Laser cladding yog ntau yam txheej txheem siv nyob rau hauv kev lag luam kev lag luam los txhim kho cov khoom saum npoo ntawm cov hlau los ntawm kev tso tawm ntawm ib txheej ntawm cov khoom, feem ntau nyob rau hauv daim ntawv ntawm hmoov feedstock. Cov yam ntxwv ntawm cov hmoov siv hauv cov txheej txheem no ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab microstructure thiab yog li cov khoom ntawm txheej clad. Tsab ntawv xov xwm no tshawb txog qhov cuam tshuam tseem ceeb ntawm cov yam ntxwv ntawm cov hmoov ntawm microstructure ntawm laser-clad hlau, txhawb nqa los ntawm cov ntaub ntawv thiab kev pom zoo.
Cov yam ntxwv hmoov thiab microstructure tsim
Lub microstructure ntawm lub laser-clad hlau feem ntau yog nyob ntawm kev sib cuam tshuam ntawm laser beam thiab cov khoom siv hmoov. Ntau yam tseem ceeb hmoov cov yam ntxwv cuam tshuam qhov kev cuam tshuam no:
Particle Loj thiab Kev faib tawm: Qhov loj ntawm cov hmoov nplej cuam tshuam rau lawv cov cwj pwm melting thiab tsim lub pas dej molten thaum lub sij hawm laser cladding. Cov khoom me me yuav yaj tau yooj yim dua, txhawb kev sib zog sai thiab muaj peev xwm ua rau lub microstructure zoo dua. Hloov pauv, cov khoom loj dua tuaj yeem xav tau ntau lub zog tawm tswv yim kom yaj tag, cuam tshuam rau thermal dynamics thiab ua rau coarser microstructure.
Tshuaj muaj pes tsawg leeg: Cov tshuaj muaj pes tsawg leeg ntawm cov hmoov txiav txim siab cov tshuaj tiv thaiv metallurgical uas tshwm sim thaum melting thiab solidification. Alloying ntsiab tam sim no nyob rau hauv cov hmoov yuav hloov cov theem muaj pes tsawg leeg, grain loj, thiab faib nyob rau hauv lub clad txheej. Piv txwv li, cov ntsiab lus xws li chromium los yog npib tsib xee tuaj yeem tsim carbides lossis intermetallic theem, cuam tshuam rau ob qho tib si hardness thiab corrosion kuj.
Flowability thiab Packing ceev: Powder flowability thiab packing density influences uniformity and density of the clad layer. Cov dej tsis zoo tuaj yeem ua rau tsis sib xws ntawm cov hmoov, ua rau muaj qhov tsis xws luag xws li porosity lossis tsis tiav fusion. Optimal packing density ua kom muaj qhov sib npaug ntawm cov khoom, qhov tseem ceeb rau kev ua tiav qhov xav tau microstructural zog.
Oxide Cov ntsiab lus thiab Morphology: Oxide cov ntsiab lus ntawm cov hmoov av tuaj yeem cuam tshuam qhov zoo ntawm cov txheej txheej. Cov ntsiab lus oxide siab tuaj yeem ua rau muaj kev sib koom ua ke thiab porosity hauv txheej txheej, ua kom tsis muaj zog ntawm cov khoom siv thiab txo cov kev tiv thaiv corrosion. Hmoov nrog kev tswj oxide morphology, xws li cov duab kheej kheej nrog qhov tsawg kawg nkaus oxidation, txhawb kev khiav zoo thiab fusion thaum lub sij hawm laser cladding.
Influence ntawm Microstructural yam ntxwv
Lub microstructure ntawm laser-clad hlau nthuav tawm cov yam ntxwv tshwj xeeb cuam tshuam los ntawm cov yam ntxwv ntawm cov hmoov:
Grain Size thiab Morphology: Cov hmoov hmoov zoo feem ntau ua rau cov qauv zoo dua vim muaj cov khoom sib zog sai. Qhov loj me me no feem ntau cuam tshuam nrog cov khoom siv kho kom zoo dua qub, xws li hardness dua thiab lub zog. Coarser hmoov, ntawm qhov tod tes, tuaj yeem ua rau cov qauv dendritic loj dua thiab txo cov khoom siv kho tshuab.
