1. Dab tsi yog qhov sib tw metallurgical ntawm 4140 Alloy Steel, thiab vim li cas thiaj zam tau cov txheej txheem nyiam rau nws cov kab?
AISI 4140 yog ib qho muaj ntau yam thiab dav siv qis qis-} Alloy Alloy Alloy- molybenum (chromoly) tsev neeg. Nws cov khoom yog muab tau los ntawm cov tshuaj lom neeg sib npaug tsim los teb zoo rau kev kho cua sov.
Tseem ceeb alloying ntsiab thiab lawv lub luag haujlwm:
Cov pa roj carbon (0.38-0.43%): Muab cov peev xwm siv rau Hardness thiab lub zog los ntawm kev tsim cov carbides thiab lub martensitic transformation thaum quenching.
Chromium (0.80 {{- 1. feem ntau yog txhim kho cov neeg nyuaj, tso cai rau cov tuab dhau los mus dhau ntawm-tawv. Nws tseem yuav txhim kho kev txhim kho corrosion marginally thiab pab txhawb rau kev ua kom muaj kev ua kom sov theem nrab.
Molybdenum (0.15 - 0.25%): tus muaj zog tiv thaiv tau zoo dua. Nws tseem yuav txo qis kev pheej hmoo ntawm kev npau taws uas muaj kev kub ntxhov uas tuaj yeem tshwm sim thaum tempering hauv qee qhov kub thiab txias) thiab txhim kho siab kub lub zog.
Manganese (0.75-1.00%): AIDS hauv kev ua haujlwm tsis muaj zog thiab pab rau deagidize cov hlau thaum melting.
Vim li cas kev zam?
Forging yog txheej txheem ntawm cov hlau sib txawv siv cov hlau compoundized zog, feem ntau los ntawm rab rauj lossis tuag. Rau 4140 tuav, Forging yog superior rau dov lossis ua rau ntau qhov laj thawj:
Refined Grade qauv: kev forging forging txheej txheem rhuav tshem cov li - ntxhum micros ntawm tus thawj ingot, thiab kaw hauv voids hauv voids. Qhov no ua rau kev txuas ntxiv mus ntxiv, cov duab kos duab ntws uas ua raws li cov contour ntawm bar.
Txhim kho ntom ntom: cov rog compressive tshem tawm cov microporosity thiab roj hnab ris, tsim ib qho denser, cov khoom siv homogeneous ntau dua.
Txhim kho cov khoom siv neeg kho tshuab: lub ntsej muag zoo nkauj: cov khoom ua kom zoo nkauj thiab kev txhim kho tau yooj yim heev los txhim kho ductility, cuam tshuam nyuaj, thiab qaug zog ntawm cov nplej. Qhov no ua rau cov kab tshuam forged deb tsawg dua li ua tsis tau zoo nyob rau hauv cyclic loading piv rau kev cam lossis tshuab}- phaj} phaj phaj tivthaiv.
Kev Ncaj Ncees: Forging tsim tawm ib qho bar nrog lub suab nrov zoo dua, tsis muaj kev sib cais thiab cov teeb meem sib cais uas tau muab cov khoom pov tseg.
2. Rau dab tsi tseem ceeb daim ntawv thov yog 4140 forged tuav tshwj xeeb xaiv?
4140 Forged cov tuav yog cov khoom siv ntawm kev xaiv rau high- lub zog, siab (qaug zog) lo, feem ntau hauv kev xav tau ib puag ncig. Lawv siv yog ubiquitous hla hnyav kev lag luam.
Thawj cov ntawv thov muaj xws li:
Roj & Roj Kev Lag Luam: Laum Collars, cuab yeej pob qij txha, cov pob qij txha, thiab cov twj tso kua mis. Cov tib yam no yuav tsum muaj zog sib txawv, kev tsis kam ua rau poob siab, thiab kev lim dej zoo, txhua yam yog muab los ntawm forged microstructure.
Lub zog kis tau: Zog, pinks, shafts, thiab hnyav {{{} Duty} Luag Axles. Kev sib xyaw ua ke ntawm lub zog siab thiab cov tub ntxhais zoo ua kom nruj kev tso cai rau cov khoom siv no los xa cov khoom siv siab thiab kev ua haujlwm tsis zoo thiab tergional qaug zog.
