Kuzvitutumadzayakanyanya kunyungudika uye inofashaira nzvimboyezvinhu zvese zvinozivikanwa,tungstenyave sarudzo yakakurumbira yezvikumbiro zvinosanganisira tembiricha yakanyanyisa, kusanganisiramwenje wegirobhu filaments, arc welding, kudzivirira mwaranziuye, munguva pfupi yapfuura, seplasma-yakatarisana zvinhumune fusion reactor senge ITER Tokamak.

Zvisinei,tungsten's inherent brittleness, uye microcracking inoitika panguva yekuwedzera kugadzira (3-D kudhinda) pamwe nesimbi isingawanzo, yakanganisa kugamuchirwa kwayo kwakapararira.

Kuratidza kuti ma microcracks aya akaumbwa sei uye nei, Lawrence Livermore National Laboratory (LLNL) masayendisiti akabatanidza thermomechanical simulations nemavhidhiyo ekumhanya-mhanya akatorwa panguva yelaser powder-bed fusion (LPBF) metal 3-D kudhinda maitiro. Nepo tsvakiridzo yapfuura yaingogumira pakuongorora pakatsemuka mushure mekuvaka, masayendisiti kekutanga akakwanisa kuona ductile-to-brittle shanduko (DBT) mu tungsten munguva chaiyo, ichivabvumira kuona kuti ma microcracks akatanga uye kupararira sei sesimbi. kupisa uye kutonhodzwa. Chikwata chakakwanisa kubatanidza iyo microcracking phenomenon nemhando dzakasiyana senge yakasara kusagadzikana, strain rate uye tembiricha, uye kusimbisa iyo DBT yakakonzera kuputika.

Vatsvagiri vakati ongororo iyi, ichangobva kuburitswa mugwaro re Acta Materialia uye yakaburitswa munaGunyana chinyorwa chemukurumbira MRS Bulletin, inoburitsa nzira dzakakosha dzekupaza.3-D-yakadhindwa tungstenuye inoisa hwaro hwekuedza kweramangwana kugadzira zvikamu zvisina crack kubva musimbi.

“Nekuda kwehunhu hwayo hwakasiyana,tungstenyakaita basa rakakosha mukunyorerwa kwakanangana nemamishinari kuDhipatimendi reMagetsi neDhipatimendi reDziviriro,” akadaro mumwe mukuru anoferefeta Manyalibo “Ibo” Matthews. "Basa iri rinobatsira kuvhura nzira yekuenda kunzvimbo itsva yekuwedzera yekugadzira yekugadziratungstenizvo zvinogona kuita zvakakosha kumamishini aya."

Kuburikidza neongororo yavo yekuyedza uye computational modeling yakaitwa vachishandisa LLNL's Diablo finite element code, vaongorori vakawana kuti microcracking mu tungsten inoitika pahwindo diki pakati pe450 ne650 madhigirii Kelvin uye zvinoenderana nedhigirii redhisheni, iro rinokanganiswa zvakananga nemaitiro paramita. Ivo zvakare vakakwanisa kuwiriranisa saizi yenzvimbo yakakanganisika uye crack network morphology kune zvakasara zvinonetsa.

Lawrence Fellow Bey Vrancken, munyori anotungamira webepa uye co-principal muongorori, akagadzira uye akaita zviedzo uye akaitawo yakawanda yekuongorora data.

"Ndakanga ndafungidzira kuti pachave nekunonoka mukutsemuka kwetungsten, asi mhedzisiro yacho yakapfuura zvandaitarisira," akadaro Vrancken. "Iyo thermomechanical modhi yakapa tsananguro yezvese zvataongorora, uye ese ari maviri aive akadzama zvakakwana kuti atore kutsamira kwechiyero cheDBT. Neiyi nzira, isu tine chishandiso chakanakisa chekuona nzira dzinoshanda dzekubvisa kupaza panguva yeLPBF ye tungsten. "

Vatsvagiri vakati basa rinopa kwakadzama, kwakakosha kunzwisiswa kwesimba remagadzirirwo paramita uye inonyungudutsa geometry pakugadzira crack uye rinoratidza maitiro ekuumbwa kwezvinhu uye preheating zvine pakurongeka kwezvikamu zvakadhindwa ne tungsten. Chikwata chakagumisa kuti kuwedzera zvimwe alloy zvinhu zvinogona kubatsira kuderedza shanduko yeDBT uye kusimbisa simbi, nepo preheating inogona kubatsira kuderedza microcracking.

Chikwata chiri kushandisa zvabuda kuongorora nzira dziripo dzekupwanya, senge process uye alloy gadziriso. Zvakawanikwa, pamwe chete nekuongorora kwakagadziridzwa pachidzidzo ichi, kuchave kwakakosha kuchinangwa chekupedzisira cheLabhoritari ye3-D yekudhinda-isina tungsten zvikamu zvinokwanisa kumira nharaunda dzakanyanya, vaongorori vakadaro.