ASTM E1921-15ae1
- standard by ASTM International, 10/01/2015
- Standard Test Method for Determination of Reference Temperature, To, for Ferritic Steels in the Transition Range
- Category: ASTM
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Full Description
1.1 This test method covers the determination of a reference temperature, To, which characterizes the fracture toughness of ferritic steels that experience onset of cleavage cracking at elastic, or elastic-plastic KJc instabilities, or both. The specific types of ferritic steels (3.2.1) covered are those with yield strengths ranging from 275 to 825 MPa (40 to 120 ksi) and weld metals, after stress-relief annealing, that have 10 % or less strength mismatch relative to that of the base metal.
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 KJc values tend to vary with the specimen type at a given test temperature, presumably due to constraint differences among the allowable test specimens in 1.2. The degree of KJc variability among specimen types is analytically predicted to be a function of the material flow properties (1)2 and decreases with increasing strain hardening capacity for a given yield strength material. This KJc dependency ultimately leads to discrepancies in calculated To values as a function of specimen type for the same material. To values obtained from C(T) specimens are expected to be higher than To values obtained from SE(B) specimens. Best estimate comparisons of several materials indicate that the average difference between C(T) and SE(B)-derived To values is approximately 10°C (2). C(T) and SE(B) To differences up to 15°C have also been recorded (3). However, comparisons of individual, small datasets may not necessarily reveal this average trend. Datasets which contain both C(T) and SE(B) specimens may generate To results which fall between the To values calculated using solely C(T) or SE(B) specimens. It is therefore strongly recommended that the specimen type be reported along with the derived To value in all reporting, analysis, and discussion of results. This recommended reporting is in addition to the requirements in 11.1.1.
1.4 Requirements are set on specimen size and the number of replicate tests that are needed to establish acceptable characterization of KJc data populations.
1.5 To is dependent on loading rate. To is evaluated for a quasi-static loading rate range with 0.1< dK/dt < 2 MPa√m/s. Slowly loaded specimens (dK/dt < 0.1 MPa√m) can be analyzed if environmental effects are known to b
Product Details
- Published:
- 10/01/2015
- Number of Pages:
- 27
- File Size:
- 1 file , 610 KB
- Note:
- This product is unavailable in Russia, Ukraine, Belarus
Document History
ASTM E1921-22a
ASTM E1921-22
ASTM E1921-21
ASTM E1921-20
ASTM E1921-19be1
ASTM E1921-19b
ASTM E1921-18a
ASTM E1921-18
ASTM E1921-17a
ASTM E1921-17
ASTM E1921-16
ASTM E1921-15ae1
ASTM E1921-15a
ASTM E1921-15
ASTM E1921-14a
ASTM E1921-13a
ASTM E1921-13
ASTM E1921-12a
ASTM E1921-11a
ASTM E1921-11
ASTM E1921-10e1
ASTM E1921-10
ASTM E1921-09ce2
ASTM E1921-09ce1
ASTM E1921-09c
ASTM E1921-09a
ASTM E1921-09
ASTM E1921-08ae1
ASTM E1921-08a
ASTM E1921-08
ASTM E1921-07
ASTM E1921-05
ASTM E1921-03
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