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Laser Processing and Material Modification (under planning)

Brief Introduction

Shanghai Key Laboratory of Laser Processing and Material Modification was established on the basis of the original Laboratory of Laser Processing and the Advanced Heat Treatment and Surface Engineering Research Center of the School of Materials Science and Engineering, Shanghai Jiao Tong University. There are 32 members in five research groups working on four research directions. The laboratory is equipped with a 3 kW High Power Nd: YAG Laser, a 15 kW CO2 Laser and a 3.5 kW Diode Laser. Research of laser welding and laser cladding of high strength and new materials, and of surface heat treatment is conducted in the laboratory. Based on large heat-treating furnaces and virtual production platform of materials and surface modification, we are carrying out a long-term research of modification especially property modification of large structure by heat treatment, as well as research of thin film techniques, and have already taken the leadership in the nation's large structure heat treatment field. The laboratory cooperates with institutes of European countries, America and Japan with great initiative.


Members

  • Director
  • Professor Li Jianguo

    Prof. Li Jianguo is an expert in this field with outstanding contributions, winner of National Funds for Distinguished Young Scientists, national candidate for new century talents. He was granted the special allowance by the State Council and has been employed as a professor since 1994. He did co-operative research at the University of California, Los Angeles from 1995 to 1996. He has been the director of state key laboratory of solidification processing of Northwestern Polytechnic University from 1997 to 1999. He is employed as a professor in the School of Materials Science and Engineering of Shanghai Jiao Tong University since 2000. His major researches are about   solidification technology and synthesis of metallic function materials. He has won the second prize of national award for science and technology progress for one time, as well as the first prize of provincial or ministry level award for science and technology progress for 1 time, of 2nd prize for 2 times. More than 300 articles were published in national and international journals.

  • Director of Academic Committee
  • Professor Dr. Shen Weiping

     Born in March, 1946 in Yin County of Zhejiang Province, Prof. Shen studied in the Department of Aircraft and Engine of Beijing Aeronautical Institute (1963-1970) and joined in work in 1970. From 1970 to 1979 he worked in Shanghai Qiu Xin Shipyard and Shanghai Aircraft Factory respectively. In 1982 he got his master degree in the Department of Engineering Mechanics, Shanghai Jiao Tong University and then joined the faculty of Shanghai Jiao Tong University. From 1983 to 1986 he studied for doctor's degree in Stuttgart University (Germany), and received his doctor title with a "distinguished" note. He served as vice dean of the Department of Engineering Mechanics, Shanghai Jiao Tong University in 1990, and became vice president of School of Architecture and Engineering and meanwhile dean of Department of Civil Engineering since 1992. He took the position of vice president of Shanghai Jiao Tong University in 1997. He has been a member of the International Association of Computation (IAC), a committee member of the Chinese Association of Computation Mechanics (CACM), president of Shanghai Strength Society of Mechanics (SSM) and director of Shanghai Society of Aeronautics (SSA). Besides, he was awarded as "Returned Personnel with Outstanding Contributions" by the State Education Commission.

  • Major Team Members
  • (1) Professor Wu Yixiong, Subject Chief Scientist

    (2) Prof. Pan Jiansheng, Academician

    (3) Prof. Cai Xun

    (4) Associate Prof. Huang Jian

    (5) Professor Gu Jianfeng

    (6) Dr. Chen Nailu

    (7) Professor Tang Xinhua

    (8) Prof. Li Zhuguo

    (9) Associate Prof.Hua Xueming

    (10) Prof. Lu Hao


    Research Fields

  • The process and quality of laser manufacturing
  • Research on physical phenomenon in laser fabrication based on digital image processing;
  • Research on characterization of laser manufacturing process with multi-information;
  • Research on stability and reliability of quality of laser fabrication;
  • Research on composite laser manufacturing technology;
  • Research on key integrated technique of laser processing.
  • Intelligent technologies of materials and surface modification
  • Research on computer simulation based intelligent technology of carburizing and nitrating with controllable atmosphere, quenching and vacuum heat treatment
  • Research on process precise control and clean manufacture technology
  • Research on surface modification intelligent technology
  • Research on high density energy intelligent modification technology and surface strengthening technology for light alloy
  • The interface science and materials physics in laser manufacturing
  • Research on physical phenomenon in interface during energy beam-material coupled process;
  • Research on mechanics of welding pool  molten droplet plasma in laser welding;
  • Research on interfacial bond between hard laser clad and substrate;
  • Research on physical and chemical metallurgy of laser manufacturing.
  • Digitalized design for materials manufacture
  • Coupled numerical simulation of multiple fields, including temperature field, microstructure field, stress/strain field, fluid field and concentration field during materials thermal processing of welding and heat treatment.
  • Control technology for intelligentized equipment, including virtual design of new nitrating furnace, automatic control for vacuum carburizing process featured with on-line calculation of diffusion mathematical model, the development of intelligent control system for heat treatment, and etc.

