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2011 Vol. 54, No. 16
Published: 2011-08-15
FEATURE
FIGURE
NEW VIEWPOINT
RESEARCH
COVER STORY
FEATURE
28
Research on Laser Welding and Superplastic Process for Superalloy BTI-62421S
DOI: 10.16080/j.issn1671-833x.2011.16.019
2011 Vol. 54 (16): 28-31 [
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91
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COVER STORY
34
Lean Manufacturing and Aircraft Mobile Assembly Line
DOI: 10.16080/j.issn1671-833x.2011.16.020
2011 Vol. 54 (16): 34-37 [
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132
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40
Research on Flange Instability During Heat Conventional Spinning of Titanium Alloy Thin - Wall Cabin
DOI: 10.16080/j.issn1671-833x.2011.16.021
2011 Vol. 54 (16): 40-42 [
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89
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43
Linear Friction Welding Technology for Titanium Alloy Disc
DOI: 10.16080/j.issn1671-833x.2011.16.001
2011 Vol. 54 (16): 43-47 [
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107
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50
Process Research on SPF/DB for Titanium Alloy Laminated Beam
DOI: 10.16080/j.issn1671-833x.2011.16.022
The laminated structure part has achieved special attitude for its high damage tolerance, and become a type of new application of SPF/DB technology. The laminated “I” beam of titanium alloy can be manufactured by SPF/DB combined technology as the part is fist superplastic formed and then is diffusion bonded to an integrated structure. The size, microstructure and property of the part can conform to design requirements for application. But more research must be carried out to optimize the technical parameters.
2011 Vol. 54 (16): 50-53 [
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93
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54
Superplastic Forming Mold Surface Design of TC4 Titanium Alloy Hemisphere Tank
DOI: 10.16080/j.issn1671-833x.2011.16.023
The machining allowance of the wall thickness of the formed blank hemisphere is decorated reasonably, and the dimensions of the superplastic forming mold surface is calculated. Through the analysis of material deformation mechanism in the process hemisphere superplastic-forming, the reverse direction preforming mold type surface is designed to achieve the purpose of uniform blank wall thickness and to make it satisfy the requirements of subsequent processing size.
2011 Vol. 54 (16): 54-56/59 [
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104
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57
Research on Hot Forming of Abnormity Part of Titanium Alloy TC2
DOI: 10.16080/j.issn1671-833x.2011.16.024
On account of the promble of forming the abnormity part, two forming moulds are designed, one is blank-holder structure along the surface, and the other is central push-out structure, then the problem by hot-forming process on different temperature is solved. Finally the suitable temperature and forming moulds structure of the abnormity part are achieved.
2011 Vol. 54 (16): 57-59 [
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113
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60
Design and Manufacturing of TA15 Titanium Alloy V-Shaped Bellows
DOI: 10.16080/j.issn1671-833x.2011.16.018
TA15 titanium alloy V-shaped bellows is designed by finite element mthod and manufactured by diffusion bonding and stress relaxation technology. The microstructure of diffusion bonding interface, grain size of base metal, material performance loss, intensity and stiffness of high-temperature diffusion bonded V-shaped bellow are analyzed and tested. The results show that the weld joint is good and meets the requirement of intensity, strength, stiffness and fatigue property.
2011 Vol. 54 (16): 60-62/65 [
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93
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63
Material Selection and Fabrication of Metal Flat for Titanium Alloy Hot Forming and Superplastic Forming
DOI: 10.16080/j.issn1671-833x.2011.16.025
Material selection and fabrication of metal fl at for titanium alloy hot forming and superplastic forming are introduced. Compared with heat resistant steels, superalloys are more suitable for fabricating the metal fl at. The producing technology of the metal fl at developed by Central Iron and Steel Research Institute (CISRI) has the advantage over the conventional technology. The homemade metal fl at made of K403 superalloy works stably, which shows that CSRI has capability of producing the metal fl at for titanium alloy hot forming and superplastic forming.
2011 Vol. 54 (16): 63-65 [
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116
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66
Diffusion Bonding of Hydrogenated TC4 Titanium Alloy
DOI: 10.16080/j.issn1671-833x.2011.16.026
The diffusion bonding of hydrogenated TC4 alloy and the mechanic property test are carried out. The diffusion hole close-up ratio and fracture are investigated by means of optical metallographic microscope and scanning electron microscope. The results show that the hydrogen is benefi cial to increasing the holes close-up ratio of TC4 diffusion bonding. With the diffusion bonding parameters increasing the diffusion holes decrease gradually. When bonded at 775℃ for 60min under a pressure of 4MPa, the diffusion holes disappear and the tensile strength of the joint is up to 1017MPa, which reaches 96% that of the base metal, and the fracture face exhibits tearridge and dimple pattern.
