Khoom Taw Qhia

FCD500 ductile hlau poob ciab peev casting

FCD500 hlau hlau

Thaum lub casting yog txias, qhov saum npoo thiab nyias ntu feem ntau tsim cov qhov dawb. Cov ntaub so ntswg dawb tawv thiab nkig, ua haujlwm tsis zoo, yooj yim rau flake. Yog li ntawd, txoj kev annealing (los yog normalizing) yuav tsum tau siv los tshem tawm cov ntaub so ntswg dawb. Cov txheej txheem annealing yog: cua sov rau 550-950 degree C rau 2 ~ 5h, thiab tom qab ntawd txias rau 500-550 degree C thiab tom qab ntawd cua txias. Thaum lub sij hawm kub kub tuav, cov cementite dawb, eutectic cementite thiab eutectoid cementite kuj decompose thiab graphitization tshwm sim. Cov cuab yeej cuab tam ntawm castings yog txhim kho vim cementite. Qee lub sij hawm normalizing kuj yog qhov kev npaj ntawm ductile hlau nto quenching ntawm tus qauv, normalizing kub normalizing thiab tsis kub normalizing. Lub siab kub normalizing kub feem ntau tsis ntau tshaj 950 ~ 980 degree, thiab qhov kub tsis tshua muaj normalizing feem ntau rhuab mus rau co-folding kub ntau ntawm 820 ~ 860 degree . Tom qab normalizing, nws yog feem ntau yuav tsum tau nqa tawm tempering kev kho mob kom tshem tawm cov internal kev nyuaj siab generated thaum lub sij hawm normalizing, thiaj li mus cuag lub high-temperature rocky desertification annealing ntawm lub qhov ncauj dawb ntawm lub casting.

quenching thiab tempering ntawm cov hlau hlau

Txhawm rau txhim kho cov khoom siv hluav taws xob ntawm cov khoom siv hlau, qhov dav dav casting yog rhuab mus rau 30 ~ 50 degree saum toj no Afc1 (Afc1 sawv cev rau qhov kawg kub tsim los ntawm A thaum cua sov), thiab cov qauv martensitic tau txais tom qab tshav kub preservation. Txhawm rau kom txo qis cov kev ntxhov siab seem tom qab quenching, qhov dav dav quenching yuav tsum tau tempered, thiab qhov kub tsis tshua muaj tempering qauv yog tempered martensite ntxiv rau cov seem bainite thiab kheej kheej graphite. Cov qauv no muaj qhov hnav tsis zoo thiab yog siv rau cov khoom uas yuav tsum tau hnav tsis kam thiab siab zog. Lub tempering kub yog 350-500 degree, thiab cov qauv tempered yog tempered trootenite thiab kheej kheej graphite, uas yog haum rau tuab qhov chaw uas yuav tsum tau zoo hnav kuj thiab muaj tej yam zoo stability thiab elasticity. Qhov kub-kub tempering kub yog 500-60D degree , thiab cov qauv tempered yog tempered Soxhlet li spherical graphite, uas muaj kev ua tau zoo ntawm kev sib txuas ua ke thiab lub zog, yog li nws tau siv dav hauv kev tsim khoom.

Cov qauv ntawm cov hlau cam khwb cia nyob ntawm qhov degree ntawm graphitization, thiaj li yuav tau txais cov qauv tsim nyog, tus yuam sij yog tswj cov qib ntawm graphitization. Nws tau raug pov thawj tias ntau yam xws li tshuaj lom neeg muaj pes tsawg leeg ntawm cam khwb cia hlau, qhov cua txias ntawm cam khwb cia hlau crystallization thiab superheating thiab sawv ntawm molten hlau cuam tshuam rau graphitization thiab microstructure ntawm cam khwb cia hlau.

1. Kev cuam tshuam ntawm cov tshuaj muaj pes tsawg leeg

Ntawm C, Si, Mn, P thiab S hauv cam khwb cia hlau, C thiab Si yog cov ntsiab lus uas txhawb nqa graphitization, thiab S yog cov ntsiab lus uas cuam tshuam graphitization. Qhov tseeb, kev cuam tshuam ntawm txhua lub ntsiab lus ntawm graphitization muaj peev xwm ntawm cam khwb cia hlau yog qhov nyuaj heev. Nws lub hwj chim muaj feem xyuam rau cov ntsiab lus ntawm txhua lub ntsiab lus nws tus kheej thiab seb nws cuam tshuam nrog lwm cov ntsiab lus, xws li Ti, Zr, B, Ce, Mg, thiab lwm yam, uas cuam tshuam graphitization, tab sis yog tias nws cov ntsiab lus tsawg heev (xws li B, Ce<0.01%, Ti<0.08%), they also show a role in promoting graphitization.

2. Cov nyhuv ntawm qhov txias txias

Feem ntau hais lus, qhov txias ntawm qhov casting yog qeeb qeeb, qhov zoo tshaj plaws rau crystallization thiab kev hloov pauv raws li Fe-G ruaj khov system xeev daim duab, thiab tag nrho graphitization; Ntawm qhov tsis sib xws, nws yog qhov tsim nyog rau crystallization thiab hloov pauv raws li Fe-Fe3C metastable system xeev daim duab, thiab thaum kawg tau txais cov hlau dawb. Tshwj xeeb tshaj yog nyob rau hauv eutectoid theem ntawm graphitization, vim qhov kub tsis tshua muaj, nce cua txias, atomic diffusion nyuaj, yog li nyob rau hauv ib txwm muaj xwm txheej, eutectoid theem ntawm graphitization yog qhov nyuaj rau kev ua tiav.

Cov cua txias ntawm cov hlau cam khwb cia yog ib qho tseem ceeb, uas muaj feem xyuam rau qhov kub thiab txias, thermal conductivity ntawm cov khoom hloov mus thiab cov phab ntsa thickness ntawm cov casting. Thiab feem ntau cov xwm txheej no yog ob qho kev txiav txim

Cov nyhuv ntawm ntu yog qhov pib zoo ib yam.

Zhongwei Precision muaj cov kev pabcuam hauv qab no

Detection Systems

Copper Silica Sol Investment Casting

Peb yog cov chaw tsim khoom ntawm "FCD500 Ductile Iron Castings", yog tias koj xav tau cov ntaub ntawv ntxiv thov hu rau peb!