ASTM WK69371

    New Practice for Standard practice for generating mechanical performance debits

    (What is a Work Item?)

    Developed by Subcommittee: F42.01 | Committee F42 | Contact Staff Manager



    WK69371

    1. Scope

    The ASTM AM Center of Excellence including Auburn University (AU), EWI, ASTM International, and NIAR along with its industrial partners are determining the mechanical performance debit of using as-built additively manufactured (AM) components, understanding how this changes with application of hot isostatic pressing (HIP), and testing the values by burst testing thin wall components with narrow flow channels. This 2nd part of the work is being complemented by a group led by Arizona State University with their industry partners. The goal is to publish a standard regarding the mechanical performance debit value of as-built, HIPed, and machined AM L-PBF components. Both thin wall features and narrow flow channels are included in this project. These results should enable the use of high temperature alloys for intermediate temperature aeroengine applications by applying AM for situations with tight configuration tolerances and further extending the temperature range by introducing narrow flow path cooling channels. This program will determine the best practices for generating mechanical performance debit of using as-built surfaces relative to wrought surfaces for thin wall components and determine debits for designs with internal channels. Tensile properties at both room temperature and normal service temperature will be used for comparison in addition to the results of fatigue tests.


    Keywords

    Mechanical debit, high temperature alloys, as-built, HIP

    Rationale

    There is a lack of best practices for post-processing of AM components. This is a key missing link in the process-structure-property-performance relationships. There has been much investment in understanding the AM process within the box of an AM system, but the outside the box parameters must also be understood to allow a holistic design-to-fly understanding of AM. A quantitative understanding of these processes will enable a cost benefit based design and manufacturing decisions. This will reduce the cost of product development and simplify qualification. The correlations between fatigue life and roughness metrics will be determined to enable quality assurance programs. Industrial relevance will be ensured by following an empirical plan-do-check methodology with industrial partners contributing in the plan and react phases.

    The title and scope are in draft form and are under development within this ASTM Committee.

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    Work Item Status

    Date Initiated:
    07-31-2019

    Technical Contact:
    Adam Brooks

    Status:
    Draft Under Development