Properties, Advantages thiab Applications of Ductile Iron

Ductile hlau, tseem hu ua spheroidal los yog nodular hlau, yog ib pab pawg ntawm hlau alloys nrog ib tug tshwj xeeb microstructure uas muab lawv siab zog, yooj, durability, thiab elasticity. Nws muaj ntau dua 3 feem pua ​​carbon thiab tuaj yeem khoov, twist, lossis deformed yam tsis muaj kev tawg, ua tsaug rau nws cov qauv graphite flake. Cov hlau ductile zoo ib yam li hlau hauv nws cov khoom siv kho tshuab thiab muaj zog ntau dua li cov qauv cam khwb cia hlau.

Cov hlau ductile castings yog tsim los ntawm pouring molten ductile hlau rau hauv pwm, qhov twg cov hlau txias thiab solidifies los ua cov duab uas xav tau. Qhov txheej txheem casting no ua rau cov khoom siv hlau uas muaj zog zoo heev.

Dab tsi Ua Cov Hlau Hlau Cim?

Ductile hlau tau tsim nyob rau hauv 1943 raws li kev txhim kho niaj hnub tshaj li niaj hnub cam khwb cia hlau. Tsis zoo li cam khwb cia hlau, qhov twg graphite tshwm li flakes, cov hlau nplaum muaj graphite nyob rau hauv daim ntawv ntawm spheroids, li no lo lus "spheroidal graphite." Cov qauv no tso cai rau cov hlau nplaum los tiv thaiv kev khoov thiab poob siab yam tsis muaj kev tawg, muab kev tiv thaiv ntau dua li cov hlau cam khwb cia, uas yog qhov ua rau brittleness thiab tawg.

Cov hlau ductile yog tsim los ntawm cov hlau npua, cov hlau purity siab tshaj 90% cov ntsiab lus hlau. Npua hlau yog qhov zoo dua vim tias nws muaj cov seem uas tsis tshua muaj los yog cov khoom tsis zoo, ua kom zoo ib yam, thiab txhawb kev pom cov slag thaum lub sijhawm tsim khoom. Cov khoom siv no yog qhov laj thawj tseem ceeb vim li cas cov khoom siv hlau hlau nyiam npua hlau dua lwm qhov chaw xws li cov hlau seem.

Properties of Ductile Hlau

Cov qib sib txawv ntawm cov hlau nplaum yog tsim los ntawm kev tswj cov qauv matrix nyob ib ncig ntawm graphite thaum lub sij hawm casting los yog los ntawm kev kho cua sov ntxiv. Cov kev sib txawv me me no yog tsim los ua kom tiav cov microstructures, uas nyob rau hauv lem txiav txim siab cov khoom ntawm txhua qib ntawm cov hlau ductile.

Cov hlau ductile tuaj yeem xav tias yog hlau nrog graphite spheroids embedded. Cov yam ntxwv ntawm cov hlau matrix nyob ib puag ncig cov graphite spheroids cuam tshuam rau cov khoom ntawm cov hlau, thaum lub graphite nws tus kheej ua rau nws elasticity thiab yooj.

Muaj ntau ntau hom matrices nyob rau hauv ductile hlau, nrog rau cov hauv qab no yog cov feem ntau:

1. 1. Ferrite- Cov hlau ntshiab matrix uas yog ductile heev thiab saj zawg zog, tab sis muaj zog tsawg. Ferrite muaj kev hnav tsis zoo, tab sis nws cov kev cuam tshuam siab thiab kev yooj yim ntawm machining ua rau nws muaj txiaj ntsig zoo hauv cov qib hlau hlau.
2. 2. Pearlite- Kev sib xyaw ntawm ferrite thiab hlau carbide (Fe3C). Nws kuj yog ib qho nyuaj nrog rau nruab nrab ductility, muab lub zog siab, hnav tsis kam, thiab kev cuam tshuam tsis zoo. Pearlite kuj muab kev ua haujlwm zoo.
3. 3. Pearlite / Ferrite- Cov qauv sib xyaw nrog ob qho tib si pearlite thiab ferrite, uas yog cov matrix feem ntau hauv kev lag luam qib ntawm cov hlau nplaum. Nws muab cov yam ntxwv ntawm ob qho tib si, muab txoj hauv kev sib npaug rau lub zog, ductility, thiab machinability.

Qhov tshwj xeeb microstructure ntawm txhua cov hlau hloov nws lub cev lub zog:

Common Ductile Iron Qib

Thaum muaj ntau qhov sib txawv ntawm cov hlau nplaum, cov chaw tsim khoom niaj hnub muab 3 qib sib txawv:

Qhov zoo ntawm Ductile Iron

Ductile hlau muaj ntau yam txiaj ntsig rau cov neeg tsim khoom thiab cov chaw tsim khoom:

• • Nws tuaj yeem ua tau yooj yim nrum thiab machined, txo cov nqi tsim khoom.
• • Nws muaj lub zog-rau-hnyav piv, tso cai rau cov khoom siv ruaj tsis tau hnav.
• • Cov hlau ua kom muaj qhov sib npaug zoo ntawm cov tawv tawv, kev ua haujlwm zoo, thiab kev ntseeg tau.
• • Nws superior castability thiab machinability ua rau nws haum rau complex qhov chaw.

Daim ntawv thov ntawm Ductile Iron

Vim nws lub zog thiab ductility, ductile hlau muaj ntau hom kev lag luam. Nws yog feem ntau siv rau hauv cov kav dej, qhov chaw tsheb, lub zog, lub twj tso kua mis, thiab lub hauv paus tshuab. Cov hlau tsis kam tiv thaiv kev tawg ua rau nws zoo tagnrho rau kev nyab xeeb kev siv, xws li bollards thiab tiv thaiv kev cuam tshuam. Nws kuj tseem siv dav hauv kev lag luam cua-zog thiab lwm qhov chaw muaj kev ntxhov siab uas qhov kev ua haujlwm ntev thiab yooj yim yog qhov tseem ceeb.