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Formability of Ti-1023 Alloys Fabricated by Direct Laser Deposition

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稀有金属材料与工程 2011年第S4期40卷 270-273页

作者： Li Huaixue,Gong Shuili,Fei Qunxing,Yu Chengxue Science and technology on Beam Power Processes Laboratory,avic beijing aeronautical Manufacturing technology research institute,beijing 10024,China avic beijing aeronaut mfg technol res inst Sci & Technol Beam Power Proc Lab Beijing 10024 Peoples R China

Formability of direct laser deposited Ti-1023 alloys was revealed through investigating the pore defects,microstructure and tensile *** results show that gas pores and local non-fusion are two typical defects in the Ti-1023 alloy *** pores are spherical and exist randomly in the deposited ***-fusion defects present irregular and lie in adjacent layer-layer and pass-pass *** layer boundary effects are gradually weakening from the bottom to the top of the single pass *** microstructure of the single pass deposits and multiple pass built block consists of equiaxed ***,the tensile properties of as-deposited Ti-1023 alloys are equal to the as-forged tensile corresponding *** optimizing the laser rapid forming parameters,the non-fusion defects can be eliminated and the dense Ti-1023 parts are obtained.

关键词： Ti-1023 alloys direct laser deposition equiaxed grains epitaxial growth non-fusion

research on Laser Forming technology of TA15 Titanium Alloy Sheet Metal

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稀有金属材料与工程 2011年第S4期40卷 274-277页

作者： Wang Bin,Gong Shuili,Ma Yilun,Zhao Xiaoming,Yao Wei Science and technology on Power Beam Processes Laboratory,avic beijing aeronautical Manufacturing technology research institute,beijing 100024,China avic beijing aeronaut mfg technol res inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

The forming process and influencing factors of laser forming of TA15 titanium alloy sheet metal are *** effects of line energy and area energy on sheet metal bending were *** bending rate did not increase linearly with line energy *** the line energy increased to a certain value,the bending rate decreased gradually for material surface *** influence of sheet thickness on laser forming was also *** with 3mm sheet,1.5mm sheet was bended easily and more sensitive to the *** metallurgical structure showed that the structure of heating area was divided into fusion zone,heat affected zone and intermediate zone.

关键词： laser forming TA15 sheet metal processing parameter

Characteristics of 5A90 Aluminum-lithium Alloy by YAG-MIG Hybrid Welding

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稀有金属材料与工程 2011年第S4期40卷 95-98页

作者： Xu Fei,Gong Shuili,Chen Li,Yang Jing Science and technology on Power Beam Processes Laboratory,avic beijing aeronautical Manufacturing technology research institute,beijing 100024,China avic beijing aeronaut mfg technol res inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

The characteristics of 5A90 Aluminum-Lithium alloy by YAG laser and MIG arc hybrid welding (Hybrid welding) were *** with the laser beam welding (LBW),the hybrid welding could not only improve the weld appearance significantly,but also have better engineering *** obvious microstructure characteristics of joint by the hybrid welding are fine-grained layer near fusion-line and the equiaxed grain in most area of welded *** subgrains of the equiaxed grains,located in the weld center,tend to coarse from bottom to top of weld *** microhardness of welded seam by the hybrid welding (83.57HV0.2) is lower than that by LBW (95.65HV0.2),but the uniformity of the former is better than that of the *** ultimate strength and the elongations after fracture of the joint by the hybrid welding are lower than that by *** tensile fracture always occurs in HAZ or weld centerline,and the fractography presents mixture ***,if the combined mechanical properties of joint by the hybrid welding meet the operation requirements,it should be improved by reasonable artificial aging or heat treatment after welding,and it also should develop a better filler wire matched with the base metal.