Aerospace thiab defense: tsaws iav Cheebtsam, lub cav dav hlau mounts, thiab cov chaw nres nkoj. Kev ntseeg tau thiab muaj pov thawj kev ua tau zoo ntawm Forged 4140 ua rau nws muaj kev ntseeg siab rau kev nyab xeeb kev nyab xeeb.
Tooling thiab Machinery: Tuag, Pwm, tshuab Tool ntxaiv, thiab Hydraulic xovxwm Cheebtsam. Cov hlau lub peev xwm yuav tsum tau txais machined nyob rau hauv annealed xeev thiab tom qab ntawd tawv rau lub siab tawv tawv muaj txiaj ntsig.
Kev sib tw tsheb: high {{- Kev ua yeeb yam crankshafts, txuas cov pas nrig, thiab Cheebtsam ncua kev ncua. Kev qaug zog tsis kam ntawm forged bar yog qhov tseem ceeb rau ciaj sia lub siab- kev ntxhov siab ib puag ncig ntawm kev sib tw cav.
Qhov kev txiav txim siab siv ativ thaiv4140 bar dhau ib kub - rolled ib yog tsav los ntawm qhov tseem ceeb ntawm daim ntawv thov. Yog tias ib qho chaw sib hauj lwm yuav ua rau muaj kev phom sij, lossis cov teeb meem kev puas tsuaj, cov khoom siv hluav taws xob tsis zoo, cov khoom lag luam zoo tshaj yog tsis yog}.
3. Dab tsi cov txheej txheem kho cua sov tau thov rau 4140 Forged cov tuav, thiab lawv yuav hloov tau nws cov khoom zoo li cas?
Qhov tseeb muaj peev xwm ntawm 4140 tau xauv los ntawm kev kho cua sov. Qhov chaw forged yog feem ntau muab rau hauv qhov anealed lossis normalized thiab tempered mob los pab yooj yim machining. Kev kho cua sov kawg yog ua tom qab ntu yog machined rau nws ze {{}} kawg duab.
Peb qhov kev kho cua sov thawj yog:
Annealing: rhuab mus kwv yees li 845℃(1550℃f) thiab maj mam txias hauv qhov cub cua. Qhov no tsim cov khoom muag muag, coarse hlaws puab nrog cov hardness tsawg (feem ntau 187-229 HB). Lub hom phiaj yog kom ua kom siab dua coothient thiab npaj cov microstructure rau tom ntej tawv.
Quenching thiab tempering (Q & T): Qhov no yog cov kev kho mob ntau dua ntxiv dag zog.
Austenitizing: ib feem yog rhuab rau ~ 845℃f), hloov nws micrubtructure rau Austenite thiab yaj tus carbides.
Quenching: Nws tau txias sai (quenched) hauv cov roj. Roj yog siv vim tias cov dej tuaj yeem ua rau tawg vim tias cov hlau lub siab nyuaj. Qhov kev hloov pauv no tsim kev nyuaj heev tab sis brittle Micructure hu ua Martensite.
Tempering: Lub quenched ib feem yog tam sim ntawd re-}}}}}}℃(400℃f thiab 1200℃f) thiab tuav, tom qab ntawd {txias. Qhov kev ntxhov siab no relieves sab hauv kev ntxhov siab thiab tso cai rau carbides rau nag lossis kev hloov pauv loj heev rau hauv cov tawv tawv "tempered." Qhov kawg hardness thiab lub zog yog ncaj qha txiav txim los ntawm qhov ntsuas kub siab:
Tsawg frim (205 {4 4}} 425} 425} 425} 425-800 hardness (HRC 45-55), siab zog, qis nruj. Siv rau hnav-resistant Cheebtsam.
Siab siab (540-650℃/ 1000-1200℃(HRC 28-35), siab zog, thiab kev tsis kam zoo thiab cuam tshuam tsis kam. Siv rau cov qauv txheej txheem zoo li Shafts thiab zog.
Li qub: rhuab mus rau ib qho kev sib xws zoo ib yam thiab thaum ntawd cua - txias. Qhov no ua kom pom cov noob loj thiab txhim kho tshuab luam ntawv dhau li -} forged mob, tab sis muab tsawg zog dua Q & T.
