Dab tsi yog dai kom sov -} brittle hloov kub (DBTT)? Thiab dab tsi yog nws qhov tseem ceeb rau A333 Gr.7?
Cov ductile -} brittle transition kub (DBTT) yog qhov tseem ceeb (DBTT) yog qhov kev hloov pauv ntawm cov dav hlau mus rau lub xeev me ntsis. Hauv qab no qhov kub no, cov khoom siv tau kom sai, tsis zoo li brittle bitture. Qhov no yog qhov tseem ceeb tshaj plaws rau A333 Gr.7 steel hlau, raws li nws tau tsim tshwj xeeb rau ib puag ncig muaj nyob deb dbt ntawm cov hlau dog dig. Los ntawm kev sib ntxiv ntawm cov npib tsib xee thiab nruj ua cua sov, A333 Gr.7 ua tiav nws cov DBTT qib qis (zoo hauv qab -101 degree). Qhov no txhais tau tias txawm tias thaum nws tau ua haujlwm tsawg kawg ntawm -101 degree, nws tseem muaj peev xwm ntawm kev nqus lub zog los ntawm kev puas tsuaj yas, ua kom tiv thaiv kev puas tsuaj loj loj. Yog li ntawd, DBTT tsawg yog qhov tseem ceeb rau kev nyab xeeb ntawm A333 Gr.7.
Tus Charpy V - tsis cuam tshuam cov kev sim ntsuas qhov nyuaj ntawm A333 Gr.7?
Lub charpy v - cov khoom cuam tshuam ntawm cov txuj ci rau kev ua kom muaj txiaj ntsig cov khoom siv tawv thiab yog qhov tseem ceeb rau kev txheeb xyuas A333 Gr.7. Qhov kev ntsuas no yuav tsum tau coj tus qauv los ntawm cov raj hlau thiab machining nws rau hauv cov qauv txheej txheem nrog v- tsis tau. Qhov quav me yog tom qab ntawd txias rau -101℃thiab tuav kom sov ua ntej tam sim ntawd ua kom nrawm los ntawm ib tug pendulum. Lub zog nqus ntawm pob txha yog ntsuas (hauv joules). Lub ASTM A333 cov qauv qhia meej tias lub zog nruab nrab nqus tau los ntawm peb tus nqi yuav tsum tsis muaj peev xwm tsawg dua 18 J, thiab tsis muaj lub zog sib luag. Cov ntxaij vab tshaus uas yuav tsum tau ua tiav cov khoom siv nrog cov khoom muaj zog, kom lawv muaj kev nyab xeeb rau kev siv kub tsawg.
Dab tsi yog cov cim microstructural pab txhawb rau qhov qis qis qis - kub nruj ntawm A333 Gr.7?
No superior tsawg - kub tawv tawv tawv tawv los ntawm nws qhov kev ua tau zoo microstruction. Ua ntej, ua ib txwm muaj kho cov khoom lag luam zoo thiab hnav khaub ncaws ferrite thiab pearlite qauv. Cov nplej zoo txhais tau txhais tau tias ntau cov ciaj ciam, ua kom zoo sib txuas lus tawg. Thib ob, cov nyhuv alloy ntawm Nickel ruaj khov rau theem Austenite. Txawm hais tias nws tseem ferrite ntawm chav tsev kub, tsib xee txo cov lattice distortion, enabling cais tawm ntawm qis kub thiab yog li tswj kom muaj plucicity. Tsis tas li ntawd, ua tib zoo tswj cov impurity cov ntsiab (xws li cov lej p thiab s) txo cov micrrefefects thiab tiv thaiv kev tsim ntawm kev ntxhov siab cov ntsiab lus. Qhov no ntshiab, nplua, thiab ruaj khov micrtrubtructure yog qhov xam pom qhov tseeb rau nws qhov kev nyuaj ntawm tsawg kub.
A333 Gr.7 Zam zam li cas brittle fracture hauv qis- qhov kev siv kub?
A333 Gr.7 Siv Ntau Cov Txheej Txheem los tiv thaiv kev cuam tshuam tawg. Ua ntej, nws qhov qis alloy muaj composes}- brrely transition ntsuas kub, khaws cov ntsuas kub. Qhov thib ob, kev kho cua sov nyuaj qhib cov qoob loo loj, nrog cov qoob loo nplej loj, nrog cov hmoov nplej ua yeeb yam raws li kev tawm tsam kom tsis txhob muaj kev sib tw thiab lub zog yuav tsum ua rau pob txha lov. Qhov thib peb, yuav tsum tau sim ua kom ntseeg tau tias txhua pawg ntawm cov khoom sib ntsib qhov tsawg kawg nkaus uas yuav tsum muaj ntawm tus qauv, kom tswj tau zoo. Thaum kawg, tsim qauv engineering kom tsis muaj kev ntxhov siab ntau thiab ua ke cov kev sim tsis muaj qhov tsis xws luag uas tsis muaj peev xwm ua cov khoom tawg. Cov kev ntsuas ua ke ua ke ua ib txoj kev tiv thaiv zoo.
Dhau li ntawm cryogenics, yog A333 Gr.7 lub tawv kuj tseem muaj txiaj ntsig ntawm chav tsev kub?
Yog lawm, nws txoj kev nruj ntawm chav sov kuj tseem muaj txiaj ntsig zoo. Vim tias kev kho cua sov thiab kev kho cua sov, qhov cuam tshuam lub zog hluav taws xob ntawm A333 Gr.7 ntawm qhov uas xav tau ntau dua li ntawm cov khoom siv hluav taws xob ntau tshaj li A106 GR.B. Qhov kev nruj kev siab siab no txhais tau tias nws muaj kev nyab xeeb ntau dua thiab kev nyab xeeb thaum lub sijhawm kev teeb tsa, kev cuam tshuam, lossis kev sib tsoo lossis kev poob qis) ntawm chav tsev kub. Txawm hais tias cov raj xa dej yog nyob rau ntawm chav sov ua ntej pib kev nyuaj ua ntej muaj kev nyab xeeb rau kev nyab xeeb rau kev nyab xeeb thoob plaws nws txoj kev ua haujlwm. Yog li ntawd, nws yog cov khoom siv khov nyob thoob plaws txhua qhov kub.
