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类型NF-A05-152-84.pdf

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    关 键  词:
    NF A05 152 84
    资源描述:
    1
    I REGISTERED
    IRON AND STEEL PRODUCTS
    NF
    FRENCH
    MACROSCOPIC EXAMINATION BY STRONG
    A05-152
    I STANDARD I
    MINERAL ACID ATTACK
    」 September1984
    TABLE OF CONTENTS
    ctl
    le
    PA
    GENERAL
    SCOPE
    2
    FTELD OF APPLICATION
    PRINCIPLE AND PURPOSE0 F TEE TEST????。。。
    ETCHANTS
    TEST PIECE。。。。。。。。,??。。,,。4
    6
    MACHINING
    7
    EST PROCEDURE。。。。。。。
    REMARKS
    TEST REPORT??。?。。。。。。。?。。?。?
    REGISTERED BY
    This Standard replaces
    DECISION OF
    standard A 05, 152 of 1969.11
    19840805
    PRODUITS SIDERURGIQUES
    EXAMEN MACROSCOPIQUE PAR ATTAQUE
    AUX ACIDES MINERAUX FORTS
    2
    GENERAL
    The circumstances in which the test can be applied and the manner in
    which the observed results are to be interpreted depends on the
    particular case they are laid down in the Bpec1f1catlon or are
    determined by special agreement
    0、2
    The surface attacked 18 observed with the naked eye with the held of
    a magnifying giass (magnification less than 10)
    SCOPE
    he essential purpose of this standard is to describe the test
    procedure and to define the main purposes for which It can be used
    IELD OF APPLICATION
    The uses of macroscopic examination by strong mineral acid attack are
    unlimited. The desired objective is achieved by the approprlate
    choice of the nature and concentration of the etchant, of the
    temperature of attack and of the way in which the test piece 18
    prepared
    PRINCIPLE AND PURPOSE OF THE TEST
    Macrogcoplc examination using attack with strong mineral acids is
    Intended to reveal the structure of a metal testpiece and also any
    hyB_ cal or chemical anoma1⊥ea1fab1 e to affectュ ts homogeneity。
    The atchant acts by dissolving the Surface of the metal at varying
    speed, thus creating differences of level which can be observed
    Macroscopic examinatlon by mineral acid attack reveals chemical
    heterogeneities (segregations), physical heterogeneities (cracks
    poros1t1e8) and, where applicable, certain ntentional or accidental
    heterogeneities such as treatment by quenching, decarburisation
    cementation, etc
    3.4. In addition, very high Ben81tivity to attack can be obtained by
    varying the conditions of preparation and attack. It d8 possible, for
    example, to reveal the dendritic structure of a metal or the presence
    of inclusions or very small defecte
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