Ductile hlau yog ib qho khoom siv hlau uas muaj zog cam khwb cia hauv xyoo 1950s. Nws txoj kev ua tau zoo yog ze rau ntawm cov hlau. Raws li nws cov kev ua tau zoo heev, nws tau ua tiav siv los nrum qee lub zog, lub zog, toughness, hnav tsis kam. Cov khoom siv nrog kev ua haujlwm siab. Ductile hlau tau tsim sai sai rau hauv cov khoom siv hlau cam khwb cia, thib ob tsuas yog grey cam khwb cia hlau. Lub npe hu ua "hloov hlau nrog hlau" feem ntau yog hais txog cov hlau nplaum.
Cov hlau ductile yog tau los ntawm spheroidization thiab inoculation kev kho mob kom tau txais spheroidal graphite, uas zoo txhim kho cov khoom ntawm cov hlau cam khwb cia, tshwj xeeb tshaj yog cov yas thiab toughness, kom lub zog siab dua li cov pa roj carbon steel.
Kev ua haujlwm tseem ceeb
Cov hlau hlau castings yog siv nyob rau hauv yuav luag txhua qhov kev lag luam loj uas yuav tsum muaj lub zog siab, plasticity, toughness, hnav tsis kam, tsis kam rau thermal thiab mechanical shock, tsis kam mus rau siab lossis qis, corrosion resistance, thiab dimension stability. Txhawm rau ua kom tau raws li cov kev hloov pauv no hauv cov kev pabcuam, cov hlau nplaum muaj nyob hauv ntau qib, muab ntau yam khoom siv thiab lub cev.
Feem ntau cov hlau castings, raws li tau teev tseg los ntawm International Organization for Standardization ISO1083, feem ntau yog tsim nyob rau hauv lub xeev unalloyed. Pom tseeb, qhov no suav nrog cov qib siab zog nrog lub zog tensile ntau dua 800 N / mm² thiab elongation ntawm 2 feem pua. Nyob rau lwm qhov kawg yog cov qib ductile heev nrog elongations ntau dua 17 feem pua thiab sib npaug qis zog (tsawg kawg 370 N / mm2). Lub zog thiab elongation tsis yog lub hauv paus rau cov neeg tsim qauv xaiv cov khoom, thiab lwm yam khoom tseem ceeb muaj xws li cov khoom muaj zog, elastic modulus, hnav thiab qaug zog, hardness thiab cuam tshuam cov khoom. Tsis tas li ntawd, corrosion thiab oxidation tsis kam nrog rau cov khoom siv hluav taws xob kuj tseem ceeb rau tus tsim. Txhawm rau kom ua tau raws li cov kev siv tshwj xeeb no, ib pawg ntawm austenitic ductile irons, feem ntau hu ua Ni-Resis ductile irons, tau tsim. Cov austenitic ductile irons, feem ntau yog alloyed nrog npib tsib xee, chromium thiab manganese, tau teev nyob rau hauv cov qauv thoob ntiaj teb.
Nws yog pearlitic ductile hlau nrog nruab nrab thiab siab zog, nruab nrab toughness thiab plasticity, muaj kev ua tau zoo, zoo hnav tsis kam thiab kev co damping, thiab zoo casting txheej txheem. Nws cov khoom tuaj yeem hloov tau los ntawm ntau yam kev kho cua sov. Feem ntau siv rau ntau lub tshuab fais fab crankshafts, camshafts, txuas shafts, txuas rods, zog, clutch phaj, hydraulic kheej kheej thiab lwm yam.
