Kev khav theebsiab tshaj melting thiab boiling ntsiab lusntawm tag nrho cov ntsiab lus paub,tungstentau dhau los ua qhov kev xaiv nrov rau cov ntawv thov uas muaj qhov kub thiab txias, suav nroglub teeb filaments, arc vuam, hluav taws xob tiv thaivthiab, tsis ntev los no, raws liplasma-ntsej muag khoomnyob rau hauv fusion reactors xws li ITER Tokamak.

Txawm li cas los xij,tungsten lub hauv paus brittleness, thiab microcracking uas tshwm sim thaum additively manufacturing (3-D luam ntawv) nrog covtsis tshua muaj hlau, tau cuam tshuam nws txoj kev saws me nyuam thoob plaws.

Yuav ua li cas thiab yog vim li cas cov microcracks daim ntawv no, Lawrence Livermore National Laboratory (LLNL) cov kws tshawb fawb tau ua ke thermomechanical simulations nrog high-ceev yeeb yaj duab coj thaum lub sij hawm laser hmoov-txaj fusion (LPBF) hlau 3-D luam ntawv txheej txheem. Thaum cov kev tshawb fawb yav dhau los tau txwv rau kev tshuaj xyuas cov kab nrib pleb tom qab tsim, cov kws tshawb fawb thawj zaug tuaj yeem pom qhov kev hloov pauv ntawm ductile-to-brittle (DBT) hauv tungsten hauv lub sijhawm tiag tiag, tso cai rau lawv saib seb microcracks pib li cas thiab kis tau zoo li cov hlau. cua sov thiab txias. Pab neeg no tuaj yeem txheeb xyuas qhov tshwm sim ntawm microcracking nrog cov kev hloov pauv xws li cov kev ntxhov siab seem, tus nqi thiab qhov kub thiab txias, thiab paub meej tias DBT ua rau tawg.

Cov kws tshawb fawb tau hais tias txoj kev tshawb no, tsis ntev los no tau tshaj tawm hauv phau ntawv xov xwm Acta Materialia thiab nthuav tawm hauv lub Cuaj Hlis qhov teeb meem ntawm MRS Bulletin muaj koob npe, nthuav tawm cov txheej txheem tseem ceeb tom qab tawg hauv.3-D-printed tungstenthiab teeb tsa lub hauv paus rau kev siv zog yav tom ntej los tsim cov khoom tawg-dawb ntawm cov hlau.

“Vim nws cov khoom tshwj xeeb,tungstentau ua lub luag haujlwm tseem ceeb hauv daim ntawv thov lub luag haujlwm tshwj xeeb rau Lub Tsev Haujlwm Saib Xyuas Lub Zog thiab Lub Tsev Haujlwm Saib Xyuas Kev Tiv Thaiv, "tus kws tshawb fawb tus thawj coj Manyalibo "Ibo" Matthews tau hais. "Qhov kev ua haujlwm no pab taug txoj hauv kev mus rau qhov chaw tsim khoom tshiab ntxiv rautungstenuas tuaj yeem cuam tshuam loj rau cov haujlwm no. "

Los ntawm lawv cov kev soj ntsuam kev soj ntsuam thiab cov qauv kev suav ua tau siv LLNL's Diablo finite element code, cov kws tshawb fawb pom tias microcracking hauv tungsten tshwm sim hauv lub qhov rais me me ntawm 450 thiab 650 degrees Kelvin thiab yog nyob ntawm tus nqi strain, uas yog cuam tshuam ncaj qha los ntawm cov txheej txheem tsis. Lawv kuj muaj peev xwm txheeb xyuas qhov luaj li cas ntawm thaj chaw tawg thiab tawg network morphology rau cov kev ntxhov siab hauv zos.

Lawrence Fellow Bey Vrancken, tus thawj coj ntawm cov ntawv sau thiab tus thawj coj tshawb nrhiav, tsim thiab ua qhov kev sim thiab tseem ua feem ntau ntawm cov ntaub ntawv tshuaj xyuas.

Vrancken tau hais tias "Kuv tau xav tias yuav muaj kev ncua sijhawm ntawm kev tawg rau tungsten, tab sis cov txiaj ntsig tau dhau qhov kuv xav tau," Vrancken tau hais. "Tus qauv thermomechanical tau piav qhia rau tag nrho peb cov kev soj ntsuam kev soj ntsuam, thiab ob qho tib si tau nthuav dav txaus los ntes tus nqi sib txawv ntawm DBT. Nrog rau txoj kev no, peb muaj cov cuab yeej zoo los txiav txim siab cov tswv yim zoo tshaj plaws los tshem tawm kev tawg thaum LPBF ntawm tungsten. "

Cov kws tshawb fawb tau hais tias kev ua haujlwm muab cov ncauj lus kom ntxaws, qhov tseem ceeb ntawm kev nkag siab ntawm cov txheej txheem ntawm cov txheej txheem thiab yaj geometry ntawm kev tawg thiab qhia txog cov khoom siv sib xyaw ua ke thiab preheating muaj nyob rau ntawm cov qauv kev ncaj ncees ntawm cov khoom luam tawm nrog tungsten. Pab pawg tau xaus lus tias ntxiv qee cov ntsiab lus hlau tuaj yeem pab txo qhov kev hloov pauv DBT thiab ntxiv dag zog rau cov hlau, thaum preheating tuaj yeem pab txo qis microcracking.

Pab neeg no yog siv cov txiaj ntsig los ntsuas cov txheej txheem kev sib tsoo uas twb muaj lawm, xws li cov txheej txheem thiab kev hloov pauv alloy. Cov kev tshawb pom, nrog rau cov kev kuaj mob uas tsim los rau txoj kev tshawb no, yuav yog qhov tseem ceeb rau lub Laboratory lub hom phiaj kawg ntawm 3-D luam ntawv tawg-dawb tungsten qhov chaw uas tuaj yeem tiv taus qhov chaw huab cua, cov kws tshawb fawb tau hais.