Utshintsho kulwakhiwo lwe-micost kunye neempawu zokuxolelwa ngexesha lokufumana

Uxoleloemva kokucima, umartensite kunye nokugcinwa kwe-austenite kungazinzanga, banomgaqo ozenzekelayo wenguqu kumgangatho wozinzo, njengokupakishwa kwekhabhoni kwimartensite ukuze kuqale ukubola okushiyekileyo komgangatho ukuze kukhuthazwe ukutshintsha, njengokumanzisa umlo ngumbutho ongalinganiyo Ukulungelelanisa iinkqubo zombutho, le nkqubo ixhomekeke ekufudukeni kweatomic kunye nokwahluka kwesi sigunyaziso kunye nogqitywe ubushushu bomlilo liphezulu, isantya sokuphambuka kwendlela; Ngokuchaseneyo, kunye nokonyuka kwamaqondo obushushu, ukwakhiwa kokuxolelwa kuya Yiya kuthotho lweenguqu. Ngokweemeko zenguqu yemo yokuboniswa kwezinto eziphilayo, ukubekwa kwesahlulo ngokubanzi kwahlulahlulwe ngokwamanqanaba amane: ukubola kwe-martensite, ukubola okusalelayo kokutsala, ukukhula kokuqokelelwa kwe-carbide nokukhula kwakhona kwe-ferrite.
Inqanaba lokuqala (200)
(1) nzini martensite ukubola phantsi kobushushu be-80, ukucima i-iron ngaphandle kwenguqu yombutho we-Ming S, ukuvela kwekhabhoni kwimartensite kuphela ngokuyinxenye, kwaye akukho kuqalisa kokophula u-80-200 tempering, martensite uqala ukubola, ukuhambisa kuqala i-carbides ecekeceke kakhulu, ukunciphisa inani le-martensite ekuxolelweni kwekhabhoni kweli nqanaba, ngenxa yeqondo lokushisa eliphantsi, ukubethelwa kwe-martensitic kuphela yinxalenye yeatom zekhabhoni e-supersaturated, ngoko iseyikharbon kwisisombululo esiqinileyo se-Fe Ukuhanjiswa kwe-carbide entle kakhulu kusasazeka kwi-matrix ye-martensite. Isakhelo esixubileyo seSartensite esezantsi kunye neCarbide entle ibizwa ngokuba yiMartensite.

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(2) Ukudalwa kokudumba kwinqanaba lesibini (200-300), ukubola okushiyekileyo kwe-austenite xa amaqondo obushushu enyuka esiya kuma-200 ukuya kwangama-200, ukubethelwa kwemartensite kuyaqhubeka, kodwa utshintsho olugqibeleleyo kukuwohloka okuseleyo kokuwohloka okushiyekileyo kwenzeka ukwandiswa kweeatom zekhabhoni ukwenza indawo enomda, kwaye emva koko kugqitywe kwisigaba se-alpha kunye nomxube wombutho we-carbide, oko kukuthi ukwakhiwa kobunzima bentsimbi engagungqisi ngokuqinisekileyo kuyancipha kweli nqanaba
(3) Inqanaba lesithathu (250-400) utshintsho lwe-carbide ofging of tempering kukoluhlu lweqondo lokushisa. Ngenxa yobushushu obuphezulu, amandla e-Carbon atom infusion omelele ngakumbi, amandla okubethelelwa ukubuyisela iiatom zentsimbi kwakhona, imartensite decompise yokutshintshwa kwe-carbides ye-precipitation kunye nentsalela yokutsalwa kwe-austenite iya kuguqulwa ibe sisamente eqinileyo ngokuchaseneyo kunye noguquguquko lwe-carbides, ukuncipha ye-martensite kwi-carbon ubukhulu, i-martensite lattice ukuphambuka, i-martensitic inguqu ye-ferrite, fumana ukuhanjiswa kwe-matrix ngaphakathi kwe-granular okanye i-lamellar cementite yombutho, umbutho obizwa ngokuba yi-tempering ngokusisiseko uphelise uxinzelelo lwe-austenite ukucima uxinzelelo, ubunzima

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(4) Inqanaba lesine lokudala i-tempering (& GT; 400) ikhule i-carbide eqokelelene kwaye iphinda ibeke kwakhona kwindawo ekusetyenzwa kuyo ngenxa yeqondo lokushisa liphezulu kakhulu, i-atom yecarbon kunye ne-iron inamandla okunyusa, isigaba sesithathu sokwakheka kweeflethi zesamente. spheroidizing kwaye yakhulela ngaphezulu kwe-500-600, ukuphinda kwenziwe i-alpha kwenzeka kancinci, ilahleko ye-ferrite morphology ye-strip yentsusa okanye iphepha, kwaye yakha ukusasazwa kwengqolowa ye-polygon kumbutho njenge-ferritic matrix granular carbides, iqela elibizwa ngokuba yi-tempering sorbite temped sorbite kunye Izinto ezilungileyo zoomatshini abaziinxalenye zesigaba kunye nokugqabhuka koolusu kususa uxinzelelo lwangaphakathi.

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Ixesha lokuposa: Aug-05-2020

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