ISO 17804:2020 設立—オースフェライト球状黒鉛鋳鉄—分類 | ページ 6

3.1

ausferritic spheroidal graphite cast iron

austempered ductile iron

ADI

cast material, iron, carbon and silicon based, carbon being present mainly in the form of spheroidal graphite particles, subjected to an austempering heat treatment in order to produce an ausferritic matrix

3.2

graphite spheroidizing treatment

process that brings the liquid iron into contact with a substance to produce graphite in the spheroidal form (predominantly form VI) during solidification

3.3

austempering

<of spheroidal graphite cast iron> heat treatment process, consisting of heating the castings to a temperature at which austenite starts to form during heating and holding a sufficient time for carbon diffusion into the austenite, followed by cooling at a rate sufficient to avoid the formation of pearlite, and transforming the matrix structure for a time and a temperature (above the martensite start temperature) sufficient to produce the desired properties

Note 1 to entry: This process produces a microstructure that consists predominantly of ferrite and high carbon austenite. This microstructure is called “ausferrite”. Examples of ausferritic microstructures are given in ISO/TR 945-3 ^[1].

3.4

ausferrite

cast iron microstructure, produced by a controlled thermal process, which consists of predominantly acicular ferrite and high carbon austenite

3.5

cast sample

quantity of material cast to represent the cast material, including separately cast samples, side-by-side cast samples and cast-on samples

3.6

separately cast sample

sample cast in a separate sand mould under representative manufacturing conditions and material grade

3.7

side-by-side cast sample

sample cast in the mould alongside the casting, with a joint running system

3.8

cast-on sample

sample attached directly to the casting

3.9

relevant wall thickness

section of the casting, agreed between the manufacturer and the purchaser, to which the determined mechanical properties apply

Note 1 to entry: Relevant wall thickness may be associated with a range of casting sections and/or with a sample type and size according to Table 3. The association is made by considering the cooling conditions during solidification and heat treatment.

3.10

test unit

inspection lot

test batch

number of pieces or the tonnage of castings to be accepted or rejected together, on the basis of the tests carried out on the test pieces in accordance with the requirements of the relevant specification, material standard or order