Thaum cov khoom siv steel tau txias ntau dua (quenched) ntawm qhov kub siab heev, ib qho kev ua kom muaj crystalline hu ua Martensitic steel yog tsim. Tus qauv no, hu ua "tus ntaus tswv, "Muab cov hlau ua qee yam tshwj xeeb. Nws yog ib qho kev pom tseem ceeb ntawm cov pa roj carbon monoxide ua ntej tau pom cov pa roj haters (1850-1914) hauv lub 1890s thiab tom qab tau muaj npe hu ua Martensite los ntawm Frenchman F. Osmond los nco txog nws tus tswv yim.
Daim duab 1: Schematic ntawm martensitic steel microstructure. Ferrite thiab bainite kuj tseem tuaj yeem pom muaj nyob rau hauv me me.
Daim duab 2: Microstructure ntawm MS 950/1200
Daim duab 3: Kev sib piv ntawm kev ntxhov siab-strain nkhaus rau cov hlau me me, HSLA 350/450, thiab MS 950/1200.
Hauv qab no yog cov ncauj lus kom ntxaws ntawm martensite
Txhais:
Cov txheej txheem cua sov thiab tom qab ntawd txias txias (quenching) steel los tsim martensitic crystal crystal crystal, ib qho nyuaj, muaj zog steel nrog cov pa roj carbon ntau.
1. Cov yam ntxwv tseem ceeb:
Hardness:
Nws yog lub npe hu ua nyuaj heev rau martensitic steel khoom. Lub quenching txheej txheem solids ua kom haum rau cov qauv uas tiv taus deformation, ua rau cov steel ua kom ruaj khov thiab ruaj khov. Vim tias muaj txoj kev sib raug zoo ntawm Martensite ntawm Martensitite Hardness thiab lees lub zog, ob tuaj yeem sib tham ib txhij.
Hardness ntawm martensite: Cov khoom tseem ceeb tshaj plaws ntawm Martensite hauv cov hlau yog lub siab tawv thiab lub zog. Cov kev sim tau ua pov thawj tias lub hardness ntawm martensite yog txiav txim siab los ntawm nws cov ntsiab lus carbon ntau dua li nws cov ntsiab lus alloying.
Lub zog tensile ntawm txias-tsim martitent martititic steel ntawv rau tsheb tuaj yeem ncav cuag 1700 mpa lossis ntau dua, ua rau nws lub zog siab tshaj plaws rau kev txias. Nws yog lub zog siab tshaj plaws ntawm cov high-zog steels, thiab nws yog "nyuaj tshaj plaws ntawm qhov nyuaj tshaj plaws." Ntxiv rau kev ua "nyuaj", MARDENNITIC steel kuj muaj ntau qhov zoo, xws li muaj lub zog muaj zog, tsis muaj kev laus, zoo weldability.
Lub zog
Cov complex thiab sib txawv ntxiv dag zog rau kev ua kom muaj zog, lub hnub nyoog ntxiv dag zog, ua cov tshuaj muaj zog ntxiv lawm, thiab cov roj ntxiv dag zog. Ua ke, cov tshuab no muab Martensite nws qhov kev nyuaj siab thiab lub zog. Los kho cov steel cov tshuaj muaj pes tsawg leeg, txheej txheem kho cua sov, thiab lwm yam kev txhim kho hauv ntiaj teb no, tsim cov hlau nrog cov khoom siv zoo dua. Cov hlau no muaj zog thiab muaj peev xwm coj cov xeeb hnyav hnyav. Nws yog ib feem ntawm cov cuab yeej, cov cuab yeej, thiab lwm yam uas raug rau kev kub siab lossis hnav.
Brittleness
Martensitic steel yog muaj zog, tseem nws yuav ntau nkig tshaj lwm yam ntawm cov hlau. Yog tias tsis ua kom zoo, nws yuav tawg lossis tawg ua haujlwm hauv qab lossis quab yuam.
Hlau
Cov hlau ntaus hlau sib nqus, uas yog cov yeeb yam uas tuaj yeem pab tau rau qee cov kev siv.
Corrosion Kuj
MMARTENSitic cov hlau yog feem ntau tsawg dua corrosion tiv taus dua lwm cov hlau uas tsis muaj hlau, xws li cov hlau tsis muaj roj. Txawm li cas los xij, qee qib ntawm Martensitic Steel yog tseem siv nyob rau hauv cov chaw uas yuav tsum corrosion tsis kam.
Kev Kho Cua Sov
MARTENENDIC STEEL tuaj yeem kho tshav kub (tempered) hloov nws lub hardness thiab tawv, pub cov neeg tsim khoom kom tsim nyog nws cov kev siv tshwj xeeb.
2. Ordocizational Form
Muaj ob daim ntawv tseem ceeb ntawm martensite hauv cov hlau:
Lath Martite: Laths ntawm ntxhib tib yam loj yog sib xyaw ua ke rau hauv kev qhia, thaum sib ntswg martensite bundles (pab pawg). Thaum cov pa cab pawg feem hauv cov hlau hauv qab no 0. 25%, nws yog tsuas yog hu ua cov roj carbon martens tsawg.
