Mashinasozlik materiallari


S.D. Nurmurodov, A.X. Rasulov, A.A. Allanazarov “Mashinasozlik materiallari” 1.37-rasm (Toshkent 2020)


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S.D. Nurmurodov, A.X. Rasulov, A.A. Allanazarov “Mashinasozlik materiallari” 1.37-rasm (Toshkent 2020)

2.16-rasm. Ferritni ko’rinishi

Austenit (belgilanishi A yoki γ) - bu uglerodni gamma temirdagi Feγ (suqilib kirish) qattiq eritmasi. Uglerod miqdori 2, 14 % gacha: xarorat pasayishi bilan uglerodni austetitda erish miqdori kamayadi: 11470C da uglerod 2.14 %, 7270C da 0,8 % ga teng. Austetitni ko‘rsatkichlari: ϭv = 370-450 MPa, 5=40-50 %, NV=160- 200.

Austenit (belgilanishi A yoki γ) - bu uglerodni gamma temirdagi Feγ (suqilib kirish) qattiq eritmasi. Uglerod miqdori 2, 14 % gacha: xarorat pasayishi bilan uglerodni austetitda erish miqdori kamayadi: 11470C da uglerod 2.14 %, 7270C da 0,8 % ga teng. Austetitni ko‘rsatkichlari: ϭv = 370-450 MPa, 5=40-50 %, NV=160- 200.

Sementit (belgilanishi S) - temir karbidi - ximiyaviy birikma (Fe3C), undagi uglerod miqdori - 6,69 % murakkab kristall panjaraga ega. Juda qattiq - NV= 800 va mo‘rt.

Grafit (shartli belgisi G).Temir-uglerodli po‘latlarda erkin xolatda ajralib chiqadi. Gegsogonal kristall panjaraga ega, tok o‘tkazadi, yumshoq, mustaxkamligi past bo’ladi.

S.D. Nurmurodov, A.X. Rasulov, A.A. Allanazarov “Mashinasozlik materiallari” 1.38-rasm (Toshkent 2020)

2.17-rasm. Austenit va sementit

S.D. Nurmurodov, A.X. Rasulov, A.A. Allanazarov “Mashinasozlik materiallari” 1.38-rasm (Toshkent 2020) 2.18-rasm Bodroqsimon, sharsimon, chuvalchvngsimon grafit ko‘rinishi

Perlit (shartlibelgisi P) ferrit va sementit fazalarining mexanik aralashmasi. Tarkibida uglerod miqdori S=0,8 % , ϭv = 450-630 MPa, δ=8-10 %, NV=160-220.

Perlit (shartlibelgisi P) ferrit va sementit fazalarining mexanik aralashmasi. Tarkibida uglerod miqdori S=0,8 % , ϭv = 450-630 MPa, δ=8-10 %, NV=160-220.

Ledeburit (belgilanishi L) austenit va sementit fazalarining mexanik aralashmasi. Uglerod miqdori S=4,3 %, HB=180-220.

FOYDALANILGAN ADABIYOTLAR


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