  • Research Achievements

  • Alternately Timed Quenching
  • The problems of poor mechanical properties due to insufficient cooling ability of oil cooling and cracks generated in intensive cooling process of water quenching have not yet been well solved at home and abroad. In our laboratory, with the virtual production method of numerical simulation combining with physical experiments, a new quenching process named Alternately Timed Quenching (ATQ) has been developed. This technology takes water and air as the quenching media, and corresponding quenching equipments with the function of combination of various cooling processes (immersion cooling, spray cooling and air cooling) are designed. Quenching processes determined by virtual production method are carried out under computer control, and the final required microstructure and mechanical properties are obtained. With this technology and equipments, seven patents are authorized and 41 articles are published, seven of which are included by SCI. Certifying committee with the participation of G. E. Totten, the former chairman of International Federation for Heat Treatment and Surface Engineering (IFHTSE), regarded this technology as: There was no precedent in the international for ATQ, and the results were innovative, advanced, practical, reached the advanced world level. IFHTSE introduced this technology especially in its first issue of the official academic journal in 2007. In addition, this technology won Technological Invention 1st Prize of ministry of education.

    Laser Processing and Material Modification

    Digital quenching equipments for Plastic Die Steel based on ATQ

    Laser Processing and Material Modification

    Digital quenching equipments for Marine Crankshaft based on ATQ

  • High power CO2 laser hybrid welding technology
  • Based on the high power CO2 laser welding experiment platform a series of research work concentrated on laser welding of shipbuilding steels, aluminum alloys, titanium alloys and ultra high strength steels has been carried out, which includes analysis of laser induced plasma behavior, investigation of interaction of laser beam and electrical arc, research on laser wire welding and laser-arc hybrid welding of various shipbuilding materials, analysis of joint microstructure and properties, as well as the development of laser welding technology of shipbuilding steel plates. Laser-arc hybrid welding is a preferred method for laser welding of shipbuilding plates (e.g. CCS-B, A36, AH32, 5083A), but its advantages can be brought into play only when a stable, positive coupling between laser and arc is ensured. On the basis of the research work laser wire welding technology and/or laser-arc hybrid welding technology of several shipbuilding steels and aluminum alloys in butt joint form and T-joint form has been successfully developed. Furthermore laser welding of nickel alloys and copper-steel dissimilar joints has also researched. The research result of laser welding Cu-Fe dissimilar joint has attracted the attention from the journal "nature photonics" (IF=24.98) as a research highlight in 2009. According the above mentioned research work more than 30 articles were published, and four patents have been applied. In the following some photos of macro sections of various laser welded joints are showed.

    Laser Processing and Material Modification  Laser Processing and Material Modification  Laser Processing and Material Modification

    8 mm CCS-B, laser wire   8 mm CCS-B, laser hybrid   10 mm A36, laser hybrid

         Laser Processing and Material Modification    Laser Processing and Material Modification    Laser Processing and Material Modification

      10 mm Hastalloy     10 mm 5083A laser hybrid   Cu-Fe dissimilar joint

     


    Cooperation

    Project

    Cooperation units

    Application of laser technology in Chinese shipbuilding (CHINLAS)

    BIAS institute(Germany), Schuler Held Lasertechnik (Germany), Trumpf company (Germany), Germanischer Lloyd (GL)

    Application of high power diode laser in industry (SINODILAS)

    BIAS institute(Germany), Rofin company (Germany), IWS institute (Germany), GL

    Triple-arc high efficient welding process

    Tsuneishi shipbuilding company (Japan)

    Laser Processing and Material Modification

    Common research on high power laser welding in cooperation with Dr. Schilf from BIAS institute in March 2007

    Laser Processing and Material Modification

    Closure of the project CHINLAS on 28th, Nov. 2007, at which the laser processing laboratory as the first institute in worldwide was certificated by GL for the laser welding technology