Nyob rau hauv cov toj roob hauv pes dynamic ntawm high - zaus watred yeeb nkab ntau lawm hauv Welds tau ntev kev cov nyom rau cov kev sib tw. Txawm li cas los xij, cov kev tshawb fawb tshawb fawb tsis ntev los no tau hais txog qhov ua rau pom, paving txoj kev daws teeb meem zoo thiab ua tau zoo dua.
Lub tswv yim ntawm Micrititioning anomy: Martensite tsim hauv Welds
Hauv - qhov tob ntsuas metallographic soj ntsuam ntawm siab- fuage welds, ib qho qauv nyuaj, nyob rau sab saud thiab qis dua. Thaum lub sij hawm siab - zaus vuam cov txheej txheem ntawm cov npoo ntawm Weld Surfaces, ua rau kev tsim ntawm cov qauv martensitic no. Qhov kev hloov pauv no yog qhov tseem ceeb tshaj plaws ua rau muaj peev xwm txhim kho kev sib nraus ntawm kev sib tsoo.
Lub hauv paus ua rau: Chaw Segregation nyob rau hauv nruam Casting Billets
Kev tshawb nrhiav delved ntxaum rau hauv cov txheej txheem solidification ntawm nruam casting billets, qhov twg alloy ntsiab nyob rau hauv lub nroog capet ua piv txwv pom zoo. Rau 22 steel, carbon (c) (c) thiab manganese (mn) yog thawj cov ntsiab lus sib luag. Lub C thiab MN cov ntsiab lus tau ua rau muaj kev cuam tshuam rau kev hloov pauv mus ntxiv (CCT) nkhaus, hloov mus rau qis {{yawg} txoj cai. Cov kev ua haujlwm no txhim kho kev ruaj ntseg ntawm Austenite ntawm kev kub ntxhov ntawm kev kub ntxhov thaum lub sij hawm vuam, ncua sij hawm hloov pauv lub sijhawm hloov pauv. Nyob rau hauv lub chaw - segregated cheeb tsam, tus nqi ntawm MN uas ua rau muaj kev sib tw txias thiab txo cov kab mob kom haum rau kev tawg.
Txoj saw tshuaj: los ntawm kev cais tawm los ua kom pib
Qhov chaw sib cais ntawm kub kub - rolled sawb steel ua ib qho chaw seem ntawm lub routitudinal shear band ntawm ntug kev hlau. Post -} vuam, thaum tus weld txias los ntawm dej, muaj kev ntxhov siab sab hauv kev hloov pauv hauv cov chaw cais tawm. Muab hais tias martensite tsim los ntawm quenching muaj kev sib xyaw ua ke ntawm cov chaw sib txuas ntawm Weld ua kev sib txuas ntawm Weld kev sib tsoo uas muaj kev sib txuas ntawm Welded Yeeb Nkab.
Mitigation Lub Tswv Yim 1: Kev Ua Haujlwm Nrov Nro Nrov
Txhawm rau tawm tsam cov teeb meem no, cov kws tshaj lij kev lag luam tau npaj ua ob -} pronged mus ze. Thawj lub tswv yim tseem ceeb tsom rau txo qhov chaw sib cais ntawm kub kub- rolled sawb steel thaum nruam cov txheej txheem txuas ntxiv. Qhov no entails zoo {{Tawb Tawb Nruam Nruam Nruam Nruam Nruam Casting, suav nrog kub, casting ceev, thiab cua txias dej ntws. Los ntawm kev tswj cov hloov pauv no, cov tuam ntxhab tuaj yeem txo cov kab ke ntawm cov khoom siv square, thiab kom muaj lub hauv paus sab hauv zoo nkauj rau kev tawg.
Mitigation Lub Tswv Yim 2: Hloov Cov Sawb Hlau Dav
Qhov kev ntsuas zoo thib ob cuam tshuam cuam tshuam nrog kev kho qhov dav ntawm kub - rolled sawb steel. Hloov chaw ntawm cov pa hluav taws xob ntev txiav ntawm txoj kab nruab nrab, cov tawv nqaij strip tuaj yeem muab faib ua ib daim hlab khib. Qhov kev ua haujlwm tshiab no kom ntseeg tau tias lub chaw - segregated band ntawm lub siab - zaus watded raw khoom sawb. Piv txwv li, 1, {8} mm {}}}}}} mm- dav strip. Qhov no yooj yim tau hloov kho cov xwm txheej uas ua rau muaj kev sib tsoo, muab lwm txoj hauv kev kom zoo dua los txhim kho qhov siab- zaus welded kav.
Kev txheeb xyuas ntawm cov hauv paus ua rau thiab cov qauv ntawm cov kev sib tiv thaiv kev tiv thaiv tau tawm tsam cov kev hloov pauv siab {}} cov yeeb nkab welded yeeb nkab ntau lawm kev lag luam. Los ntawm kev siv cov tswv yim no, cov chaw tsim khoom tuaj yeem cia siab tias muaj kev txhawb nqa tseem ceeb hauv kev ua lag luam muaj peev xwm ntau lawm. Kev lag luam insiders qhia txog cov kev tshawb fawb txuas ntxiv no thiab kev tswj tshiab nyob rau hauv vuam siv thev naus laus zis thiab kev tsim kho kom ruaj khov ntawm welded yeeb nkab kev tsim khoom.
