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Novel Reduced-friction Materials by Laser Cladding of Copper Alloy on Cast Iron

Xichen YANG Milin ZHONG Tianxi ZHENG Naikun ZHANG Laser Processing Lab. , Tianjin Institute of Textile Science and Technology , Tianjin , 300160 , China

材料科学技术（英文）

Copper alloys suitable for laser cladding on cast iron are selected trom rune types of conventional powders. There are a poor spreading ability and porosity of copper alloy over the surface of castiron. Copper alloy surface is easily oxidized in atmosphere. These shortages have been overcome by ad- ding deoxidizers of Si and H_3BO_3. Laser parameters, stress and coefficient of friction have been ex- amined, and the larger smooth surface of Cu/cast iron for friction by laser cladding has been made for the application of the guide shoes of machine.

关键词: laser cladding , null , null

FEM Simulation for Laser Forming Processing

L.Q. Li , Y.B. Chen , X.Y. Wang , S.Y. Lin

金属学报(英文版)

Laser forming involves heating sheet metal workpiece along a certain path with a defocused laser beam directed irradiate to the surface. During laser forming, a transient temperature fields is caused by the irradiation and travelling of a laser beam. Consequently, thermal expansion and contraction take place, and allows the thermal- mechanical forming of complex shapes. This is a new manufacturing technique that forming metal sheet only by thermal stress. Therefore, the analysis of temperature fields and stress fields are very useful for studying the forming mechanism and controlling the accuracy of laser forming. The non-liner finite element solver, MARC, is employed to solve the thermal-mechanical analysis. Using this model, the stress and strain distribution of pure aluminum plate with di®erent thickness are analyzed. The influence of scanning speed on temperature fields and plastic strain of metal sheet under the condition of constant line energy are also presented. Numerical results agree well with the experimental results.

关键词: laser forming , null , null

EFFECT OF LASER MELTING PROCESSING ON MICROSTRUCTURE OF GRAY CAST IRON

SHEN Lian LI Chenglao WANG Xiuling MA Lihua ZHU Daozhen Xi'an Jiaotong University , Xi'an , China Associate Professor , Dept.of Materials Science and Engineering , Xi'an Jiaotong University , Xi'an , China

金属学报(英文版)

The microstructure of the laser hardened layer on the HT20-40 gray cast iron after laser melting processing'was examined by optical microscopy,transmission electron microscopy (TEM)and scanning electron microscopy(SEM).Experimental results showed that a struc- ture with dendritic(M+A')and interdendriticly laminal transformed ledeburite (M+A'+Fe_3C)was produced after laser melting processing.The martensite is a mixture of dis- location martensite and twin martensite.Dislocation pile-ups and twins were found in the residual austenite.Microsegregation of composition and heterogeneity of microstructure were also apparent after laser melting processing.

关键词: laser processing , null , null

Laser Shock Processing of an Austenitic Stainless Steel and a Nickel-base Superalloy

Huaming WANG , Xijun SUN , Xiaoxuan LI

材料科学技术（英文）

An austenitic stainless steel 1Cr18Ni9Ti and a solid solution-strengthened Ni-base superalloy GH30 were shock processed using a Q-switched pulsed Nd-glass laser. Microstructure, hardness and residual stress of the laser shock processed surface were investigated as functions of laser processing parameters. Results show that high density of dislocations and fine deformation twins are produced in the laser shock processed surface layers in both the austenitic stainless steel and the nickel-base superalloy. Extensive strain-induced martensite was also observed in the laser shock processed zone of the austenitic steel. The hardness of the laser shock processed surface was significantly enhanced and compressive stress as high as 400 MPa was produced in the laser shock processed surface.

关键词: Laser shock processing , null , null , null

CLAS+FROST: new generation of photoproduction experiments at Jefferson Lab.

中国物理C

关键词:

SIMULATION OF TEMPERATURE AND THERMAL STRESS FIELD IN LASER MILLING PROCESSING

G.F. Yuan , C.S. Ge , X.Y. Zeng

金属学报(英文版)

The physical model of temperature field and thermal stress field are established in this paper, on which the numerical simulation with the assuming physical and laser milling parameters have been finished. The laser milling process can be explained.

关键词: laser milling , null , null

STUDY ON STRENGTHENING AVIATION ALUMINIUM ALLOY BY LASER SHOCK PROCESSING

Q.L.Deng1) , W.D.Huang1) , Y.H.Zhou1) , C.Y.Yu2) , Y.K.Zhang2) , Y.X.Tang2) and H.Zhang2) 1) State Key Lab .of Solidification Processing , Northwestern Polytechnical University , Xi’an 710072 , China 2) Mechanical Department , Nanjing University of Aeronautics & Astronautics , Nanjing 210016 , China

金属学报(英文版)

The mechanism oflasershock processing wasanalyzedinthispaper. Westudyexperimentallythelasershock processingon 2024 T62 aviation aluminium alloys. Theexperimental results show thefatiguelife of 2024 T62 aviation aluminium alloysshocked by a laserisimprovedgreatly.

关键词: lasershock processing , null , null

Metal/ceramic interface in an in situ synthesized Ti/TiCP composite coating by laser processing

Journal of Materials Research

The metal/ceramic interface in an in situ synthesized Ti/TiCP composite coating by laser processing was analyzed using high-resolution transmission electron microscopy. The TiC particles were distributed uniformly in the matrix and were highly faceted. The interfaces between the TiC particles and the beta matrix were abrupt and free of any other reaction phases. It was the Ti-terminated TiC surface that bonded to the beta matrix, resulting in the metallic bonding between the TiC particles and the matrix.

关键词: resolution electron-microscopy;ti-6al-4v;tic(100);tic(111)