2011 Vol. 54 (16): 66-68 [
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69
Research on Application of Shearography in SPF/DB Structure of Titanium Alloy
DOI: 10.16080/j.issn1671-833x.2011.16.002
The defect and reason in superplastic forming and diffusion bonding on titanium alloy are analyed. The basic principle of shearography is introduced. By using the shearography on SPF/DB of titanium alloy, some obvious characteristics of the defect are obtained. Shearography technique is compared with X-ray and ultrasonic on sensitivity, reliability, and so on. Shearography is proved to be an effective technique on SPF/DB of titanium alloy, but the precision and reliability of the technique should be studied deeply in the future.
2011 Vol. 54 (16): 69-71 [
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105
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86
FE Analysis of NC Bending of Thin-Walled CP3 Welded Tubes
DOI: 10.16080/j.issn1671-833x.2011.16.004
According to features of CP3 welded tubes, the tensile tests for parent metal and mixed metal including weld beam and heat-affected zone (HAZ) metal were carried out, and cross-sectional sample of mixed metal are used for measuring microhardness throughout weld zone and HAZ. Then on the basis of the iso-strain assumption and mixture laws, stress-strain relationships of parent metal, weld beam metal and heat-affected zone metal were obtained. Moreover, FE models for NC bending of welded tubes were established. Finally, laws of parameters on the bending of welded tubes were analyzed, and wall thickness distributions of three cross sections of deformed welded and seamless tubes were compared, then effects of weld beam on bending process of welded tubes were obtained.
2011 Vol. 54 (16): 86-89/93 [
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118
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90
Numerical Simulation and Experimental Research on Internal Rolling Connection of Titanium Alloy Tubes
DOI: 10.16080/j.issn1671-833x.2011.16.030
Using the method of numerical simulation,the analysis on the internal rolling connection process is finished.Through the analysises on the spring-back of the tube and sleeve and the law of material flowing the connecting mechanics is mastered.The experimental research points out the effect law of the tube material and the structure of the sleeve to the internal rolling forming. The experiment of compression resistance proofs that the seal performance of the tube union is well.
2011 Vol. 54 (16): 90-93 [
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89
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94
Simulation Analysis on Welding Temperature Fields of TA15 Titanium Alloys
DOI: 10.16080/j.issn1671-833x.2011.16.005
The sheet titanium alloys use widely in welding field. The diathermanous problem in welding process is very complicated, which signifi cantly infl ect the temperature distributing. The temperature cycle curve was gained by means of simulation. By measuring, the test results were in accord with numerical results, thus the results of simulation analysis were correct.
2011 Vol. 54 (16): 94-95 [
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111
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RESEARCH
96
Development and Prospect for Deformation Mechanism Map
DOI: 10.16080/j.issn1671-833x.2011.16.006
Deformation mechanism map, i.e.plastic deformation map, is effective to predict the material deformation during processing, which is very important for basic research on material processing. The constructing method, applying conditions and characteristics for the four deformation mechanism maps are introduced, for example, Ashby, Langdon-Mohamed, Ruano-Wadsworth-Sherby and dislocation R-W-S, respectively. The deformation mechanism map is the basic theory for application on production.
2011 Vol. 54 (16): 96-100/104 [
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101
Analysis on Electron Beam Welding Joint Microstructure of TC11 Titanium Alloy
DOI: 10.16080/j.issn1671-833x.2011.16.007
The 20mm-thick TC11 titanium alloy EBW jiont microstructure is analysised by metallography and microhardness test. Microstructure of welded seam, heating affected zone and transition interface are compared and the generation mechanism of different structuresis elucidated.
2011 Vol. 54 (16): 101-104 [
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102
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105
Research on Morphology and Microstructure of Parallel Welding Seam of TA15 Titanium Alloy EB Welding
DOI: 10.16080/j.issn1671-833x.2011.16.008
Two different parallel welding seam of TA15 Titanium alloy EB welding joints are obtained by using the right parameter under140kV accelerated voltage, 600mm/min velocity, 318mA and 338mA focus current, 43mA and 50mA electron beam current. The result shows that high current results in the coarser grain size, wider heat affected zone and smoother microhardness curve.
