Izinguquko ku-micostosition nezakhiwo zokuthethelela ngesikhathi sokwehla

Ukuxolelwangemuva kokuqothula, ukubulawa komzimba kanye nokugcina i-austenite kungazinzile, banomqondo wokuguqulwa kwenhlangano ngokuzimela, njengokuphakama kwendabuko kumartensite ukuze kunqume ukubola okusalelayo ukuze kuqhubekele phambili ukugqugquzela ukufuduka, njengokukhuza i-tempering tempering kuyinhlangano engalingani ukulinganisa izinqubo zenhlangano, le nqubo incike ekufudukeni kwe-athomu kanye nokufakelwa kwalesi sigunyazo ndawonye nokushisa kwakho okuqediwe kuphezulu, isantya sokumelana kokunye; Ngokuphambene nalokho, kanye nokwanda kokushisa okushisa, isakhiwo sokuxolelwa sentando bhekana nochungechunge lwezinguquko. Ngokwesimo sokushintshwa kwe-micostosition, ukuwa kwethanga kuvame ukuhlukaniswa ngezigaba ezine: ukubola kwe-martensite, ukubola okusalelayo kokukhula, ukukhula kokuqongelelwa kwe-carbide nokukhula kabusha kwe-ferrite.
Isigaba sokuqala (200)
(1) ekwakheni kwesisekelo sokwehla kwezinga lokushisa komhlaba sisebenza ngaphansi kwesilinganiso sokushisa sama-80, ukuqeda insimbi ngaphandle kokuguqulwa kwenhlangano ye-Ming S, ukuvela kwe-carbon in martensite ngokwengxenye, futhi akukho okuqala ukubhidlika lapho kufika isishingishane se-80-200, martensite uqala ukubola, ukucacisa ukunqotshwa kwe-carbides ecashile kakhulu, ukunciphisa ingxenyana enkulu ye-martensite ekuthetheleleni kwekhabhoni kulesi sigaba, ngenxa yokushisa okuncane, isizulu semartensitic kuphela ingxenye yama-athomu wekhabhoni e-supersaturated kwezulu kwe-carbide enhle kakhulu isabalalisa ngokulinganayo ku-matrix ye-martensite. Isakhiwo esixubekile se-satellite ephansi iMartensite ne-carbide enhle kakhulu sibizwa ngokuthi yi-Tempens Martensite.

1

(2) ukwakhiwa kokuphakama esigabeni sesibili (200-300), ukubola okusalelayo okuyi-austenite lapho izinga lokushisa lenyuka laya ku-200-300, ukubumbana kokudalwa kwezimpawu kuyaqhubeka, kepha ukushintshana kokuwohloka kokuwohloka kwezinsalela kokudalwa okuseleyo ku-austenite kudalwe ukunwetshwa kwama-athomu wekhabhoni ukwakha indawo enenxenye, bese kubekwa esigabeni se-alpha nengxube yenhlangano ye-carbide, okungukuthi ukwakheka kobulukhuni bensimbi engagugi ngokusobala kwehla kulesi sigaba
(3) Isigaba sesithathu (250-400) ukuguqulwa kwe-carbide I-forging tempering ikuleli banga lokushisa. Ngenxa yokushisa okuphezulu, amandla we-athomu we-Carbon atom anamandla, amandla okufakelwa kokubuyisa i-athomu yensimbi futhi, ukubola okuyi-martensite ukubola kokuguqulwa kwe-carbides yezulu kanye nokubola okusalelayo kuyoshintshwa ku-cementite eqinile ngokuhlukaniswa nokuguqulwa kwe-carbides, ukuncipha ye-martensite in carbon mass ingxenyenamba, i-martensite lattice ehlanekezela, ukuguqulwa kwe-martensitic for ferrite, thola ukusatshalaliswa kwamatrix we-ferritic ngaphakathi kwengxenyeni encane ye-granular noma lamellar yenhlangano, inhlangano ebizwa ngokuthi i-tempering yaqeda ngokuyisisekelo lesi sigaba i-austenite yokuqothula ukucindezela, ubulukhuni, ukuqina kwamapulasitiki kwathuthukiswa

1

(4) Isigaba sesine sokwenza i-tempering (ne-GT; 400) sikhule i-carbide iqoqwe futhi iphinda iphinde ifakelwe kabusha i-ferrite ngenxa yokushisa kwesikhashana iphezulu kakhulu, ama-athomu ekhabhoni nensimbi anekhono eliqinile lokwanda, ukwakheka kwesigaba sesithathu kwama-cementite flakes ngokuqhubekayo I-spheroidizing futhi yakhulela ngaphezu kwe-500-600, ukuphindaphinda kwe-alpha kwenzeka kancane kancane, kulahlekelwe yi-ferrite morphology ye-strip yangempela yephepha noma ishidi, futhi kwakha ukusatshalaliswa kokusanhlamvu kwe-polygon enhlanganweni njengenhlangano ye-carrides ye-ferritic matrix izakhiwo ezinhle ezibanzi zemishini yesigaba nokuhlanekezela okuphelisa usawoti kususa ukucabanga kwangaphakathi.

(Kusuka ku-168 yokwakha inetha


Isikhathi sokuthumela: Aug-05-2020

  • Previous:
  • Okulandelayo:

  • WhatsApp Online Chat!