Laser cladding yog ib lub tshuab uas siv lub zog siab laser beam raws li qhov chaw tshav kub kom yaj thiab solidify cov ntaub ntawv muab tub lim coated rau ntawm lub substrate, tsim ib tug metallurgical daim ntawv cog lus ntawm ob, thiab ces txhim kho nws nto khoom. Piv nrog rau lwm cov thev naus laus zis ntxiv dag zog rau saum npoo, laser cladding muaj ntau qhov zoo xws li ceev ceev txias, yooj yim metallurgical bonding ntawm txheej thiab substrate, me me tshav kub-cuam tshuam cheeb tsam, tsawg dilution tus nqi, me me deformation ntawm substrate, yooj yim automation, thiab tsis muaj kuab paug. Yog li ntawd, thev naus laus zis tau siv dav dav hauv aerospace, mining machinery, petrochemical, tsheb, nkoj, hluav taws xob, tsheb ciav hlau thiab lwm yam lag luam.
Txawm li cas los xij, laser cladding yog cov cua kub ceev thiab cua txias. Qhov kub thiab txias ntawm lub substrate thiab cladding txheej, qhov tsis sib npaug ntawm cov theem nyuaj nyob rau hauv lub cladding txheej thiab qhov sib txawv ntawm lub cev ntawm lub cladding txheej thiab cov khoom siv matrix yuav muaj qee yam cuam tshuam rau qhov ruaj khov thiab cov khoom siv ntawm cov txheej txheem cladding. , uas yuav ua rau kev pib thiab nthuav tawm ntawm cov kab nrib pleb. Kev tsim cov kab nrib pleb hauv cladding txheej muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm lub neej, uas yog ib qho teeb meem ceev uas yuav tsum tau daws nyob rau hauv kev lag luam daim ntawv thov ntawm laser cladding technology.
Laser cladding yog txheej txheem ntawm cua kub ceev thiab txias thiab complex metallurgical cov tshuaj tiv thaiv. Tam sim no, kev tshawb fawb txog kev tawg ntawm cladding txheej tsuas yog tsom rau ib qho kev tswj hwm ib leeg, thiab tsis muaj kev tshawb fawb txog kev ua haujlwm. Hauv txoj kev tshawb no, Ni60 alloy cladding txheej tau npaj rau ntawm 42CrMo steel nto los ntawm pre-ntev hmoov laser cladding tshuab. Ua ntej, cov txheej txheem tawg thiab tawg rhiab heev raug tshuaj xyuas, thiab tom qab ntawd cov kev cuam tshuam ntawm lub zog sib txawv ntawm lub zog laser thiab qhov kub thiab txias ntawm qhov tawg tau kawm, txhawm rau muab kev siv rau kev tswj cov tawg ntawm laser cladding Ni-based alloy.
Cov ntaub ntawv xeem thiab cov txheej txheem
1. Cov khoom siv kuaj
Hauv qhov kev sim no, 42CrMo alloy hlau raug xaiv los ua cov khoom siv matrix hauv laser cladding xeem, thiab cov phaj puag ncig yog Φ150 hli × 10 hli. Xuab zeb 42CrMo steel nto nrog cov ntawv xuab zeb ua ntej laser cladding, thiab ntxuav nws nrog cawv thiab acetone los xyuas kom meej tias tsis muaj lwm yam impurities ntawm lub substrate. Cov hmoov cladding tau xaiv nrog Ni60 alloy, thiab qhov loj me yog 53 ~ 150 μm. Cov tshuaj muaj pes tsawg leeg ntawm Ni60 alloy tau pom nyob rau hauv Table 1.
Table 1 Tshuaj muaj pes tsawg leeg ntawm Ni60 alloy %
|
m(C) |
m(Si) |
m(Cr) |
m(Ni) |
m(Mo) |
m(Fe) |
m(B) |
|
=0.70 |
=4.50 |
= 17.0 |
=60.0 |
= 3.0 |
=5.0 |
=2.70 |
2. Cov kev sim
LWS-1000 Nd: YAG laser raug xaiv rau laser cladding los ntawm prelaying hmoov thiab multi-lap process. Cov qauv kev npaj tsis muaj raws li hauv qab no: laser zog 270 ~ 300 W, scanning ceev 300 mm / min, preheating kub 170 ~ 270 degree, lap rate 50%. Tom qab laser cladding xeem, Zeiss Stemi305 stereoscope tau siv los soj ntsuam qhov chaw morphology ntawm cladding txheej. Cov txheej txheej npaj cladding raug txiav rau hauv cov qauv loj ntawm 5 hli × 10 hli × 10 hli, thiab tom qab ntawd HCl + HNO3 tov nrog lub ntim piv ntawm 3 ∶ 1 yog siv los corrode polished cladding txheej hla ntu. Jiangnan MR5000 metallographic microscope thiab Regulus8230 scanning electron microscope tau siv los soj ntsuam lub microstructure ntawm Ni60 cladding txheej, thiab EDS tau siv los tshuaj xyuas cov khoom xa tawm nyob ze thiab tsis muaj kab nrib pleb hauv txheej cladding zoo thiab ntau. VTD401 digital microVickers hardness tester tau siv los ntsuas qhov microhardness ntawm ntu ntu ntawm cladding txheej. Lub loading load yog 50 g thiab lub sij hawm tuav yog 10 s. Cov theem tau soj ntsuam los ntawm D / MAX2500VL / PC rotating phiaj X-ray diffractometer.
Xaus
1. Lub microstructure ntawm txheej cladding yog tsim los ntawm - (Fe, Ni), Fe0.64Ni0.36 thiab M23C6. Cov kab nrib pleb hauv qhov kev sim no yog qhov pib los ntawm cov kab nrib pleb, uas feem ntau tshwm sim los ntawm txheej txheej cladding thiab txuas mus rau qhov sib txuas ntawm cov txheej cladding thiab matrix, thiab feem ntau ntawm cov kab nrib pleb ncaj qha mus rau tag nrho cov txheej txheej cladding. Qhov sib txawv ntawm thermal zog ntawm cov matrix thiab cladding txheej, qhov kub thiab txias gradient thiab kev sib cais ntawm cov theem nyuaj nyob rau hauv lub cladding txheej muaj qee qhov cuam tshuam rau qhov tawg rhiab heev.
2. Nrog rau qhov nce ntawm lub zog laser, qhov tawg tsis ua hauj lwm hauv txheej cladding yog pom tseeb txhim kho. Thaum lub hwj chim yog 290 W, tsuas muaj qee qhov tawg ntawm cov txheej cladding thiab cov khoom siv kho kom zoo yog khaws cia. Thaum lub hwj chim ntxiv, qhov dilution tus nqi ntawm cov cladding txheej yog loj heev, uas ua rau txo nws cov kev ua tau zoo.
3. Nrog rau qhov nce ntawm preheating kub, qhov tawg tsis ua hauj lwm nyob rau hauv lub cladding txheej yuav maj mam txo. Thaum lub preheating kub yog 270 degree, tsuas yog ib tug me me ntawm cov kab nrib pleb nyob rau hauv lub cladding txheej, tab sis high preheating kub yuav ua kom puas cov txheej txheem ntawm substrate thiab cladding txheej, yog li tsis muaj kub preheating yog nqa tawm.
Xi'an Guosheng Laser Technology Co., Ltd. yog ib lub tuam txhab high-tech tshwj xeeb hauv R & D, tsim thiab muag 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.