Thaum tshav kub kub kho Temper Brittleness thiab Kev Pabcuam Kev Nyab Xeeb Ciam Tebchaws ntawm Cov Kabmob Clips nyob rau hauv qis -Tsub Ib puag ncig
Vim li cas elastic clips nrog temper brittleness pom muaj kev pheej hmoo tawg heev nyob rau hauv qis - qhov kub thiab txias?
Temper brittleness yog qhov tseem ceeb ntawm nag lossis daus ntawm impurity ntsiab (piv txwv li, phosphorus, antimony) ntawm cov ciam teb, txo cov qoob loo ciam teb lub zog thiab hloov pauv hom tawg ntawm "ductile" mus rau "intergranular brittle." Nyob rau hauv qis kub, cov hlauDuctile -Brittle Transition Temperature (DBTT)nce loj heev. Yog hais tias temper brittleness elevates DBTT rau -20℃thaum qhov kev pab cuam kub yog -40 degree, lub clip yog nyob rau hauv ib tug tag nrho nkig lub xeev. Lub zog cuam tshuam los ntawm cov tsheb ciav hlau thauj khoom tsis tuaj yeem nqus tau los ntawm cov yas deformation tab sis ncaj qha ua rau cov ciam teb tawg, ua rau cov pob txha tawg sai sai uas tsis muaj kev ceeb toom, uas yog qhov txaus ntshai heev.
Yuav ua li cas cov tshuaj muaj pes tsawg leeg tsim ntawm elastic clip cov ntaub ntawv tsis txhob muaj kev pheej hmoo ntawm temper brittleness ntawm qhov chaw?
Qhov chaw zam kev tsom mus rau "Tsawg impurities + alloying inhibition. Ua ntej, nruj me ntsis tswj cov khoom tsis zoo hauv cov ntaub ntawv raw (P Tsawg dua lossis sib npaug rau 0.015%, S Tsawg dua lossis sib npaug rau 0.010%, Sb Tsawg dua lossis sib npaug li 0.002%) kom txo cov khoom hauv paus rau cov nag ciam teb. Thib ob, ntxiv cov kabMolybdenum (Mo)los yogtungsten (W), uas tsim cov tebchaw ruaj khov nrog impurities, tiv thaiv lawv kev sib cais rau cov ciam teb. Rau cov clips tshwj xeeb rau thaj tsam alpine, microalloyed bainitic steel yog pom zoo rau cov tsoos pearlitic steel, vim cov qauv bainitic inherently muab superior qis - kub toughness thiab kuj rau temper brittleness.
Nyob rau hauv kev kho cua sov, yuav ua li cas kom tsis txhob kub siab brittleness rhiab cheeb tsam los ntawm optimizing lub tempering system?
Optimization tsom rau "zam qhov kub thiab txias cheeb tsam + ceev txias"Tseeb tempering ntawm 350℃-450℃yooj yim ua rau temper brittleness.siab -kub temperingntawm 550℃-600 degree, kom tsis txhob muaj 300℃-500℃rhiab heev. Tom qab tempering,roj txias los yog dej pos huab cua txiasNws yog ib qho tsim nyog kom ceev cov clip los ntawm tempering kub kom qis dua 100 degree, tiv thaiv impurity diffusion thiab segregation thaum txias txias. Qhov no "siab-kub tempering + ceev txias" ua ke ua kom pom lub zog zoo-toughness tshuav nyiaj li cas thiab tshem tawm temper brittleness.
Yuav ua li cas los txiav txim qhov kev nyab xeeb ciam teb ntawm elastic clips ntawm qhov sib txawv ntawm qhov kub thiab txias los ntawm "series impact tests"?
CovCharpy V-ntiv tes ntsuas ntsuasyog siv los npaj cov ductile - brittle transition curve. Cov qauv los ntawm tib pawg yog kuaj ntawm qhov kub thiab txias (20℃, 0℃, -20℃, -40℃, -60℃), thiab kev cuam tshuam lub zog raug kaw. Qhov "kev cuam tshuam lub zog-kub" nkhaus qhia txog DBTT. Qhov kev pabcuam kev nyab xeeb ciam teb yog txhais raws li: qhov ntsuas kub ntawm qhov kev pabcuam yuav tsum yog yam tsawg kawg nkaus10℃saum DBTT. Piv txwv li, yog hais tias ib tug clip's DBTT yog -35 degree, nws qhov kev nyab xeeb yam tsawg kawg nkaus kev pab kub yog -25 degree; siv nws hauv thaj tsam -40℃alpine yog suav tias tsis muaj kev nyab xeeb, yuav tsum tau hloov cov khoom siv lossis rov kho dua.
Nyob rau hauv - thaj chaw saib xyuas hauv thaj av alpine, dab tsi tshwj xeeb pom thiab tapping txoj hauv kev muaj rau cov hlua elastic?
Hauv thaj tsam alpine, cov neeg saib xyuas tsom mus rau kev txheeb xyuas cov cim ntxov ntawm "xav tias muaj pob txha tawg." Visually, clips nrog temper brittleness yuav tsimnetwork tawg yam tsis muaj yas deformation, tshwj xeeb tshaj yog nyob rau hauv arc hloov chaw (cov cheeb tsam kev ntxhov siab). Rau tapping, ib tug flaw detection rauj ntaus lub clip: ib txwm clips emit aclear metallic suab, thaum brittle clips tsim ibnpub, luv suabvim muaj kev nce hauv brittleness. Clips nrog lub suab txawv txav lossis microcracks yuav tsum tau kuaj tam sim rau qhov cuam tshuam rau qhov hnyav dua - tshuaj xyuas kom tsis txhob muaj kev puas tsuaj loj.