Ukufakwa kwe-Anealing okungaphelelanga kunye ne-Spheroidizing eAnealing yeMetal Castings

Ukufakwa okungaphelelanga kweeNsimbi zokuCasa

Ingcaciso:

Anealing engaphelelanga ainkqubo unyango ubushushu for castings steel, okubandakanya ukufudumeza intsimbi kuluhlu lweqondo lokushisa phakathi kwe-Ac1 kunye ne-Ac3 (yensimbi ye-hypoeutectoid) okanye i-Ac1 kunye ne-Accm (yentsimbi ye-hypereutectoid), ukuyipholisa ngesantya esicothayo sokupholisa esingaphantsi kwe-50 ℃ / h emva kokubamba de iqondo lokushisa liyehla. ngaphantsi kwe-500 ℃ kwaye emva koko uyikhuphe eziko ukuze uphole umoya. Le nkqubo ijolise ekufumaneni isakhiwo esikufutshane nelizwe lokulingana.

Iimpawu zokuqinisekisa:

Ekubeni izinga lokushisa lokufudumala likummandla wesigaba sesibini, isakhiwo sensimbi asiguqulwanga ngokupheleleyo kwi-austenite. Kuphela inxalenye ye-pearlite idlula ukuguqulwa kwesigaba kunye ne-recrystallization, iguqulelwe kwi-austenite, ngelixa i-morphology kunye nokusabalalisa kwe-proeutectoid ferrite okanye i-cementite ihlala ingatshintshi.

Isicelo:

I-annealing engaphelelanga isetyenziswa kakhulu njengendlela yonyango ngaphambi kokucinywa kwentsimbi ye-hypereutectoid, kwaye ukusetyenziswa kwayo kwintsimbi ye-hypoeutectoid ayinqabile.

 

I-Spheroidizing annealing ye-Metal Castings

Ingcaciso:

I-Spheroidizing annealing yinkqubo ethile yonyango lobushushu ejolise ekwenzeni i-carbides kwifom yentsimbi yeengqungquthela ze-spherical, ngaloo ndlela ifumana isakhiwo se-pearlite yegranular. Enyanisweni, luhlobo oluthile lwe-annealing olungaphelelanga.

Isicelo:

Le nkqubo isetyenziselwa ikakhulu insimbi ye-eutectoid, intsimbi ye-hypereutectoid kunyeingxubevange isixhobo steel castings, ejolise ekunciphiseni ubunzima bezinto eziphathekayo, ukuphucula ukusebenza kokusika, ukuqinisekisa isakhiwo esifanayo, ukwandisa ukusebenza kwenkqubo yokushisa ukushisa, kunye nokubeka isiseko esihle sombutho kwinkqubo yokucinywa okulandelayo.

Iinkcukacha zenkqubo:

Ubushushu bokufudumala bufuna ukulawulwa ngokuchanekileyo, ngokuqhelekileyo buphezulu kancinci kunobushushu be-Ac1 ngama-20 ukuya kuma-30 °C, kwaye indlela yokufudumeza iziko iyamkelwa.

Ixesha lokubamba akufanele libe lide kakhulu, ngokuqhelekileyo ligcinwe phakathi kwe-2 kunye ne-4 iiyure.

Kukho iindlela ezahlukeneyo zokupholisa, kodwa ukupholisa iziko okanye unyango lwe-isothermal lwexesha elide malunga ne-20 °C ngaphantsi kwe-Ar1 yindlela eqhelekileyo.

Isitshixo se-spheroidizing annealing kukuqinisekisa ukuba inani elaneleyo lamanqaku e-carbide angachithwanga agcinwe kwi-austenite, okubangela ukusabalalisa okungafaniyo kwe-carbon concentration ukukhuthaza i-spheroidization ye-carbides.

Ukufudumala kwiqondo lokushisa eliphezulu okanye ukubamba ixesha elide kuya kubangela ukuba inani elikhulu le-carbides lichithe, zenze i-austenite efanayo, ukunciphisa i-spheroidization core kunye nokuchaphazela umphumo we-spheroidization.

Ubume kunye nobukhulu beengqungquthela ze-cementite zichaphazelekayo yizinga lokupholisa okanye ukushisa kwe-isothermal. Ukupholisa ngokukhawuleza okanye ubushushu obuphantsi be-isothermal buthanda ukwenza i-flaky carbides, okukhokelela ekunyukeni kobunzima.