Tensile strengths for laser-fabricated parts and similarity parameters for rapid manufacturing

    Authors

    F. J. Kahlen;A. Kar

    Comments

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    Abbreviated Journal Title

    J. Manuf. Sci. Eng.-Trans. ASME

    Keywords

    Engineering, Manufacturing; Engineering, Mechanical

    Abstract

    This paper presents a set of process parameter selection rules to deposit a good metal purr. A CO2 laser is used to melt metal port der to achieve layer by layer deposition for fabricating three-dimensional parts. Dimensionless numbers characterizing this powder deposition process are identified using Buckingham's Pi -Theorem, These dimensionless numbers are used to identify a range of values for the process parameters, such as the laser power, spot diameter, speed of the xyz stage and powder flow rate, to achieve good quality layers for different materials. The yield and ultimate strengths are examined for parts fabricated with stainless steel 304 (SS 304) powder under three different processing conditions, These stresses are correlated to the operating conditions and physical dimensions of the deposit through the dimensionless similarity parameters. Experimental data indicate that the yield strength of the part is close to the value of standard sample (250 MPa, same as wrought stainless steel SS304). It is also observed that the direction of maximum yield strength is oriented very close to the dominant direction of material solidification. The ultimate strength is found to be considerably less than the ultimate strength of wrought SS 304 (540 MPa) which may be due to the residual stresses generated in the part.

    Journal Title

    Journal of Manufacturing Science and Engineering-Transactions of the Asme

    Volume

    123

    Issue/Number

    1

    Publication Date

    1-1-2001

    Document Type

    Article

    Language

    English

    First Page

    38

    Last Page

    44

    WOS Identifier

    WOS:000168002900006

    ISSN

    1087-1357

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