1. Tshem tawm ntawm Kev Nyuaj Siab
Cov txheej txheem ua haujlwm txias xws li dov, kos duab, stamping thiab dabtsi yog khoov yuav ua kom muaj kev ntxhov siab nyob hauv Monel 400, ua rau muaj kev ntxhov siab sab hauv, muaj kev pheej hmoo ntawm kev ntxhov siab corrosion tawg thiab qhov seem tsis ruaj khov.
Kub kub tempering rau Monel 400 feem ntau yog ua nyob rau hauv qhov kub ntawm 538℃mus rau 649 degree, nrog tuav lub sij hawm txiav txim los ntawm cov khoom thickness thiab ua degree. Ntawm qhov kub no, atomic diffusion yog nrawm, dislocations txav thiab rov kho dua, thiab cov lattice distorted maj mam rov qab los. Cov txheej txheem no zoo tshem tawm qhov seem tensile thiab compressive stresses generated los ntawm yas deformation.
Kev ntxhov siab yog kev txhim kho tseem ceeb tshaj plaws ntawm kev kub siab tempering:
Nws txo qis qhov cuam tshuam rau kev ntxhov siab corrosion tawg (SCC) hauv cov tshuaj chloride, kub alkali thiab lwm yam xov xwm hnyav, txhim kho kev nyab xeeb thiab kev pabcuam lub neej ntawm cov khoom.
Nws ruaj khov qhov tseeb qhov tseeb ntawm qhov chaw, tiv thaiv deformation, warping los yog loj drift thaum lub sij hawm machining, cia thiab ntev - kev pab cuam lub sij hawm, uas yog ib qho tseem ceeb rau precision Cheebtsam thiab welded lug.
2. Kev hloov kho cov cuab yeej cuab tam
Monel 400 tau txais lub zog siab thiab hardness los ntawm kev ua haujlwm txias, tab sis raug kev txom nyem los ntawm kev txo qis ductility thiab toughness. Kev kub siab tempering tuaj yeem hloov kho nws cov khoom siv kho tshuab los ntawm kev tswj kev rov qab thiab ib nrab recrystallization.
Kev txo qis ntawm hardness thiab lub zog: Raws li dislocations raug tshem tawm thiab ua hauj lwm - hardened qauv yog so, lub tensile lub zog, yield zog thiab hardness ntawm txias - ua hauj lwm Monel 400 txo qis nrog nce tempering kub thiab tuav lub sij hawm. Cov nyhuv softening no tso cai rau cov khoom kom rov ua haujlwm tau zoo, ua rau kev txiav tom qab, drilling thiab ua haujlwm yooj yim dua.
Kev txhim kho ntawm ductility thiab toughness: Tom qab kub tempering, elongation thiab txo ntawm cheeb tsam yog noticeably txhim kho. Cov khoom hloov pauv los ntawm nkig, lub xeev nyuaj mus rau ib qho tawv thiab yas, txhim kho nws cov kev tiv thaiv rau kev cuam tshuam kev thauj khoom thiab tiv thaiv nkig tawg hauv kev ntxhov siab. Qhov no yog ib qho tseem ceeb tshwj xeeb rau cov kav xa dej, cov fasteners thiab cov khoom siv hauv hiav txwv uas raug kev vibration thiab poob siab.
Nws yuav tsum tau hais qhia tias Monel 400 tsis tuaj yeem ua kom muaj zog los ntawm qhov kub thiab txias. Yog tias yuav tsum muaj lub zog siab, kev ua haujlwm txias tseem yog thawj txoj hauv kev, thiab tempering tsuas yog siv rau kev ntxhov siab thiab kev sib tw toughness.
3. Txhim khu kev tiv thaiv corrosion
Kev tiv thaiv corrosion ntawm txias- ua haujlwm Monel 400 feem ntau tsis muaj zog vim qhov seem ntawm kev ntxhov siab thiab lattice distortion. Kev kub siab tempering muab ob qho kev txhim kho tseem ceeb:
Ua ntej, kev ntxhov siab tshem tawm kev ntxhov siab- ua rau txoj kev xeb. Residual kev nyuaj siab tuaj yeem ua rau lub zos tawg ntawm cov yeeb yaj kiab passive, ua kom nrawm pitting thiab crevice corrosion. Tom qab tempering, cov yeeb yaj kiab zoo li qub thiab ruaj khov ntawm cov hlau nplaum yog yooj yim rau kev tsim thiab tswj, txhim kho corrosion kuj nyob rau hauv kev txo acids, seawater thiab alkaline ib puag ncig.
Thib ob, tempering homogenizes microstructure. Kev ua haujlwm txias ua rau cov nplej distortion thiab cov khoom tsis sib xws. High kub diffusion txhawb nqa lub homogeneity, txo qis hauv zos galvanic corrosion thiab txhim kho tag nrho corrosion uniformity. Qhov no yog qhov tshwj xeeb tshaj yog muaj txiaj ntsig rau kev siv tshuaj lom neeg ua haujlwm, marine engineering thiab flue gas desulfurization systems.
4. Kev txhim kho ntawm vuam kev ua tau zoo
Welded pob qij txha ntawm Monel 400 yog nquag mus rau residual kev nyuaj siab, hardening thiab kub tawg. Kub kub tempering, tshwj xeeb tshaj yog tom qab-weld heat treatment (PWHT), coj kev txhim kho pom tseeb:
Nws relieves welding residual kev nyuaj siab, txo qhov kev pheej hmoo ntawm weld cracking thiab deformation.
Nws softens lub hardened tshav kub- cuam tshuam cheeb tsam (HAZ), kev txhim kho cov yas thiab toughness ntawm kev sib koom tes thiab kho cov cuab yeej cuab tam sib xws ntawm lub hauv paus hlau thiab vuam.
Nws txo qis kev sib cais hauv cov weld microstructure, txhim kho corrosion kuj zoo ib yam ntawm cov qauv welded thiab tsis txhob muaj kev cuam tshuam hauv cheeb tsam corrosion ntawm lub vuam.
Xaus
Kub kub tempering tsis tsim los nag ntxiv dag zog rau Monel 400, tab sis xa cov kev ua tau zoo tseem ceeb los ntawm kev txo kev ntxhov siab, microstructure rov qab thiab cov cuab yeej homogenization. Nws muaj txiaj ntsig zoo tshem tawm cov kev ntxhov siab seem, txhim kho qhov kev ruaj ntseg, kho cov khoom siv kho kom sib npaug ntawm lub zog thiab kev ua haujlwm, txhim kho corrosion kuj thiab vuam kev ntseeg tau. Rau qhov txias- ua haujlwm thiab welded Monel 400 Cheebtsam, qhov tsim nyog qhov kub thiab txias tempering yog ib qho kev kho cua sov uas tsim nyog los xyuas kom meej cov kev pabcuam thiab kev pabcuam lub neej hauv kev ua haujlwm hnyav.
