Cov ntaub ntawv overheated tsis tuaj yeem muaj lawv cov khoom rov qab los ntawm kev kho cua sov txawm tias tom qab vuam vim qhov kev puas tsuaj tsis tuaj yeem xws li cov ciam teb oxidation, voids, lossis cov melting hauv zos twb muaj nyob rau hauv. Kev kho cua sov tsis tsuas yog ua tsis tau los kho cov teeb meem no xwb tab sis kuj tseem tuaj yeem ua rau lub microstructure deterioration ntau dua.
1. Vim li cas kev kho cua sov tsis zoo?
Irreversible grain ciam teb oxidation: Oxygen tau tsim ib tug nruam oxide network nyob rau hauv lub grain ciam teb, uas kev kho cua sov tsis tuaj yeem tshem tawm, uas ua rau poob ntawm intergranular bonding.
Remelted spheres tsis tuaj yeem raug tshem tawm: Cov cheeb tsam tsis muaj zog tsim tom qab lub zos melting thiab solidification yog nquag mus softening dua thaum lub sij hawm tom qab cua sov, ua rau cov yam ntxwv instability.
Kev kho cua sov tuaj yeem ua kom muaj kev puas tsuaj loj: Kev rov ua kom sov tuaj yeem ua rau cov voids mus rau hauv cov pob zeb thiab cov kab nrib pleb kom nthuav tawm, tshwj xeeb tshaj yog thaum txias thaum muaj kev ntxhov siab tuaj yeem ua rau tawg tshiab.
Txawm hais tias normalizing lossis annealing tsis tuaj yeem rov ua kom muaj kev ncaj ncees ntawm cov qoob loo thiab tuaj yeem ua rau "thib ob overheating."
2. Kev pheej hmoo ntawm kev sib txuas thiab kev kho cua sov
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Theem |
Risk Manifestation |
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Vuam txheej txheem |
Ntxiv oxidation ntawm tshav kub- cuam tshuam cheeb tsam, ua rau intergranular tawg |
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Tshaj tawm -Kev kho cua sov |
Exacerbates microstructure inhomogeneity, ua rau cov kab nrib pleb tshiab los yog ua rau muaj qhov tsis zoo uas twb muaj lawm los nthuav tawm |
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Thaum Kev Pabcuam |
Cov pob qij txha ua heev nkig, muaj kev puas tsuaj tam sim ntawd txawm nyob rau hauv me ntsis loads |
Kev pom zoo Engineering Kev Pom Zoo: Cov ntaub ntawv kub dhau tsis muaj nqi kho; txhua hom kev ua haujlwm tom ntej (xws li vuam thiab kev kho cua sov) tsis zoo thiab txaus ntshai.
3. Cov txheej txheem kho kom raug
Direct Scrap: Thaum overheating tau lees paub, cov khoom siv yuav tsum tau muab tshem tawm tam sim ntawd thiab hloov cov khoom siv;
Hloov nrog cov khoom siv los tiv thaiv -grain loj hlob: xws li H13+Ti, PM-H13, thiab lwm yam., txhawm rau txhim kho siab - qhov kub thiab txias;
Txhim kho qhov chaw tswj: Kev tswj qhov kub thiab txias (H13 steel Tsawg dua lossis sib npaug li 600 degree), kev ntsuas kub tsis tu ncua, thiab tsim cov ntaub ntawv ntsuas kub.
