Txoj hauv kev zoo tshaj plaws kom tsis txhob muaj cov kab nrib pleb thaum vuam cov ntaub ntawv overheated yog txwv tsis pub vuam thiab ncaj qha hloov cov khoom. Cov ntaub ntawv overheated twb muaj kev puas tsuaj irreversible xws li grain ciam oxidation thiab voids; welding yuav inevitably ua rau intergranular tawg propagation, compromising yam ntxwv kev ruaj ntseg.
1. Cov hauv paus hniav: Cov khoom siv overheated tsis haum rau vuam
Grain Boundaries yog Fractured: Oxygen tsim cov oxide txuas txuas ntxiv raws li cov ciam teb, tshem tawm tag nrho cov hlau lub zog sib txuas. Vuam kev nyuaj siab yooj yim ua rau intergranular cracking.
Cov Txheej Txheem Tsis Txaus Siab: Lub plasticity ntawm thaj chaw overheated zero; thermal kev ntxhov siab tsis tuaj yeem tso tawm thaum lub caij txias, ua rau muaj kev sib tsoo tshwm sim.
Deterioration ntawm Thaum tshav kub kub-Kev cuam tshuam cheeb tsam: qhov kub ntawm vuam exacerbates uas twb muaj lawm kev puas tsuaj, ua rau void aggregation thiab carbide network nag lossis daus, ntxiv rau cov microstructure tsis muaj zog.
2. Cov tswv yim teb kom raug: Kev Tiv Thaiv + Hloov
Kev ntsuas theem
Kev tiv thaiv: nruj me ntsis tswj cov kub khiav khiav hauj lwm kub (H13 steel Tsawg dua los yog sib npaug rau 600 degree), tsis tu ncua calibrate thermocouples kom tsis txhob overheating.
Hauv - Kev Tshawb Fawb Txheej Txheem: Ua cov tshuaj ntsuam xyuas metallographic sampling txhua 6-12 lub hlis thaum tuaj txog ntawm cov pwm tshiab thiab thaum lub sijhawm ua haujlwm kom pom cov nplej coarsening sai.
Ncej-Kev Teeb Meem: Thaum muaj cua sov dhau lawm, tam sim ntawd khawb cov pwm thiab hloov nrog cov khoom uas tiv thaiv kev loj hlob ntawm cov nplej (xws li H13+Ti, PM-H13).
Lub hauv paus ntsiab lus tseem ceeb: overheating=mus tas li tsis ua hauj lwm; txhua hom kev kho (welding, kho cua sov, machining) yog siab -kev pheej hmoo thiab tsis muaj txiaj ntsig.
3. Pom zoo lwm txoj kev daws teeb meem
Xaiv cov ntaub ntawv ruaj khov: xws li hmoov hlau metallurgy (PM-H13) lossis microalloyed steel (H13+Ti), uas muaj cov qauv zoo thiab zoo li qub microstructure thiab muaj zog tiv thaiv overheating;
Txhim kho qhov ntsuas kub kom zoo: txais kev saib xyuas dual thermocouple redundant, thiab teeb tsa tsis siv neeg tshaj - tswb ntsuas kub thiab lub zog - tawm kev tiv thaiv;
Tsim cov ntaub ntawv lub neej: sau cov lej ntawm lub voj voog cua sov, qhov kub siab tshaj plaws, thiab lub sijhawm ua haujlwm ntawm txhua pwm kom ua tiav kev saib xyuas.
