Al-Mg-Er-Zr alloys, tus cwj pwm los ntawm lawv lub zog zoo tshaj thiab thermal stability, sawv cev rau cov neeg sib tw cov ntaub ntawv muaj txiaj ntsig zoo rau kev lag luam shipbuilding. Txawm li cas los xij, thaum siv high-txoj kev ua haujlwm laser vuam los koom nrog cov khoom siv no, tsis siv Al₃(Er,Zr) ntxiv dag zog rau cov khoom zoo li sib cais hauv cov vuam seam; concurrently, discontinuous cheeb tsam ntawm nplua equiaxed nplej thiab columnar nplej daim ntawv, uas ua rau ib tug txo nyob rau hauv kev sib koom ua ke lub zog. Txhawm rau hais txog qhov teeb meem ntawm kev sib cais los nag thiab ua tiav qhov sib npaug ntawm qhov sib txuas microstructure, qhov kev tshawb fawb no siv cov txheej txheem laser vuam uas muaj qhov sib txawv ntawm qhov scanning, kho cov kab teeb tsa ntawm qhov chaw. Qhov kev ua nplawm nyob rau hauv lub pas dej molten displaces lub unfused Al₃ (Er, Zr) hais los ntawm fusion kab mus rau qhov chaw weld, thaum lub sij hawm ib tug ntau uniform kub faib ib txhij inhibits columnar grain loj hlob. Thaum kawg, kev faib tawm tsis sib xws ntawm Al₃ (Er, Zr) cov khoom, ua haujlwm sib koom ua ke nrog kev ua kom qis qis hauv lub pas dej molten, ua kom zoo dua cov microstructure. Qhov tshwm sim welded pob qij txha muaj cov khoom siv zoo heev, ua tiav lub zog tensile ntawm 389 ± 1 MPa- sib npaug rau 93.3% ntawm lub hauv paus hlau lub zog.
Cov ntsiab lus tseem ceeb: Los ntawm kev siv transverse-scanning annular-spot laser vuam tshuab, txoj kev tshawb no tau ua tiav cov kev cai sib koom ua ke ntawm ob qho tib si microstructure thiab mechanical zog ntawm Al-6Mg-0.1Er-0.1Zr pob qij txha. Lub ntsiab lus xaus yog raws li nram no: (1) Nyob rau hauv cov pa laser welding, kev sib cais ntawm unfused Al₃ (Er, Zr) hais nyob rau hauv lub low-temperature laminar flow zone-ua raws li heterogeneous nucleation sites-ua rau tsim ib tug nplua equiaxed grain cheeb tsam nyob rau hauv lub weld seam; conversely, qhov tsis muaj xws li hais nyob rau hauv nruab nrab ntawm lub weld tshwm sim nyob rau hauv tsim ntawm ib coarse columnar grain qauv.
(2) Los ntawm daim ntawv thov ntawm scanning annular laser chaw technology, ib tug uniform faib ntawm Al₃ (Er, Zr) hais nyob rau hauv lub weld hlau tau tiav. Lub zog txav ntawm lub qhov tseem ceeb txhawb nqa lub pas dej ua ke, yog li tshem tawm cov khoom sib cais mus rau qhov chaw ntawm qhov vuam. Kev sib xyaw ua ke ntawm cov khoom sib xyaw ua ke thiab qhov nthuav dav hauv cheeb tsam sib sau ua ke tau yooj yim rau kev ua kom zoo dua ntawm cov hlau weld rau hauv cov qauv ntawm cov nplej tag nrho equiaxed. (3) Tau txais txiaj ntsig los ntawm cov txiaj ntsig ntawm kev nplua - cov qoob loo ntxiv dag zog thiab nag lossis daus, qhov pom kev sib koom ua ke tau nthuav tawm cov khoom siv zoo heev, ua tiav lub zog tensile ntawm 389 ± 1 MPa- sib npaug rau 93.3% ntawm lub hauv paus hlau lub zog.
