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Bending behaviors of large diameter thin-walled cp-ti tube in rotary draw bending

Progress in Natural Science:Materials International 2011年第5期21卷 401-412页

作者： Zhi-yong ZHANG,He YANG,Heng LI,Ning REN,Yu-li tiAN State Key Laboratory of Solidification Processing,School of Materials Science and Engineering, Northwestern Polytechnical University,Xi’an 710072,China State Key Laboratory of Solidification Processing School of Materials Science and Engineering Northwestern Polytechnical University

The rotary draw bending(RDB) of large diameter thin-walled(LDTW) tube needs the strict cooperation of multiple processing parameters to avoid possible multiple *** to the specific properties,the bending behaviors of LDTW commercial pure titanium(cp-ti) tube are much more complex to achieve precise *** the cp-ti tube of 50.8 mm(out diameter, D)×0.508 mm(wall thickness,t)×101.6 mm(bending radius,R) as a representative component,the bending behaviors of LDTW cp-ti tube under different processing conditions were *** experiments and analytical analysis,the bending characteristics of the cp-ti tube were ***,based on the orthogonal experimental design,a series of three-dimensional FE models of RDB for LDTW cp-ti tube were established,and the effects of processing parameters on the bending behaviors were numerically *** results show that:1) Wrinkling is the primary behavior for the LDTW cp-ti tube in RDB,and the larger the difference between the maximum wall thickening and the maximum wall thinning degrees of the bent tube,the larger the wrinkling tendency;2) The bending behaviors of the LDTW cp-ti tube are very sensitive to the some processing parameters,and the wrinkling is significantly affected by the mandrel shank diameter,while the wall thinning is remarkably affected by the clearance between wiper die and tube,mandrel shank *** qualified bent tube with the wall thinning of 11.43%,the cross-section distortion of 2.69%and the wrinkling height less than 2%is then obtained.

关键词： cp-ti tube large diameter rotary draw bending bending behaviors processing parameters

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Influence of flash trap profiles on joint properties of friction welded cp-ti tube to 304L stainless steel tube plate using external tool

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2067-2078页

作者： C.MAXWELL REJIL C.SHARAN S.MUTHUKUMARAN M.VASUDEVAN Department of Mechanical Engineering CMR Institute of Technology Department of Metallurgical and Materials Engineering National Institute of Technology Advanced Welding Processes and Modeling Section Materials Technology DivisionIndira Gandhi Centre for Atomic Research

titanium tube and stainless steel tube plate were welded by an innovative friction welding of tube to tube plate using an external tool (FWTPET). Copper was used as an interlayer for joining the dissimilar materials and also to minimize the effect of intermetallics formed at the joint interface. The process parameters that govern FWTPET process are plunge rate, rotational speed, plunge depth, axial load and flash trap profile. Among them, the flash trap profile of the tube has a significant influence on the joint integrity. Various flash trap profiles like vertical slots, holes, zig-zag holes, and petals were made on the titanium tube welded to the stainless steel tube plate. Macroscopic and microscopic studies reveal defect-free joints. The presence of copper interlayer and intermetallics was evident from X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) studies. The microhardness survey was presented across and along the interface. A novel test procedure called “plunge shear test” was developed to evaluate the joint properties of the welded joints. The highest shear fracture load of 31.58 kN was observed on the sample having petals as flash trap profile. The sheared surfaces were further characterized using SEM for fractography.

关键词： 304L stainless steel tube plate cp-ti tube friction welding joint properties flash trap external tool

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