Super 304 steel aging rating method based on precipitated phase area fraction of scanning electron microscope

Super 304 steel aging rating method based on precipitated phase area fraction of scanning electron microscope

  • CN 103,630,566 A
  • Filed: 11/07/2013
  • Published: 03/12/2014
  • Est. Priority Date: 11/07/2013
  • Status: Active Application
First Claim
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1. the aging ranking method of super304 steel based on scanning electron microscope precipitated phase area fraction, is characterized in that comprising the following steps:

  • (1) prepare the metallographic specimen of 10mm * 10mm size;

    (2) under scanning electron microscope, observe the precipitated phase pattern picture of super304 steel sample, 1~

    3 scanning electron microscope pattern picture of random shooting multiple≤

    2000 times;

    (3) utilize precipitated phase area fraction S in each picture of image analysis software statistical study, precipitated phase area accounts for the number percent of picture area, then calculates the mean value of each picture precipitated phase area fraction S;

    (4) according to the mean value of precipitated phase area fraction S, carry out aging grading, its grading standard is;

    When S≤

    2.0, for one-level aging;

    When 2.0 <

    S≤

    2.8, for secondary aging;

    When 2.8 <

    S≤

    3.8, be three grades aging;

    When 3.8 <

    S≤

    4.3, for level Four aging;

    When S >

    4.3, for Pyatyi aging.

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