ASTM A644-05

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Designation:A644–05
Standard Terminology Relating to
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Iron Castings
This standard is issued under the fixed designation A644; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
ausferrite, n—a cast iron matrix microstructure, produced by the amount which can be retained in solid solution in
a controlled thermal process, which consists of predomi- austenite at the eutectic temperature.
nantly acicular ferrite and high carbon austenite. (See cementite, n—a very hard and brittle compound of iron and
austempered ductile iron.) carbon corresponding to the empirical formula Fe C, com-
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austempered ductile iron, n—aductilecastironthathasbeen monly known as iron carbide.
produced by a controlled thermal process which results in a cementite, primary, n—cementite precipitated in cast iron
matrix microstructure consisting of predominately acicular during solidification. Also known as primary carbide. (See
ferrite and high carbon austenite. cementite.)
austenitize, vt—to convert the matrix of a ferrous alloy to chill, n—anobject,usuallymetal,imbeddedinaportionofthe
austenite by heating above the transformation temperature. mold to accelerate the local rate of heat removal from the
batch, n—the component raw materials properly weighed, metal being cast.
proportioned, and mixed for delivery to a processing unit. chill, v—to accelerate the freezing rate of cast iron, usually in
Also, the product output from a processing unit in which a localized region, to refine the graphite structure or cause
there is essentially no product output until all component formation of primary carbides.
materials are charged and processed. chill, microstructural, n—a localized region of primary car-
brittle fracture, n—fracture that occurs without appreciable bidesinacastingmadefromacastironthatwouldnormally
plastic deformation of the material. solidify free of primary carbides.
brittle fracture area, n—The fraction or percent of the chilled iron,n—acastironthatwouldnormallysolidifyfreeof
fracture surface that formed by brittle fracture. (When primary carbide which is purposely caused to solidify as
observed with no or low magnification, brittle fracture white cast iron, locally or entirely, by accelerated cooling.
appears whiter and shinier than ductile fracture.) compacted graphite iron, n—a cast iron that has been treated
capability index (C ), n—for a stable process, the specifica- in the liquid state so as to cause its graphitic carbon to occur
p
tion range divided by six times the standard deviation. in the compacted graphite shape in the as-cast condition.
(See graphite, compacted and graphite, spheroidal.)
~USL 2 LSL!
C 5 compound, n—an intimate mixture of all the ingredients
p
6 3 s
necessary for a finished material or product.
capability index (C ), n—for a stable process, the smaller of
pk
compression gasket, n—a gasket designed to be used under
the upper capability index (CPU) or the lower capability
compression.
index (CPL).
compression seal, n—a seal that is attained by a compressive
carbide, primary, n—carbide precipitated in cast iron during
force on the sealing material.
solidification.
confidence level,n—theprobability,orexpectedpercentofthe
cast iron, n—a generic term for a series of alloys primarily of
times, that the selected percent (P%) of the actual popula-
iron, carbon, and silicon in which the carbon is in excess of
tion lies within the tolerance interval calculated from the
data sample.
direct reduced iron, n—iron ores that have been reduced to
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This terminology is under the jurisdiction of ASTM Committee A04 on Iron
essentially metallic iron by heat and reducing agents, but
Castings and is the direct responsibility of Subcommittee A04.91 on Editorial
without melting, and processed into suitable shapes (typi-
Matters and Nomenclature.
cally pellets) for use as a charge material in a melting
Current edition approved Nov. 1, 2005. Published December 2005. Originally
approved in 1971. Last previous edition approved in 2003 as A644-98(2003). operation.
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A644–05
dual metal, n—two metals of different composition that are abatchmeltingprocessorthetotalmoltenmetaloutputfrom
fusion bonded at all interfacial surfaces by casting metal of essentiallyasingleheatinginacontinuousmeltingoperation
one composition against metal of a second composition. using basically constant char
...