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allotropik şəkildəyişmelerine ta'siri
Domirdo holl olan bütün elementler onun allotropik sokildayis
melorinin yerloşdiyi temperatur hadlorino to'sir göstororok, A, vo A
nögtelorinin yerini temperatur skalası üzre deyişir.
Bir sıra elementler (Mn, Ni, Pt) A böhran nögtasini qaldırır vo
A, nöqtəsini iso asagi salaraq. Y allotropik şokildoyişmosinin yer-
laşmo sahosini genişləndirir (sakil 130a). Şekilden göründüyü kimi,
bu elementlerin müəyyən miqdarında orimo temperaturundan otaq
temperaturunadok arinti stabil y-nin strukturundan, ya'ni legirlonmiş
austenitden ibarat olur. Demir osaslı belo ərintiloro austenit sinifli
ərintiler deyilir. Si, Al, Be, Sn, W. V. Ti, Sb vo s. elementlor A
nöqtəsini endirir vo A, nöqtəsini yuxarı qaldıraraq y-domirin yerlos.
diyi sahani daraldır, a-nin mövcud oldugu saheni ise genişlendirir
(sokil 130b). Gösterilen elementlərin müeyyen miqdarında bütün
temperaturlarda a-şəkildoyişmosi dayanıqlı olub, strukturu legirlon
miş ferritden ibaretdir. Demir asasi bele orintilor ferrit sinifli
arintilor adlanır. Demir osaslı basqa nov orintilorden forqli olaraq
austenit va ferrit sinifli erintilordo qızdırma vo soyutmada faza
çevrilmalari olmur. Hal-hazırda demirlo legirləyici elementlerin hal
diaqramı geniş yayılmışdır. Bunlardan: Fe-Ni, Fe-Mn, Fe-Cr,
Fe-Mo, Fe-Si və s. sistemlerini göstermek olar.
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