2011 Vol. 54 (16): 105-106/110 [
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86
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107
Research on Deformation Mechanism of Ti6Al4V Alloy During Cold Drawing
DOI: 10.16080/j.issn1671-833x.2011.16.009
The microstructure and properties of Ti6Al4V wires after cold drawing are studied. Metalloscope and transmission electron microscopy reveal that the dislocation gliding is the dominant deformation mechanism in the as-drawn wires. During the cold drawing, the microstructure and properties evolution could be separated into three stages. The initial fast strain hardening is mainly caused by deformation of large grain. In this stage entanglement of dislocations begin to form. The second stage is almost a platform. Partial small grains begin to participate in the deformation, which corresponds to the formation of shear bands. As ε>0.60, all grains take part in the deformation and grain refi nement is caused by the changing of low-angle geometrically necessary boundaries (GNBs) into high-angle grain boundaries (HAGBs).
2011 Vol. 54 (16): 107-110 [
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158
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111
Research on EBW Joint Low Cycle Fatigue Property of TC4 - DT Alloy
DOI: 10.16080/j.issn1671-833x.2011.16.010
The EBW joint of TC4 - DT titanium alloy with thickness of 50mm is conducted to invest to the microstructures and fatigue properties in differrent location of joint, and compared with the base metal of TC4 -DT titanium alloy. Based on the observation for microstructure and testing of fatigue property sample, it shows that the 2N f fatigue span of TC4 - DT titanium alloy EBW joint is equal basically to those of base metal when the Δε t/2 expermental strain amplitude is lower than 0.6%. With the increasing of plastic strain amplitude, the difference between the fatigue span of joint in the upper postion and lower position and base metal occurs obvoiusly, in which the 2N f fatigue span of base metal is the highest, and the lowest in the upper postition.
2011 Vol. 54 (16): 111-115/118 [
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116
Research on Laser Cladding Repairing for Defect on Titanium Alloy Surface
DOI: 10.16080/j.issn1671-833x.2011.16.031
Repairing for titanium alloy surface defect with laser cladding method is researched. A number of tests on the coat and the titanium alloy material are carried out. The comparative experiment on the laser cladding method and the argon arc welding is performed. The results prove that the laser cladding method can repair the titanium alloy surface defect well, and the laser cladding coat performances are better than the argon arc welding.
2011 Vol. 54 (16): 116-118 [
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82
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RESEARCH
119
Research on Compound Interface Layer of TA1/Q235 Clad Plate by Cyclic Accumulated Deformation
The intermetallic compound and morphology formed in accumulative roll bonding is analyzed by means of SEM, X ray device. The results show that intermetallic compound formed in the interface between two base materials consists of TiC and Fe2Ti. Removing oxide fi lm and making brittle tectorial membrane are in favor of metallurgical bonding of Ti/carbon steel.
2011 Vol. 54 (16): 119-121/125 [
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75
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122
Infl uence of Fiber C Coating on Interface and Tensile Properties of SiC f /Ti6Al4V
DOI: 10.16080/j.issn1671-833x.2011.16.032
The fracture profi le and interface of SiC fi ber reinforced Ti6Al4V (SiC f /Ti6Al4V) are analyzed, the infl uence of C coating on the inter-diffusion between fiber and matrix, the thickness and composition of reaction layer, tensile fracture profi le is researched. It indicates that SiC f /Ti6Al4V composites made of C coated fi ber has a weaker interface and a thicker reaction layer comparing with uncoated fi ber, the coating can prevent the fi ber mechanical properties from decreasing during the consolidation process, and a high tensile strength is achieved.
2011 Vol. 54 (16): 122-125 [
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86
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126
Research on Microstructure of Ti6Al4V Alloy Sandwich Structure Made by LBW/SPF/DB Process
DOI: 10.16080/j.issn1671-833x.2011.16.033
The Ti6Al4V alloy sandwich structure is made by LBW/SPF/DB process. The evolvement of the microstructure in the LBW area is investigate before and after SPF/DB process. The results indicate that, during the SPF process, the orientation of the β grain changeds gradually towards the tension direction and the fi ne lamellar structure formed which enables the hardness of the welded joint to be reduced but the plasticity increased can bear the combination of the bending and the tension stresses. The crystal grain of the as-received Ti6Al4V alloy remains equiaxed but larger after SPF/DB process and the needle-like α phase is coarser in the central area of the welded joint and the coarse Widmanstaten structure exists in bilateral areas of the welded joint centre and in the heat-affected zone the needle-like α′ phase transforms into short and small α banding.
2011 Vol. 54 (16): 126-129 [
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107
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