关键词： Al-Li alloy hybrid welding LBW microstructure tensile property

Influences of Laser Powers on Microstructure and Properties of the Al-Si/Al+Al_2O_3 Coating on the AZ91D Magnesium Alloy

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稀有金属材料与工程 2011年第S4期40卷 226-230页

作者： Qian Jiangang1,Zhang Jiaxiang1,2,Li Shuqing2,Wang Chun2,Gong Shuili21School of Chemistry and Environment,beijing University of aeronautics and Astronautics,beijing 100191,China2Science and technology on Power Beam Processes Laboratory,avic beijing aeronautical Manufacturing technology research institute,beijing 100024,China beijing Univ aeronaut & Astronaut Sch Chem & Environm Beijing 100191 Peoples R China avic beijing aeronaut mfg technol res inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

An Al-Si/Al+Al2O3 coating was prepared on an AZ91D Mg alloy substrate by laser cladding of the plasma-sprayed coating.X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to identify the phases and to study the morphology,*** adhesion strength and the porosity ratio of the coating were measured by using a tensile testing machine and an optical microscope (OM),*** microhardness was measured using a micro Vickers hardness *** results show that after laser cladding,the adhesion strength of the coating increased from 10.78 to 25.17 *** the laser power was 1400W,the metastable γ-Al2O3 phase in the coating transformed completely into the stable α-Al2O3 *** with the increase of the laser power,the porosity ratio of the coating *** when the laser power was over 1400W,the porosity ratio *** microhardness of the surface was the hardest which was improved from HV0.05125 to *** larger the power of the laser was,the harder the coating *** when the power was 1600W,the microhardness increased slightly,even the microhardness of the internal decreased.

关键词： laser-clad plasma-sprayed magnesium alloy Al-Si/Al+Al2O3 coating

Study on Ultra-sonic Frequency Pulse TIG of Titanium Alloy

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稀有金属材料与工程 2011年第S3期40卷 259-262页

作者： Zhou Shuiliang1, Zhao Haitao1, Qi Bojin 2 1 beijing aeronautical Manufacturing technology research institute, aeronautical Key Laboratory for Aviation Joining technology, beijing 100024, China 2beijing University of aeronautics & Astronautics, beijing 100191, China beijing aeronaut mfg technol res inst Aeronaut Key Lab Aviat Joining Technol Beijing 100024 Peoples R China beijing Univ aeronaut & Astronaut Beijing 100191 Peoples R China

Ti-6Al-4V alloy is used extensively in aerospace and aircraft because of its excellent comprehensive properties and outstanding machinability. Ti-6Al-4V alloy was welded by conventional tungsten iner-gas arc welding (TIG) and ultra-sonic frequency pulse TIG welding (U-TIG) respectively. The welding quality was tested by X-ray, and the mechanical properties of welded joint were tested , the microstructure and the fracture appearance of welded joint were observed by means of optical microscope and SEM .The results show that the joints were welded successfully by U-TIG welding, U-TIG welding could reduced pores defects of welded joint. With the increment of ultra-sonic pulse frequency, the microstructure became more and more fine and was inclined to equiaxed crystal. Moreover, the properties of joint by U-TIG welding were improved compared with that of conventional TIG. Tensile fractures of joints by TIG welding and U-TIG welding all presented character of quasi-cleavage crack, but the cellular dendrite depredation was not observed obviously in U-TIG joint.

关键词： ultra-sonic frequency pulse TIG welding tungsten iner-gas arc welding titanium alloy

Power Beam and Modern Manufacturing

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稀有金属材料与工程 2011年第S4期40卷 14-20页

作者： Gong Shuili Science and technology on Power Beam Processes Laboratory,beijing aeronautical Manufacturing technology research institute (BAMTRI),beijing 100024,China beijing aeronaut mfg technol res inst BAMTRI Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

The power beam processing,including the processing of laser beam,electron beam,ion beam and plasma beam,is one of the advanced modern manufacturing technology,which is extensively used in many fields in the modern *** is playing an important role for modern *** weld technique,surface engineering technique and rapid manufacturing technique processed by power beam at BAMTRI are *** new research progresses are given in this paper.

