Isbeddelada qaab -dhismeedyada yar -yar iyo sifooyinka hilmaamidda inta lagu jiro dabaysha

Cafiyoka dib markii la bakhtiiyo, martensite iyo austenite la haysto waa mid aan xasilloonayn, waxay leeyihiin isbeddel urur isbadal ku yimaada oo xasilloonida, sida kaarboonka sare ee martensite si loo soo dajiyo kala-goynta austenite ee hadhay si kor loogu qaado isbeddelka, si loo dheellitiro geeddi -socodka ururka, habkani wuxuu ku xiran yahay guuritaanka atomiga iyo faafinta oggolaanshahan oo ay weheliso heerkulka dabku aad buu u sarreeyaa, xawaaraha faafinta degdegga ah; is -beddello taxane ah. Marka loo eego xaaladda isbeddelka microstructure, dabeecadda guud ahaan waxay u qaybsantaa afar marxaladood: kala -soocidda martensite, kala -soocidda austenite ee hadhay, korriinka uruurinta carbide -ka iyo dib -u -kicinta ferrite.
Marxaladda koowaad (200)
(1) been abuur ahdabeecadda martensite-ka ayaa ka hoosaysa 80 heer-kulka heerkulka, bakhtiinta birta iyada oo aan la beddelin ururkii Ming S, dhacdada kaarboon ee martensite qayb ahaan, oo aan bilaabin inuu ku burburiyo heerkulka 80-200, martensite wuxuu bilaabaa inuu qudhmo, soo dedejiyo carbides aad u khiyaano badan, yaree jajab aad u tiro badan oo martensite ah oo ku jira hilmaaminta kaarboonka marxaladdan, sababtuna tahay heerkulka qallafsan ee hooseeya, roobabka martensitic oo kaliya qayb ka mid ah atamka kaarboon -ka sarreeya, sidaa darteed weli waa kaarboonkii ku jiray - Fe xal aad u sarreeya Roobkii carbide aad u fiican ayaa si isku mid ah ugu qaybiya shaxda ee martensite. Qaab -dhismeedka isku dhafan ee qanjidhada Martensite -ka iyo carbide aad u fiican ayaa la yiraahdaa Martensite.

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(2) been abuur ah qallafsanaanta marxaladda labaad (200-300), kala-soocidda austenite ee hadhay marka heerkulku kor u kaco 200-300, kala-tagga martensite wuu sii socday, laakiin isbeddelka ugu weyn waa kala-soo-baxa austenite ee haraaga austenite ka-soo-baxa wuxuu ahaa iyada oo la ballaariyay atamka kaarboon si loo sameeyo aag qayb ah, ka dibna loo jajabiyo wejiga alfa iyo isku darka ururka carbide, oo ah samayska adkaanta birta bainite si cad uma yara heerkan
(3)Marxaladda saddexaad (250-400) isbeddelka carbide-ka ee ku-shubidda been-abuurka ayaa ku jira heer-kulkan. Sababtoo ah heerkulka sare, kartida baahinta kaarboonka ayaa ka xoog badan, awoodda baahinta si loo soo kabsado atamka birta sidoo kale, martensite waxay burburisaa kala -guurka carbides -da roobka iyo kala -tagga austenite ee hadhay ayaa loo rogi doonaa sibidh deggan oo leh kala -tag iyo is -beddelidda carbides -ka, hoos u dhaca ee martensite ee jajabka tiro kaarboonka ah, dhalanrogkii martensite oo baaba'ay, isbadalkii martensitic ee ferrite, ka hel qaybinta shaxanka ferritic ee granular -ka ama sibidhka lamellar ee ururka, ururka la yidhaa tempering ayaa asal ahaan meesha ka saaray wejigan austenite bakhtiinta walbahaarka, adkaysiga, adkaanta caaga ayaa la hagaajiyay

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(4) Marxaladda afaraad ee ku -shubidda foosha -xun (& GT; 400) ayaa koray carbide la soo ururiyey oo dib -u -cusboonaysiinta ferrite sababtuna tahay heerkulka kulaylku aad buu u sarreeyaa, kaarboon iyo atamka birtu waxay leeyihiin awood xoog leh oo fiditaan ah, samaynta wajiga saddexaad ee jajabyada sibidhku waxay si joogto ah u faafin doonaan oo u kori doonaan In ka badan 500-600, dib-u-cusboonaysiinta alfa ayaa si tartiib tartiib ah u dhacda, lumisa qaab-dhismeedka ferrite ee xariiqa saxanka ama xaashida asalka ah, oo u samaysa qaybinta badarka geeslaha ee hay'ad ahaan sida carbides granular matrix ferritic, kooxda la yidhaahdo temperite sorbite humbite sorbite oo leh farsamo dhammaystiran oo dhammaystiran sifooyinka wajiga iyo dhalanrogidda shabaggu waxay meesha ka saaraan culayska gudaha.

(Laga bilaabo 168 shabakad been abuur ah)


Waqtiga dhejinta: Aug-05-2020

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