Kudzitamandiramalo osungunuka kwambiri komanso otentha kwambirizinthu zonse zodziwika bwino,tungstenchakhala chisankho chodziwika bwino pamapulogalamu okhudzana ndi kutentha kwambiri, kuphatikizamagetsi a magetsi, kuwotcherera arc, chitetezo cha radiationndipo, posachedwa, mongazinthu zoyang'ana plasmamu ma fusion reactors monga ITER Tokamak.

Komabe,brittleness yobadwa ya tungsten, ndi microcracking yomwe imachitika popanga zowonjezera (3-D kusindikiza) ndichitsulo chosowa, yalepheretsa kukhazikitsidwa kwake kofala.

Kuti adziwe momwe ma microcracks awa amapangidwira komanso chifukwa chake, asayansi a Lawrence Livermore National Laboratory (LLNL) aphatikiza zoyerekeza za thermomechanical ndi makanema othamanga kwambiri omwe amatengedwa panthawi yosindikiza zitsulo za 3-D laser powder-bed fusion (LPBF). Ngakhale kuti kafukufuku wam'mbuyomu anali wocheperako pakuwunika ming'alu pambuyo pomanga, asayansi kwa nthawi yoyamba adatha kuwona kusintha kwa ductile-to-brittle transition (DBT) mu tungsten munthawi yeniyeni, kuwalola kuwona momwe ma microcracks adayambira ndikufalikira ngati chitsulo. kutenthedwa ndi kuzizira. Gululo linatha kugwirizanitsa zochitika za microcracking ndi zosinthika monga kupsinjika kotsalira, kuthamanga kwa mpweya ndi kutentha, ndikutsimikizira kuti DBT inayambitsa kusweka.

Ofufuzawo ati kafukufukuyu, yemwe adasindikizidwa posachedwa mu nyuzipepala ya Acta Materialia ndipo adapezeka mu Seputembala ya MRS Bulletin yotchuka, akuwonetsa njira zomwe zidayambitsa kusokoneza.3-D-yosindikizidwa tungstenndikukhazikitsa maziko a ntchito zamtsogolo zopanga zida zopanda ming'alu kuchokera kuzitsulo.

"Chifukwa cha mawonekedwe ake apadera,tungstenwachitapo kanthu pazantchito zapadera za dipatimenti yoona za mphamvu ndi chitetezo ku dipatimenti yoona za mphamvu ndi chitetezo,” adatero wofufuza wina wamkulu Mansalibo “Ibo” Matthews. "Ntchitoyi ikuthandizira kupititsa patsogolo gawo latsopano lopangira zinthu zowonjezeratungstenzomwe zingakhudze kwambiri mautumikiwa. "

Kupyolera mu kuwunika kwawo koyeserera komanso kufananiza koyerekeza komwe kunachitika pogwiritsa ntchito LLNL's Diablo finite element, ofufuzawo adapeza kuti microcracking mu tungsten imachitika pawindo laling'ono pakati pa 450 ndi 650 madigiri Kelvin ndipo amadalira kuchuluka kwa zovuta, zomwe zimakhudzidwa mwachindunji ndi magawo azinthu. Anathanso kugwirizanitsa kukula kwa malo omwe akhudzidwa ndi crack ndi crack network morphology ndi kupsinjika kotsalira komweko.

Lawrence Fellow Bey Vrancken, wolemba wamkulu wa pepalali komanso wofufuza mnzake wamkulu, adapanga ndikuchita zoyesererazo komanso adasanthula zambiri.

"Ndinali kuganiza kuti pakhala kuchedwa kung'ambika kwa tungsten, koma zotsatira zake zidaposa zomwe ndimayembekezera," adatero Vrancken. "Mtundu wa thermomechanical udapereka kufotokozera kwazomwe tawonera, ndipo zonse zidali zatsatanetsatane zokwanira kutengera kudalira kwa DBT. Ndi njira iyi, tili ndi chida chabwino kwambiri chodziwira njira zothandiza kwambiri zochotsera ming'alu pa LPBF ya tungsten. "

Ofufuzawo ati ntchitoyi ikupereka mwatsatanetsatane, kumvetsetsa kofunikira pakukhudzidwa kwa magawo azinthu komanso kusungunula ma geometry pakupanga ming'alu ndikuwonetsa momwe zinthu zimakhudzira kapangidwe kake ndi kutentha koyambilira kumakhudza kukhulupirika kwa magawo omwe amasindikizidwa ndi tungsten. Gululo linanena kuti kuwonjezera zinthu zina za alloy kungathandize kuchepetsa kusintha kwa DBT ndi kulimbikitsa zitsulo, pamene kutentha kusanayambe kungathandize kuchepetsa microcracking.

Gululi likugwiritsa ntchito zotsatira kuti liwunikire njira zomwe zilipo kale zochepetsera ming'alu, monga kusintha kwa ndondomeko ndi alloy. Zomwe zapeza, pamodzi ndi zowunikira zomwe zapangidwira kafukufukuyu, zidzakhala zofunika kwambiri ku cholinga chachikulu cha Laboratory cha 3-D kusindikiza magawo a tungsten opanda ming'alu omwe amatha kupirira malo ovuta kwambiri, ofufuza adatero.