• ICALEO 2008 Paper #107 (Mitigation of Porosity in Laser Powder Deposition under Vibratory Condition)

    Mitigation of Porosity in Laser Powder Deposition under Vibratory Condition
    Authors:
    Ehsan Foroozmehr, Center for Laser Aided Manufacturing, Southern Methodist University; Dallas TX USA
    Radovan Kovacevic, Center for Laser Aided Manufacturing, Southern Methodist University; Dallas TX USA
    Syed Hamid, Halliburton Energy Services; Carrollton TX USA
    Presented at ICALEO 2008

    Near-net shape fabrication processes, such as laser powder deposition (LPD) have been used as a unique technique in manufacturing components with complex geometry. Improving the quality of the final buildup is still of great interest. In this paper, the effect of in-process vibration on the porosity perc...

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  • ICALEO 2008 Paper #108 (Application and Evaluation Performance of DMS in the SLS Process)

    Application and Evaluation Performance of DMS in the SLS Process
    Authors:
    Dong Soo Kim, Korea Institute of Machinery & Materials; Daejeon South Korea
    Sung Woo Bae, Korea Institute of Machinery & Materials; Daejeon South Korea
    Kyung Hyun Choi, Cheju National University; Jeju-Si South Korea
    Seong Yeon Yoo, Chungnam National University; Daejeon South Korea
    Presented at ICALEO 2008

    Rapid manufacturing and high accuracy are very important factors in the Selective Laser Sintering (SLS) process, one of Solid Freeform Fabrication (SFF) system due to the life cycle of a product getting shorter. In order to develop more elaborate and speedy system for fabricating o...

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  • ICALEO 2008 Paper #109 (The Use of Holographically Customised Beam Profiles to Control the Overall Physical Cross Section of Direct Metal Depositions)

    The Use of Holographically Customised Beam Profiles to Control the Overall Physical Cross Section of Direct Metal Depositions
    Authors:
    John Tyrer, Loughborough University; Loighborough Great Britain
    Matthew Gibson, Loughborough University; Loughborough Great Britain
    Rebecca Higginson, Loughborough University; Loughborough Great Britain
    Presented at ICALEO 2008

    This work considers the variation in flux density used during deposition and its role in controlling the overall cross sectional profile of the final track. Circular beams of various intensity profiles typically generate little variation in track cross section. When a moving laser beam interacts with a surface th...

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  • ICALEO 2008 Paper #110 (6.5Kw High Power Direct Diode Laser Applications in Heavy Industries)

    6.5Kw High Power Direct Diode Laser Applications in Heavy Industries
    Authors:
    Yoshihisa Maeda, Hitachi Plant Technologies, Ltd.; Tsuchiura, Ibaraki Japan
    Hiromi Kobayashi, Hitachi Plant Technologies, Ltd.; Tsuchiura, Ibaraki Japan
    Tetsuya Kuwano, Hitachi Plant Technologies, Ltd.; Tsuchiura, Ibaraki Japan
    Takeshi Tsukamoto, Materials Research Laboratory; Hitachi, Ibaraki Japan
    Masaaki Iwasas, Mechanical Engineering Research Laboratory; Hitachinaka, Ibaraki Japan
    Presented at ICALEO 2008

    Recently, small spot lasers, e.g., CO2, YAG, disc and fiber lasers, have been applied to material processing in heavy industries. Meanwhile, Direct-Diode-Laser ...

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  • ICALEO 2008 Paper #1101 (Excimer Laser Treatment of Aluminium Alloys and Their Potential Applications)

    Excimer Laser Treatment of Aluminium Alloys and Their Potential Applications
    Authors:
    Z. Liu, The University of Manchester; Manchester Great Britain
    F. Viejo, The University of Manchester; Manchester Great Britain
    Z. Aburas, The University of Manchester; Manchester Great Britain
    Y. Yuan, The University of Manchester; Manchester Great Britain
    A. Gupta, The University of Manchester; Manchester Great Britain
    Presented at ICALEO 2008

    Although laser surface melting (LSM) of aluminium alloys using high power continuous wave (cw) CO2 and Nd:YAG lasers has shown to produce homogenization/refinement of microstructure, the refined second phase particles...

