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Full Description

Significance and Use

Ductile vs. Brittle Behavior-Body-centered-cubic or ferritic alloys exhibit a significant transition in behavior when impact tested over a range of temperatures. At temperatures above transition, impact specimens fracture by a ductile (usually microvoid coalescence) mechanism, absorbing relatively large amounts of energy. At lower temperatures, they fracture in a brittle (usually cleavage) manner absorbing less energy. Within the transition range, the fracture will generally be a mixture of areas of ductile fracture and brittle fracture.

The temperature range of the transition from one type of behavior to the other varies according to the material being tested. This transition behavior may be defined in various ways for specification purposes.

The specification may require a minimum test result for absorbed energy, fracture appearance, lateral expansion, or a combination thereof, at a specified test temperature.

The specification may require the determination of the transition temperature at which either the absorbed energy or fracture appearance attains a specified level when testing is performed over a range of temperatures.

Further information on the significance of impact testing appears in Annex A5.
 

Document History

  1. ASTM A370-20


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Most Recent
  2. ASTM A370-19e1


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  3. ASTM A370-19


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  4. ASTM A370-18


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  5. ASTM A370-17a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  6. ASTM A370-17


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  7. ASTM A370-16


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  8. ASTM A370-15


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  9. ASTM A370-14


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  10. ASTM A370-13


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  11. ASTM A370-12a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  12. ASTM A370-12


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  13. ASTM A370-11a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  14. ASTM A370-11


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  15. ASTM A370-10


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  16. ASTM A370-09a

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    viewing


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  17. ASTM A370-09ae1


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  18. ASTM A370-09


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  19. ASTM A370-08b


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  20. ASTM A370-08a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  21. ASTM A370-08


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  22. ASTM A370-07b


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  23. ASTM A370-07a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  24. ASTM A370-07


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  25. ASTM A370-06


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  26. ASTM A370-05


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  27. ASTM A370-03a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  28. ASTM A370-03


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  29. ASTM A370-02e1


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  30. ASTM A370-02


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  31. ASTM A370-01


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  32. ASTM A370-97a


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  33. ASTM A370-94


    Standard Test Methods and Definitions for Mechanical Testing of Steel Products

    • Historical Version
  34. ASTM A370-68


    Standard Methods And Definitions For Mechanical Testing Of Steel Products

    • Historical Version