ASTM-E1921 › Historical Revision Information
Standard Test Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range
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Scope
1.1 This test method covers the determination of a reference temperature, T
1.2 The specimens covered are fatigue precracked single-edge notched bend bars, SE(B), and standard or disk-shaped compact tension specimens, C(T) or DC(T). A range of specimen sizes with proportional dimensions is recommended. The dimension on which the proportionality is based is specimen thickness.
1.3 Median K
1.4 Requirements are set on specimen size and the number of replicate tests that are needed to establish acceptable characterization of K
1.5 The statistical effects of specimen size on K
1.6 Statistical methods are employed to predict the transition toughness curve and specified tolerance bounds for 1T specimens of the material tested. The standard deviation of the data distribution is a function of Weibull slope and median K
1.7 The fracture toughness evaluation of nonuniform material is not amenable to the statistical analysis methods employed in this standard. Materials must have macroscopically uniform tensile and toughness properties. For example, multipass weldments can create heat-affected and brittle zones with localized properties that are quite different from either the bulk material or weld. Thick section steel also often exhibits some variation in properties near the surfaces. Metallography and initial screening may be necessary to verify the applicability of these and similarly graded materials. Paticular notice should be given to the 2% and 98% tolerance bounds on K
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywords
reference temperature; ferritic steels; transition range; ICS Number Code 77.040.10 (Mechanical testing of metals)
To find similar documents by ASTM Volume:
03.01 (Metals -- Mechanical Testing; Elevated and Low-Temperature Tests; Metallography)
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Document Number
ASTM-E1921-05
Revision Level
2005 EDITION
Status
Superseded
Modification Type
Revision
Publication Date
Jan. 1, 2005
Document Type
Test Method
Page Count
20 pages
Committee Number
E08.07