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  • ICALEO 2008 Paper #1102 (Obtaining Thermal Damping Metallic Porous Coating on Ceramics by Means of Supersonic Laser Spray Technique)

    Obtaining Thermal Damping Metallic Porous Coating on Ceramics by Means of Supersonic Laser Spray Technique
    Authors:
    A. Riveiro, University of Vigo; Vigo Spain
    F. Lusquis, University of Vigo; Vigo Spain
    F. Quintero, University of Vigo; Vigo Spain
    R. Comesa�A, University of Vigo; Vigo Spain
    J. Pou, Universidade De Vigo; Vigo Spain
    Presented at ICALEO 2008

    This work presents a novel technique, named supersonic laser spraying, to coat ceramic materials with metals. This technique enables to obtain porous coatings which can act as thermal barriers. In this technique, a laser beam is focused onto the surface of a precursor material in such a wa...

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  • ICALEO 2008 Paper #1104 (Laser Alloying of Al with Ti and Ni Based Powders to Improve Wear Resistance and Hardness)

    Laser Alloying of Al with Ti and Ni Based Powders to Improve Wear Resistance and Hardness
    Authors:
    Lipson Rampedi, CSIR National Laser Centre; Pretoria Southwest Africa
    Luyolo Mabhali, CSIR National Laser Centre; Pretoria Southwest Africa
    Sisa Pityana, CSIR National Laser Centre; Pretoria Southwest Africa
    Presented at ICALEO 2008

    Laser surface alloying of aluminium AA 1200 was performed with a 4.4 kW Rofin Sinar Nd:YAG laser to improve its hardness and wear resistance. Alloying was carried out by depositing Ni and Ti based powders with different weight ratios on the aluminium substrate at different laser scanning speeds. The intermetallics formed were examined using op...

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  • ICALEO 2008 Paper #1105 (Rapid Transformation of Scale on Steel Sheets by Laser Irradiation)

    Rapid Transformation of Scale on Steel Sheets by Laser Irradiation
    Authors:
    Koji Hirano, Nippon Steel Corporation; Futtsu-City Chiba Japan
    Atsushi Sugihashi, Nippon Steel Corporation; Futtsu-City Chiba Japan
    Yasumitsu Kondo, Nippon Steel Corporation; Futtsu-City Chiba Japan
    Hirofumi Imai, Nippon Steel Corporation; Futtsu-City Chiba Japan
    Naoya Hamada, Nippon Steel Corporation; Futtsu-City Chiba Japan
    Presented at ICALEO 2008

    Scale, iron oxide on hot strip steel sheets, consists of several kinds of oxides; hematite (Fe2O3), magnetite (Fe3O4) and wustite (FeO) as well as iron (Fe) itself. In this study, controlling of scale properties is studied...

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  • ICALEO 2008 Paper #1201 (Novel Insights into Porosity Formation Mechanisms in Laser Beam Welding of Aluminium)

    Novel Insights into Porosity Formation Mechanisms in Laser Beam Welding of Aluminium
    Authors:
    Andreas Trautmann, Technical University of Munich; Garching Germany
    Michael F. Zaeh, Technische Universitaet Muenchen; Garching Germany
    Presented at ICALEO 2008

    Porosity formation of laser beam welds in aluminum alloys is problematic for the properties of the welded pieces. For more than a decade extensive research had been concentrated to determine the causes for porosity formation and the design of according welding techniques to suppress their arise. In this paper a novel empirical insight into porosity formation in aluminum alloys is presented. The aluminum alloy considered is EN AW-60...

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  • ICALEO 2008 Paper #1202 (Laser Hybrid Welding of a Lean Duplex Stainless Steel)

    Laser Hybrid Welding of a Lean Duplex Stainless Steel
    Authors:
    Elin Westin, Outokumpu Stainless; Avesta Sweden
    Anna Fellman, Weldcon; Lappeenranta Finland
    Presented at ICALEO 2008

    The use of duplex stainless steel increases steadily worldwide and the fluctuations in nickel price the recent years have contributed to further growth. The lean duplex grade Outokumpu LDX 2101 (EN 1.4162, UNS S32101) has low nickel content and is alloyed with nitrogen and manganese to give a balanced microstructure. It means that good austenite formation is obtained even when laser welding autogenously (without filler). This is in contrast to most other duplex grades, for which laser welding is normally ...

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