Jisho

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Noun
1. pearlitealso written as 波来土
Noun
2. perlite
Wikipedia definition
3. PearlitePearlite is often said to be a two-phased, lamellar (or layered) structure composed of alternating layers of alpha-ferrite (88 wt%) and cementite (12%) that occurs in some steels and cast irons. In fact, the lamellar appearance is misleading since the individual lamellae within a colony are connected in three dimensions; a single colony is therefore an interpenetrating bicrystal of ferrite and cementite.
Read “Pearlite” on English Wikipedia
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