ASTM A993-98

Standard Test Method for Dynamic Tear Testing of Cast Irons to Establish Transition Temperature (Withdrawn 2004)

SCOPE
1.1 This test method covers dynamic tear testing and is applicable to graphitic cast irons and establishes the transition temperature from examination of fracture appearance. Details of apparatus, specimens, and procedures are included.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound units given in parentheses are for information only.
1.3 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.
WITHDRAWN RATIONALE
This test method covers dynamic tear testing and is applicable to graphitic cast irons and establishes the transition temperature from examination of fracture appearance. Details of apparatus, specimens, and procedure are included.
Formerly under the jurisdiction of Committee A04 on Iron Castings, this test method was withdrawn in October 2004 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 09-Dec-1998
• Withdrawal Date: 07-Oct-2004
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: A04 - Iron Castings
• Drafting Committee: A04.21 - Testing

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation:A993–98
Standard Test Method for
Dynamic Tear Testing of Cast Irons to Establish Transition
Temperature
This standard is issued under the fixed designation A 993; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope temperature, the specimens are tested at the specified tempera-
ture. Using the ratio of ductile to brittle fracture, the area is
1.1 This test method covers dynamic tear testing and is
measured for each sample and the results of all samples tested
applicable to graphitic cast irons and establishes the transition
at each temperature are averaged.The area of brittle (cleavage)
temperature from examination of fracture appearance. Details
fracture must be no more than 50 % of the fracture surface.
of apparatus, specimens, and procedures are included.
1.2 The values stated in SI units are to be regarded as the
4. Test Specimen
standard. The inch-pound units given in parentheses are for
4.1 Dynamic Tear (DT) specimens, with dimensions as
information only.
specified in Fig. 1, are to be cast in green sand or dried, baked,
1.3 This standard does not purport to address all of the
or chemically bonded molds made with siliceous sand and
safety concerns, if any, associated with its use. It is the
appropriate binders. When placing more than one sample in a
responsibility of the user of this standard to establish appro-
given mold, each sample shall be separated sufficiently to
priate safety and health practices and determine the applica-
assure a cooling rate essentially independent of the adjacent
bility of regulatory limitations prior to use.
samples. Each DT sample shall be cooled until totally black
2. Referenced Documents prior to shakeout.
4.2 Machining will be required on at least two faces of the
2.1 ASTM Standards:
test piece. One side is to be notched and the other impacted.A
A 644 Terminology Related to Iron Castings
notch is milled or sawn into each specimen as shown in Fig. 1.
E 208 Test Method for Conducting Drop-Weight Test to
Determine Nil-Ductility Transition Temperature of Ferritic
5. Apparatus
Steels
5.1 A typical fracture test drop tower is shown in Fig. 2.
E 604 Test Method for Dynamic Tear Testing of Metallic
3 5.2 Adrop weight with a non-instrumented tup is used. The
Materials
standard combined weight for these two items is 22.7 kg (50
3. Summary of Test Method lb). Tup design is to be as defined in Test Method E 604E 604.
5.3 The weight is allowed to fall via guide rails to cause DT
3.1 The Dynamic Tear (DT) test involves a single-edge
specimen fracture. Frictional effects that slow the velocity of
notched beam that is impact loaded in three-point bending.
the falling weight, prior to specimen fracture, are to be kept to
3.2 The DT specimens are fractured with a drop-weight
a minimum.
machine at a variety of temperatures.
5.4 At the time of weight release, the standard distance
3.3 The fracture surface of each specimen is examined to
between the bottom of the tup and the top (impact) surface of
determinetheratioofductiletobrittlefractureandthesevalues
the specimen is 760, 6 7.6 mm (30 6 0.30 in.), as illustrated
are then plotted against temperature to determine the transition
in Fig. 2.
temperature; the temperature at which the fracture surface
5.5 The fixture on which the specimen rests at the time of
shows 50 % ductile and 50 % brittle fracture, is the transition
impact is shown in Fig. 1. Each anvil is to have a radius of 12.7
temperature.
6 0.25 6 mm (0.500 6 0.01 in.). The distance between anvil
3.4 If this test method is to be used solely to establish that
centers is to be 165.0 6 1.65 mm (6.500 6 0.403 in.).
the transition temperature is at or below a customer specified
5.6 The force used must be sufficient to break the specimen
in a single blow. If use of the standard height and weight do not
This test method is under the jurisdiction of ASTM Committee A-4 on Iron
produce this result for the iron being evaluated, the weight or
Castings and is the direct responsibility of Subcommittee A04.21 on Testing.
drop distance must be increased. The weight and drop distance
Current edition approved December 10, 1998. Published March 1999.
used must be reported. A weight increase is preferable.
Annual Book of ASTM Standards, Vol 01.02.
Annual Book of ASTM Standards, Vol 03.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: T
...