Tsuav Martensite: nws txoj kab peb sab yog ib qho nyias nyias ob chav convex lens. Hauv qab metallographic tsom iav, nws txoj kev hla hla feem ntau muaj kev sib kis-koob lossis xyoob ntoo duab. Hlau kuj tseem hu ua High-carbon martensite vim tias feem ntau lamellar martensite thaum cov pa roj carbon matural ntau dua 1. {4%.
3. Kev tsim cov xwm txheej
Qhov tsim ntawm martensite yuav tsum muaj qee qhov txias thiab sib sib zog nqus supercooling. Tshwj xeeb, cov hlau yuav tsum tau ua kom sov rau lub xeev austenite thiab tom qab ntawd txias rau qhov ntsuas kub hauv qab MS taw tes ntawm tus nqi nrawm dua li cov hlau tus nqi txias. Kev sib sib zog nqus supercooling kom ntseeg tau tias lub zog dawb yog txo thaum tseem ua rau theem txaus hloov kho rau kev sib ntaus sib tua.
4. Kev Ua Tau Zoo thiab Kev Siv
Kev Ua Tau Zoo: Txawm hais tias Martensite-tshwj xeeb tshaj yog cov muaj roj av lamellar martensite-muaj koob meej rau nws lub zog loj thiab hardness, nws kuj yog ib qho qauv nyuaj thiab hlav tawv.
Daim Ntawv Thov: Hauv cov chaw muaj kev muaj zog uas muaj zog, hardness, thiab hnav tsis kam yog corrosion tsis kam, Martensitic Stainless hlau yog siv.
· Txiav cov cuab yeej (piv txwv li, tsis kam. Hnyiab)
· Tshuab seem (piv txwv li, cov khoom siv kho tsheb, cov khoom siv kho mob, lub zog, cov hlau)
· Agancraft seem (piv txwv li, ib qho kev sib txawv ntawm lub tshuab)
· Blades (piv txwv li, txiab, chais plaub)
5. Sau ntawv
Thaum Austenite tig mus rau martensite thaum lub sij hawm quenching, qhov ntim ntawm lub workpiece nthuav dav. Qhov no tuaj yeem ua rau sab hauv kev ntxhov siab, uas yog ib qho ntawm cov laj thawj vim li cas deformation thiab cov kab nrib pleb muaj ntau yuav tshwm sim thaum quenching. Ntau ntau yam, xws li qhov ntsuas kub, txias dua, thiab tshuaj pleev tshuaj pleev ntawm cov hlau, cuam tshuam kev ua tau zoo thiab siv ntawm martensite.
Hauv ib lo lus, martensitic steel, raws li tus qauv tseem ceeb hauv cov khoom siv hlau, muaj cov khoom tshwj xeeb thiab daim ntawv thov tus nqi. Hauv kev siv cov kev siv, nws yog ib qho tseem ceeb los xaiv cov ntaub ntawv tsim nyog thiab cov txheej txheem uas tsim nyog raws li kev xav tau los npaj cov martensitic qauv nrog cov khoom uas xav tau.
MARTENITITIC STEEL RAU COV NTAUB NTAWV APUT
Martensitic cov hlau yog siv dav hauv kev lag luam hauv tsheb vim lawv lub zog tshwj xeeb thiab hardness. Cov khoom no ua rau lawv zoo tagnrho rau kev nyab xeeb-qhov tseem ceeb, tshwj xeeb tshaj yog qhov uas cuam tshuam rau cov kev tsis kam thiab cov qauv txheej txheem kev ua haujlwm yog qhov tseem ceeb. Martensitic microstructures ua tau tiav thaum kub stamping xovxwm-hardening cov hlau.
Piv txwv ntawm cov qeb ntau lawm thiab cov ntawv thov
| Teem nqi | Cov Ntawv Siv Hauv Kev Siv Khoom Automotive |
|---|---|
| MS 950/1200 | Hla-cov tswv cuab, sab kev nkag mus rau kab teeb ci, bumper teeb liab, bumper kev txhawb nqa |
| MS 1150/1400 | Rocker outter panels, sab toter untrenus kab teeb, bumper ci, bumper kev txhawb nqa |
| MS 1250/1500 | Sab Nraum Hlawv Beobs, Bumper Beams, Bumper Txhim Kho |
Cov lus qhia tshwj xeeb rau cov dov txias-rolled, 1st tiam Martensitic Steel
Automotive cov lag luam feem ntau siv Martensitic cov qib steel uas tau raws li Tensile lub zog yuav tsum tau ua. Hauv qab no yog qee cov kev qhia tshwj xeeb uas piav qhia txog cov pob txias-dov martensitic steels:
ASTM A980M: Qib 190 [900], 160 [1100], 190 [1300], thiab 220 [1500].
VDA 239-100: Suav nrog cov ntsiab lus xws li cr 860} y1100t-ms, cr1230y1300t-ms, cr1220y1500 thiab cr13700t-ms.
SAE J2745: Nrog MARSENSITE GRADES xws li MS 900T / 700, 1100T / 860 y, 1300t / 1000t / 1200.
Cov qauv no rau automakers 'cov kev cai tshwj xeeb rau tensile lub zog thiab kev ua yeeb yam.
Nrhiav rau kev txhim khu kev siv tsheb loj? Tus neeg yus paubTshaj tawmRau cov qib kev cai thiab ntau!