4. Kev ua tau zoo li cas ntawm 4140 piv rau lwm cov neeg tsim qauv hlau xws li 1045 thiab 4340?
4140 Nyob hauv av theem qis hauv qhov chaw ua yeeb yam spectrum ntawm hlau.
vs . 1045 (Nruab Nrab Carbon Steel): 1045 tau qis dua cov tawv tawv vim tsis muaj qhov tsis zoo ntawm cov chromium thiab molybdenum. Nws tsuas yog nyob saum npoo - hatchen rau qhov tob tob, thiab cov khoom zoo dua los ntawm tsis yog} {tseem ceeb shafts thiab ntu; 4140 yog rau high - kev siv kev ntxhov siab hauv cov txheej txheem.
vs . 4340 (Nickel {{chromium {}} moly moly moly tab sis ntxiv ~ 1.8% npib tsib xee. Nickel zoo heev txhim kho kev nruj me me, tshwj xeeb tshaj yog qhov ua tau zoo tshaj plaws ntawm ultra {},} Lub dav hlau tsaws iav, armor). Txawm li cas los xij, nws los ntawm lub siab dua tus nqi siab dua. 4140 yog feem ntau tus nqi ntxiv uas nws tau zoo heev yog qhov txaus.
Ntsiab lus: 4140 yog tus ua haujlwm siab high - muaj zog tsawg - alloy all allloy. Nws muab kev tshuav zoo tshaj plaws ntawm lub zog, kev coj nruj, thiab kev xaiv zoo dua li no {}}} almoys zoo li 4340 rau ntau daim ntawv thov.
5. Dab tsi tshwj xeeb tswj thiab kuaj pom tau qhov tseeb ntawm 4140 forged bar?
QC rau 4140 forged bar yog kom ntseeg tau tias nws ua tau raws li cov cuab yeej ua haujlwm rau nws cov kev pabcuam tseem ceeb.
Tshuaj Ntsuam Xyuas Tshuaj: Daim ntawv pov thawj los ntawm Optical Emission Spectrometry (Oes) kom paub tseeb qhov muaj pes tsawg leeg yog nyob rau hauv nqaim AISI 4140 kev txwv tshwj xeeb txwv.
Kev kuaj Hardness: Brinell (HB) lossis Rockwell (HRC) kev sim ua kom ntseeg tau tias qhov kev nyuaj siab ntawm nws cov khoom noj (piv txwv li, annealed).
Kev kuaj xyuas sab nraud thiab kev kuaj pom rau qhov loj me, ncaj, thiab zoo nkauj (swb, lossis cov kab nrib pleb tsis tsim nyog).
Tsis - Kev sim tshuaj (ndt):
Kev sim ultrasonic (U): Qhov no yog qhov tseem ceeb rau cov pob txha loj loj. Ib transducer xa cov siab - zaus suab tsis los ntawm cov khoom. Reflections los ntawm sab hauv cov tsis muaj cuab yeej tsis zoo xws li suav nrog, cov kav dej piping, lossis voids tau tshwm sim ntawm lub vijtsam. Siv ua kom muaj kev ntseeg siab sab hauv.
Sib nqus particate (MPI): siv los tshawb xyuas nto thiab ze {{{}} qhov tsis xws luag ntawm cov khoom tiav. Ntu yog magnetized, thiab hlau hais yog thov. Txhua qhov chaw nyob tsim cov chaw xau dej uas nyiam cov lus, ua kom pom kev pom.
Kev Kuaj Txhua: Rau cov ntaub ntawv muaj ntawv muaj ntawv, ib daim coupon xeem tawm los ntawm qhov kawg ntawm kev Forging thiab raug kho kom sov. Daim coupon no tau siv rau:
Tensile Xeem: Los ntsuas tawm lub zog, lub zog kawg tensile lub zog, thiab elongation.
Charpy V - Cov Cuam Tshuam Tsis Yooj Yim Cov Lus Qhia Kev Ntsuas Cov Cuam Tshuam Ntawm Ib Chav (feem ntau chav {1} xoom).
Absetetetch Test: Tus ntoo khaub lig- ntu ntawm cov nplais thiab tsis muaj kev zam rau sab hauv thiab qhov tsis muaj kev cuam tshuam nrog kev sib cais sab hauv zoo ib yam li kev sib cais lossis porosity.
Qhov no cov roj teeb zoo ntawm cov ntawv pov thawj uas pom tau tias 4140 forged bars uas yuav tsum muaj tshuaj, kho tshuab, thiab sab hauv cov ntawv thov zaum kawg.
