Raws li qib ntawm cov ntsiab lus carbon, carbon steel raucastingFeem ntau muab faib ua cov pa roj carbon tsawg, nruab nrab carbon steel thiab siab carbon steel. Cov cam khwb cia carbon steels ntawm tag nrho cov teb chaws nyob rau hauv lub ntiaj teb no yog feem ntau muab faib raws li lawv lub zog, thiab coj cov qib yog formulated.
Hais txog cov tshuaj muaj pes tsawg leeg ntawm carbon steel, tshwj tsis yog rau phosphorus thiab sulfur, tsis muaj kev txwv lossis tsuas yog txwv sab saud ntawm lwm cov tshuaj. Nyob rau hauv cov ntaub ntawv saum toj no, cov tshuaj muaj pes tsawg leeg ntawm cam khwb cia carbon steel yog txiav txim los ntawm lubchaw tsim khoomraws li qhov xav tau cov khoom siv kho tshuab.
Txoj kev kho cua sov ntawm carbon steel castings feem ntau yog annealing, normalizing lossis normalizing + tempering. Rau qee qhov siab carbon steel castings, quenching thiab tempering tuaj yeem siv tau, uas yog, quenching + kub tempering, thiaj li los txhim kho cov khoom siv kho txhua yam ntawm carbon steel castings. Me carbon steel castings tuaj yeem ncaj qha quenched thiab tempered los ntawm lub xeev li-cam khwb cia. Rau loj-scale los yog complex-shaped carbon steel castings, nws yog tsim nyog los ua quenching thiab tempering kev kho mob tom qab normalizing kev kho mob.
Cov nyhuv ntawm carbon rau microstructure thiab cov khoom ntawm carbon steel
1) Kev cuam tshuam ntawm carbon rau cov qauv ntawm cov hlau
Carbon yog lub ntsiab tseem ceeb uas txiav txim siab cov qauv metallographic thiab cov khoom ntawm cov hlau. Nyob rau hauv qhov ntau ntawm hypoeutecoid steel, raws li cov ntsiab lus carbon nce, tus txheeb ze ntawm ferrite txo qis thiab cov txheeb ze ntawm pearlite nce. Thaum ncav cuag eutectoid muaj pes tsawg leeg, txhua yam yog pearlite. Nyob rau hauv cov hypereutectoid ntau, raws li cov ntsiab lus carbon nce, tus txheeb ze tus nqi ntawm proeutectoid cementite nce thiab cov txheeb ze ntawm pearlite txo.
2) Cov nyhuv ntawm cov pa roj carbon monoxide rau cov khoom siv hluav taws xob ntawm cov hlau
Cov pa roj carbon monoxide cuam tshuam rau cov khoom siv hluav taws xob ntawm cov hlau los ntawm kev cuam tshuam cov nqi txheeb ze thiab cov yam ntxwv ntawm kev faib tawm ntawm txhua yam khoom siv hauv microstructure. Feem ntau, raws li cov ntsiab lus carbon nce, qhov hardness ntawm carbon steel yuav nce, tab sis nws cov cuam tshuam lub zog thiab elongation yuav txo. Lub zog tensile thiab lub zog tawm los yuav ua ntej nce thiab tom qab ntawd txo qis raws li cov ntsiab lus carbon hauv carbon steel nce.
3) Cov nyhuv ntawm cov pa roj carbon monoxide rau kev txiav cov pa roj carbon steel castings
Tsawg-carbon steel muaj ntau ntawm ferrite, tsis tshua muaj hardness, zoo plasticity, thiab yooj yim sticking, yog li nws cov kev ua tau zoo kuj tsis zoo. Muaj ntau cementite nyob rau hauv high carbon steel. Thaum cov cementite muab faib rau hauv flake thiab network, cov cuab yeej yog ib qho yooj yim rau hnav, yog li nws cov kev ua tau zoo kuj tsis zoo. Qhov piv ntawm ferrite thiab cementite nyob rau hauv nruab nrab carbon steel yog qhov tsim nyog, hardness thiab plasticity kuj yog nruab nrab, thiab txiav kev ua tau zoo dua. Qhov kev ua tau zoo yog qhov zoo tshaj plaws thaum lub hardness ntau ntawm steel castings yog 180-230 HBW.
4) Kev cuam tshuam ntawm cov pa roj carbon rau kev ua haujlwm ntawm cov hlau
Nyob rau tib qhov kub, qhov fluidity ntawm molten steel nrog cov ntsiab lus carbon sib txawv. Vim tias cov hlau uas muaj cov ntsiab lus carbon sib txawv muaj qhov sib txawv ntawm kev loj hlob hauv dendrites. Qhov siab dua qhov kub ntawm qhov chaw crystallization (qhov kub qhov sib txawv ntawm cov kua kab thiab cov kab solidus), qhov ntau tsim cov dendritic crystals ntawm cov pa roj carbon steel, uas yog, qhov fluidity ntawm cov hlau molten yuav ua rau cov hlau tsis zoo. muaj peev xwm ntawm cov hlau molten los sau pwm.