Phase Composition: Alloying ntsiab tam sim no nyob rau hauv cov hmoov yuav hloov cov theem kev cai ntawm lub clad txheej. Piv txwv li, qhov sib ntxiv ntawm tungsten carbide hais rau cov hmoov hlau tuaj yeem ua rau tsim cov khoom siv ntxiv, txhim kho kev hnav tsis kam.
Porosity thiab Inclusions: Cov yam ntxwv hmoov xws li cov ntsiab lus oxide thiab cov dej ntws ncaj qha cuam tshuam qhov tshwm sim ntawm porosity thiab kev suav nrog hauv txheej txheej. Cov hmoov zoo nrog cov ntsiab lus tsis tshua muaj oxide thiab cov khoom ntws zoo txo qis cov kev tsis zoo no, txhim kho kev ncaj ncees thiab kev ua tau zoo ntawm cov ntaub nplaum.
Case Studies thiab Experimental Data
Cov kev tshawb fawb sim muab cov kev nkag siab zoo rau kev sib raug zoo ntawm cov yam ntxwv ntawm cov hmoov thiab microstructure hauv laser cladding:
Kev tshawb fawb los ntawm Yang et al. (2020) pom tau hais tias siv cov hmoov zoo titanium ua rau muaj qhov sib xws ntawm microstructure nrog qhov txo qis hauv porosity piv rau cov hmoov coarser.
Hauv kev tshawb fawb los ntawm Zhang thiab Li (2019), nws tau pom tias nce cov ntsiab lus chromium hauv cov hmoov nplej ua rau tsim cov chromium-nplua nuj carbides thaum lub sij hawm laser cladding, txhim kho ob qho tib si hardness thiab hnav tsis kam ntawm txheej clad.
Xaus
Lub microstructure ntawm laser-clad hlau yog intricately txuas rau cov yam ntxwv ntawm cov hmoov feedstock siv nyob rau hauv tus txheej txheem. Hmoov particle loj, tshuaj muaj pes tsawg leeg, flowability, thiab oxide cov ntsiab lus tag nrho ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab qhov kawg microstructural nta xws li grain loj, theem muaj pes tsawg leeg, thiab tsis xws luag tsim nyob rau hauv lub clad txheej. Kev nkag siab thiab ua kom zoo dua cov yam ntxwv ntawm cov hmoov no yog qhov tseem ceeb rau kev ua tiav cov khoom xav tau thiab kev ua haujlwm ntawm laser-clad Cheebtsam hauv ntau daim ntawv thov kev lag luam.
Hauv kev xaus, kev tshawb fawb tsis tu ncua thiab kev txhim kho hauv cov hmoov thev naus laus zis txuas ntxiv txhim kho lub peev xwm ntawm laser cladding, muab cov kev daws teeb meem zoo rau kev txhim kho cov khoom nto thiab txuas ntxiv lub neej kev pab cuam ntawm cov khoom siv hluav taws xob.
Los ntawm kev siv cov ntaub ntawv-tsav kev nkag siab thiab kev txawj ntse, cov tuam txhab tuaj yeem ua kom zoo dua cov hmoov xaiv kom ua tiav kev tswj hwm ntawm microstructural evolution nyob rau hauv laser-clad hlau, yog li ua tau raws li qhov yuav tsum tau ua haujlwm nruj hauv kev siv niaj hnub no.
Xi'an Guosheng Laser Technology Co., Ltd. yog ib lub tuam txhab high-tech tshwj xeeb hauv R & D, tsim thiab muag ntawm cov tshuab laser tsis siv neeg cladding, high-speed laser cladding tshuab, laser quenching tshuab, laser vuam tshuab thiab laser 3D tshuab luam ntawv. Peb cov khoom raug nqi zoo thiab muag hauv tsev thiab txawv teb chaws. Yog tias koj txaus siab rau peb cov khoom, thov hu rau peb ntawm bob@gshenglaser.com.