jianqiu Wang +1 位作者 En-Hou Han Wei Ke 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2012年第4期353-361,共9页
Alloy 690TT samples with four kinds of surface states were prepared: 1) ground to 400 grit; 2) ground to 1500 grit; 3) mechanically polished (MP) and 4) electro-polished (EP). The surface morphologies and the... Alloy 690TT samples with four kinds of surface states were prepared: 1) ground to 400 grit; 2) ground to 1500 grit; 3) mechanically polished (MP) and 4) electro-polished (EP). The surface morphologies and the surface skin layers' microstructures of these samples were characterized systematically using various methods and the effects of surface states on the oxidation behaviours of Alloy 690TT were also discussed. The results showed that surface roughness and micro-hardness decreased gradually from the ground to EP surfaces. The grains in the near-surface layers of the ground and MP surfaces had been refined and the residual strains were also very high. The dislocations on the ground surfaces were mainly parallel dislocation lines. The thickness of the superficial cold-worked layers decreased gradually from the ground surfaces to polished surfaces. The oxide morphologies and oxidation rate depended greatly on the surface states of samples. Cold-working by grinding treatments could benefit the outward diffusion of metallic atoms and the nucleation of surface oxides and then accelerate the growth of surface oxide films. 展开更多
关键词 Alloy 690TT Surface states cold-worked layer MICROSTRAIN Grain refinement
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