关键词： power beam weld technique surface engineering technique rapid manufacturing technique

A Review of Ion Beam Assisted Deposition of Thermal Barrier Coatings

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稀有金属材料与工程 2011年第S4期40卷 215-217页

作者： Liu Liang1,2,Gao Wei2,Zhang Huafang2,Lei Xingen2,Cui Xiangzhong2,Zheng Yufeng1 1Centre for Biomedical Materials and Engineering,Harbin Engineering University,Harbin 150001,China2Science and technology on Power Beam Processes Laboratory,avic beijing aeronautical Manufacturing technology research institute,beijing 100024,China Harbin Engn Univ Ctr Biomed Mat & Engn Harbin 150001 Peoples R China avic beijing aeronaut mfg technol res inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

Ion beam assisted deposition (IBAD) technology has been employed more and more in the fabrication of films and/or coatings,especially in the composite *** the present work,after the introduction about IBAD,the latest development of IBAD in thermal barrier coatings (TBCs) is briefly summarized and the future trend is also concluded.

关键词： ion beam assisted deposition ion source thermal barrier coatings thermal conductivity

The Influence of Laser Shock Processing to TC4 Titanium Alloy TIG Welding Bead Microstructure and Properties

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稀有金属材料与工程 2011年第S4期40卷 206-210页

作者： Xu Haiying,Che Zhegang,Zou Shikun,Cao Ziwen Science and technology on Power Beam Processes Laboratory,beijing aeronautical Manufacturing technology research institute,beijing 100024,China beijing aeronaut mfg technol res inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China

TC4 titanium tungsten inert gas arc (TIG) weld beads were treated by laser shock processing (LSP) *** a single and multiple times LSP introduced,surface hardness,tensile mechanical properties and fatigue life of those weld joints were *** results showed that:compared with TC4 titanium alloy TIG joints without LSP treatment,those weld beads surface hardness on weld zone and heat affected zone are nearly *** fatigue life of those TC4 TIG weld joints treated by a single time LSP process is *** the LSP times increased,TC4 titanium alloy weld beads tensile strength and yield strength are not obviously *** special elongation of these welding joints treated by different times LSP treatment will be influenced *** elongation of those joints is decreased with the LSP treatment times increased from one to *** welding joint special elongation was reduced to the least degree since three times LSP treatment had been introduced.

关键词： laser shock processing titanium alloy HV hardness tensile properties fatigue life

Distribution Features of the residual Stress For T-Joints by Laser Welding

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稀有金属材料与工程 2011年第S4期40卷 130-133页

作者： He Enguang1,Gong Shuili1,Wu Bing1,2,Chen Li1 1Science and technology on Power Beam Processes Laboratory,avic beijing aeronautical Manufacturing technology research institute,beijing 100024,China 2 School of Material Science and Engineering,Xi`an Jiaotong University,Xi`an 710049,China avic beijing aeronaut mfg technol res inst Sci & Technol Power Beam Proc Lab Beijing 100024 Peoples R China Xi An Jiao Tong Univ Sch Mat Sci & Engn Xian 710049 Peoples R China

The residual stress of T-joints for SUS304 stainless steel by YAG laser welding was measured by the method of hole-drilling,and the effects of heat treatment and hardness distribution of weld joints on the distribution of residual stress for T-joints were *** results showed that the maximum of longitudinal residual tensile stress for T-joints was about *** maximum of residual stress was not more than 40MPa after heat treatment,the peak of residual stress reduced *** gradient of residual stress distribution was also reduced *** hardening phenomenon occurred for T-joints,and the hardness of weld and heat affected zone was both higher than the hardness of base metal,the peak of hardness occurred in the fusion *** effect of strain hardening phenomenon of weld and heat affected zone on the residual stress distribution of T-joints for SUS304 stainless steel was obvious,which made longitudinal residual tensile stress become higher.

关键词： stainless steel laser welding T-joints heat treatment