1.Vim li cas thiaj li yuav tsum tau ua kom zoo zoo nplej?
Ua kom muaj zog: Cov nplej nplua nuj txhais tau tias ntau thaj tsam ntawm cov nplej, uas cuam tshuam kev txav mus los, yog li ua kom cov khoom muaj zog thiab tensile zog.
Txhim kho Plasticity: Thaum ua kom muaj zog, nplua - cov ntaub ntawv nplej feem ntau muaj qhov zoo elongation thiab formability (tshwj xeeb tshaj yog cov yas deformation muaj peev xwm), zam qhov "muaj zog tab sis nkig" profile.
Optimized Stamping Performance: Qhov no yog qhov taw qhia tseem ceeb rau kev sib sib zog nqus- kos duab / ultra- sib sib zog nqus- kos cov ntawv hlau xws li tsheb thiab cov khoom siv hluav taws xob. Fine, uniform equiaxed ferrite nplej kom zoo heev n-tus nqi (hardening index) thiab r-tus nqi (yas strain ratio) thaum lub sij hawm stamping, txo qhov kev pheej hmoo ntawm wrinkling thiab cracking.
Nce Toughness: Cov nplej nplua nuj txo cov ductile- hloov pauv kub ntawm cov khoom, txhim kho nws qhov cuam tshuam toughness ntawm qhov kub thiab txias.
Txhim kho Surface Quality thiab Performance Consistency: Ib qho microstructure tsis zoo ua rau cov khoom sib xws ntau dua thiab cov khoom zoo.
2.Yuav ua li cas cov nplej refinement tiav?
Kub Rolling thiab Coiling (Tshaj lub hauv paus rau cov txheej txheem Upstream):
Los ntawm kev tswj qhov kawg dov kub thiab txias tus nqi, zoo thawj zaug austenite thiab ferrite nplej tau txais, npaj rau yav tom ntej precipitate tswj.
Txias Rolling Deformation (Lub Zog Cia thiab Kev Npaj Microstructure):
Qhov no yog thawj kauj ruam tseem ceeb tshaj plaws. Qhov kub- dov coil yog dov thinner siv tus nqi txo ntawm 60%-80% lossis siab dua.
This process drastically elongates and breaks down the original grains, creating a high density of dislocations and deformation bands within the crystals, storing a large amount of distortion energy. Cov high-cov qauv hluav taws xob deformed no yog lub zog tsav rau kev rov ua dua tshiab tom ntej.
Recrystallization Annealing (Them kawg kauj ruam hauv Grain Refinement):
Qhov no yog cov txheej txheem tseem ceeb tshaj plaws, feem ntau ua tiav hauv txoj kab txuas txuas ntxiv (CAL) lossis lub tswb - thiab - hlawv rauv (BAF).
Lub tshuab chilled, hardened strip yog rhuab saum qhov kub ntawm recrystallization (piv txwv li, kwv yees li 700℃rau qis-carbon steel) thiab tuav ntawm qhov kub ntawm lub sijhawm.
Tsav los ntawm kev khaws cia distortion zog, tshiab, strain-dawb, zoo equiaxed nplej (recrystallization nuclei) pib tsim nyob rau hauv cov khoom, maj engulfing lub puag ncig deformed qauv. Los ntawm kev tswj hwm tus nqi cua sov, qhov kub thiab txias, tuav lub sijhawm, thiab tus nqi txias, qhov loj, morphology, thiab kev ntxhib los mos ntawm cov nplej recrystallized tuaj yeem tswj tau meej.
Qhov sib txawv me ntsis hauv cov txheej txheem annealing tuaj yeem tsim cov qib sib txawv ntawm cov khoom xws li lub zog siab mus rau siab plasticity.
Tom qab-kev kho mob (kev tswj ntxiv):
Leveling Rolling: me ntsis txias deformation (0.5% -3% elongation) tom qab annealing tshem tawm cov yield plateau, txhim kho nto tiav, thiab ntxiv refines lub substructure.
Kev Kho Mob Kev Laus/Baking Hardening: Rau qee qib steel, tswj tus cwj pwm nag lossis daus ntawm C thiab N atoms ua rau muaj zog ntxiv thaum lub sij hawm tom ntej txheej ci.
3.Yuav ua li cas dav dav -lub hom phiaj txias- dov steel ntawv (SPCC, thiab lwm yam) ua tiav?
Lub hom phiaj tseem ceeb ntawm cov nplej refinement yog los xyuas kom meej qhov yooj yim lub zog thiab formability, thaum tuav cov txheej txheem kuj txheem.
4.Yuav ua li cas sib sib zog nqus- kos duab / ultra- sib sib zog nqus- kos cov ntawv hlau (xws li tsheb DC04, DC06, IF steel)?
Qhov no sawv cev rau lub pinnacle ntawm grain refinement tswj. Nws yuav tsum tau txais cov ntxhib, zoo ib yam, thiab zoo textures thiab equiaxed ferrite nplej kom ua tau zoo heev r thiab n qhov tseem ceeb. Qhov no yuav tsum muaj cov hlau tsis huv heev (IF steel) thiab cov txheej txheem tshwj xeeb rolling thiab annealing.
5.Yuav ua li cas rau cov txheej txheem siab -lub zog steel (xws li siab -lub zog IF steel, duplex steel DP, kev hloov pauv-induced plasticity steel TRIP)?
Grain refinement yog lub hauv paus tseem ceeb rau kev ntxiv dag zog. Nyob rau tib lub sijhawm, kev tswj xyuas meej ntawm cov txheej txheem annealing thiab cua txias kuj tseem yuav tsum tau muaj nyob rau hauv cov hlau no kom tau txais cov kev xav tau ntawm cov txheej txheem multiphase xws li martensite thiab bainite, uas ua ke nrog cov nplua -grained ferrite matrix kom ua tiav qhov zoo tshaj plaws sib npaug ntawm lub zog thiab plasticity.