Ukuqhayisa iiindawo eziphezulu zokunyibilika kunye nokubilisakuzo zonke izinto ezaziwayo,i-tungstenibe lukhetho oludumileyo lwezicelo ezibandakanya ubushushu obugqithisileyo, kubandakanyaimicu yesibane, welding arc, ukhuselo lwemithakwaye, kutshanje, njengokoizinto ezijongene neplasmakwi fusion reactors ezifana ITER Tokamak.

Nangona kunjalo,Ubunzima be-tungsten bendalo, kunye ne-microcracking eyenzekayo ngelixa ukongeza ukuveliswa (Ushicilelo lwe-3-D) neintsimbi enqabileyo, kuthintele ukwamkelwa kwayo ngokubanzi.

Ukubonakalisa indlela kwaye kutheni ezi zixhobo ze-microcracks zenza njani, i-Lawrence Livermore National Laboratory (LLNL) izazinzulu ziye zadibanisa ukulinganisa kwe-thermomechanical kunye neevidiyo ezikhawulezayo ezithathwe ngexesha le-laser powder-bed fusion (LPBF) inkqubo yokushicilela isinyithi se-3-D. Nangona uphando lwangaphambili lwalulinganiselwe ekuhloleni iintanda emva kokwakhiwa, izazinzulu okokuqala zazikwazi ukubona i-ductile-to-brittle transition (DBT) kwi-tungsten ngexesha lokwenyani, ebavumela ukuba bajonge indlela ii-microcracks eziqalwe ngayo kwaye zasasazeka njengesinyithi. ishushu kwaye ipholile. Iqela lakwazi ukulungelelanisa i-microcracking phenomenon kunye nezinto eziguquguqukayo ezifana noxinzelelo oluseleyo, izinga loxinzelelo kunye nokushisa, kwaye uqinisekise ukuba i-DBT ibangele ukuqhekeka.

Abaphandi bathi uphononongo, olupapashwe kutshanje kwijenali Acta Materialia kwaye luvezwe kushicilelo lukaSeptemba lwe-MRS Bulletin edumileyo, lutyhila iindlela ezisisiseko zokuqhekeka.I-tungsten ye-3-D eprintiweyokwaye ibeka isiseko kwiinzame zexesha elizayo zokuvelisa iinxalenye ezingenazintanda kwintsimbi.

"Ngenxa yeempawu zayo ezizodwa,i-tungstenidlale indima ebalulekileyo kwizicelo ezingqamene nobuthunywa kwiSebe lezaMandla kunye neSebe lezoKhuselo,” utshilo uManyalibo “Ibo” Matthews ongomnye womphandi oyintloko. “Lo msebenzi unceda ekuvuleni indlela eya kwindawo entsha yokwenziwa kwemvelisoi-tungstenezinokuthi zibe nefuthe elibonakalayo kule mishini. "

Ngokujonga kwabo kovavanyo kunye nemodeli yokubala eyenziwe kusetyenziswa ikhowudi yento ephelelisiweyo ye-Diablo ye-LLNL, abaphandi bafumanise ukuba i-microcracking kwi-tungsten yenzeke kwifestile encinci phakathi kwe-450 kunye ne-650 degrees Kelvin kwaye ixhomekeke kwisantya soxinzelelo, esichatshazelwa ngokuthe ngqo kwiiparamitha zenkqubo. Bakwakwazi ukunxulumanisa ubungakanani bendawo echatshazelwe kukuqhekeka kunye ne-crack network morphology kuxinzelelo olushiyekileyo lwendawo.

ULawrence Fellow Bey Vrancken, umbhali okhokelayo wephepha kunye nomphandi oyintloko, wayila waza wenza imifuniselo kwaye waqhuba uninzi lohlalutyo lwedatha.

“Ndandicingela ukuba kuzakubakho ukulibaziseka kokuqhekeka kwe-tungsten, kodwa iziphumo zigqithise kakhulu bendilindele,” utshilo uVrancken. "Imodeli ye-thermomechanical inike ingcaciso kulo lonke uqwalaselo lwethu lovavanyo, kwaye zombini zineenkcukacha ngokwaneleyo ukubamba ukuxhomekeka kwesantya soxinzelelo lwe-DBT. Ngale ndlela, sinesixhobo esibalaseleyo sokumisela ezona zicwangciso zisebenzayo zokuphelisa ukuqhekeka ngexesha le-LPBF ye-tungsten. ”

Abaphandi bathi umsebenzi ubonelela ngeenkcukacha, ukuqonda okusisiseko kwempembelelo yeeparameters zenkqubo kunye nejometri enyibilikayo ekubunjweni kokuqhekeka kwaye ubonisa impembelelo yokwakheka kwezinto kunye nokufudumeza kwangaphambi kokuba kugqibelele ukwakheka kweengxenye eziprintwe nge-tungsten. Iqela lagqiba ukuba ukongeza izinto ezithile ze-alloy kunokunceda ukunciphisa utshintsho lwe-DBT kunye nokuqinisa isinyithi, ngelixa ukufudumala kwangaphambili kunokuncedisa ukunciphisa i-microcracking.

Iqela lisebenzisa iziphumo ukuvavanya iindlela ezikhoyo zokunciphisa ukuqhekeka, njengenkqubo kunye nokuguqulwa kwe-alloy. Iziphumo, kunye noxilongo oluphuhliswe kuphononongo, luya kubaluleka kwinjongo yokugqibela yeLebhu ye-3-D yoshicilelo lwe-tungsten engena-crack-free parts enokumelana nokusingqongileyo okugqithisileyo, abaphandi bathi.