Uma kuhlanganiswa insimbi ne-aluminium, ukusabela phakathi kwama-athomu e-Fe ne-Al ngesikhathi senqubo yokuxhuma kwakha ama-compounds e-brittle intermetallic (IMCs). Ukuba khona kwala ma-IMC kunciphisa amandla okuxhumana, ngakho-ke kubalulekile ukulawula inani lala ma-compounds. Isizathu sokwakheka kwama-IMC ukuthi ukuncibilika kwe-Fe ku-Al kubi. Uma kudlula inani elithile, kungathinta izakhiwo zomshini ze-weld. Ama-IMC anezakhiwo ezihlukile njengobulukhuni, ukuqina okulinganiselwe kanye nokuqina, kanye nezici ze-morphological. Ucwaningo luthole ukuthi uma kuqhathaniswa namanye ama-IMC, ungqimba lwe-Fe2Al5 IMC lubhekwa kabanzi njengoluqine kakhulu (11.8).± 1.8 GPa) IMC phase, futhi iyimbangela eyinhloko yokwehla kwezakhiwo zemishini ngenxa yokwehluleka kokushisela. Leli phepha liphenya inqubo yokushisela ye-laser ekude yensimbi ye-IF kanye ne-aluminium engu-1050 kusetshenziswa i-laser yemodi yendandatho elungisekayo, futhi liphenya ngokujulile ithonya lesimo se-laser beam ekwakhekeni kwama-intermetallic compounds kanye nezakhiwo zemishini. Ngokulungisa isilinganiso samandla e-core/ring, kutholakale ukuthi ngaphansi kwemodi yokuqhuba, isilinganiso samandla e-core/ring esingu-0.2 singafeza indawo engcono yokubopha i-weld interface futhi sinciphise kakhulu ukujiya kwe-Fe2Al5 IMC, ngaleyo ndlela sithuthukise amandla okusika kwejoyinti.
Lesi sihloko sethula ithonya le-laser yemodi yendandatho elungisekayo ekwakhekeni kwama-compounds e-intermetallic kanye nezakhiwo zemishini ngesikhathi sokushisela i-remote laser yensimbi ye-IF kanye ne-aluminium engu-1050. Imiphumela yocwaningo ikhombisa ukuthi ngaphansi kwemodi yokuqhuba, isilinganiso samandla e-core/ring esingu-0.2 sinikeza indawo enkulu yokubopha i-weld interface, eboniswa amandla aphezulu okugunda angu-97.6 N/mm2 (ukusebenza kahle kokuhlangana okungu-71%). Ngaphezu kwalokho, uma kuqhathaniswa nemishayo ye-Gaussian enesilinganiso samandla esingaphezu kuka-1, lokhu kunciphisa kakhulu ukujiya kwe-Fe2Al5 intermetallic compound (IMC) ngo-62% kanye nobukhulu be-IMC obuphelele ngo-40%. Kumodi yokubhoboza, kwabonakala imifantu kanye namandla aphansi okugunda uma kuqhathaniswa nemodi yokuqhuba. Kuyafaneleka ukuqaphela ukuthi ukucwengwa okubalulekile kokusanhlamvu kwabonwa kumthungo we-weld lapho isilinganiso samandla e-core/ring sasingu-0.5.
Uma u-r=0, kukhiqizwa amandla e-loop kuphela, kanti uma u-r=1, kukhiqizwa amandla ayinhloko kuphela.
Umdwebo weskimu wesilinganiso samandla r phakathi komsebe weGaussian nomsebe we-annular
(a) Idivayisi yokushisela; (b) Ukujula nobubanzi bephrofayili yokushisela; (c) Umdwebo weskimu wokubonisa izilungiselelo zesampula kanye nezinsimbi
Ukuhlolwa kwe-MC: Kuphela uma kwenzeka ugongolo lwe-Gaussian, umthungo wokushisela uqala ngemodi yokuqhuba engajulile (ID 1 no-2), bese ushintshela kwimodi yokukhiya engena kancane (ID 3-5), lapho kuvela imifantu esobala. Lapho amandla endandatho enyuka kusuka ku-0 kuya ku-1000 W, kwakungekho mifantu esobala ku-ID 7 futhi ukujula kokunotha kwensimbi kwakuncane kakhulu. Lapho amandla endandatho enyuka afinyelela ku-2000 kanye no-2500 W (IDs 9 no-10), ukujula kwendawo yensimbi ecebile kuyanda. Ukuqhekeka ngokweqile ngamandla endandatho angu-2500w (ID 10).
Ukuhlolwa kwe-MR: Uma amandla angaphakathi ephakathi kuka-500 no-1000 W (ID 11 no-12), umthungo wokushisela usemodi yokuqhuba; Uma kuqhathaniswa i-ID 12 ne-ID 7, yize amandla aphelele (6000w) efana, i-ID 7 isebenzisa imodi yomgodi wokukhiya. Lokhu kungenxa yokwehla okukhulu kobuningi bamandla ku-ID 12 ngenxa yesici se-loop esiyinhloko (r=0.2). Lapho amandla aphelele efika ku-7500 W (ID 15), imodi yokungena egcwele ingafinyelelwa, futhi uma kuqhathaniswa ne-6000 W esetshenziswe ku-ID 7, amandla emodi yokungena egcwele anda kakhulu.
Ukuhlolwa kwe-IC: Imodi eyenziwe (ID 16 no-17) ifinyelelwe ngamandla angu-1500w core kanye namandla endandatho angu-3000w kanye no-3500w. Uma amandla angu-3000w kanye namandla endandatho ephakathi kuka-1500w no-2500w (ID 19-20), kuvela imifantu esobala endaweni ehlangana nensimbi ecebile ne-aluminium ecebile, okwenza iphethini encane engenela endaweni. Uma amandla endandatho engama-3000 kanye no-3500w (ID 21 kanye no-22), finyelela imodi ye-keyhole egcwele.
Izithombe ezimele ezihlukanisayo zokuhlonza ngakunye kokushisela ngaphansi kwe-microscope ebonakalayo
Umfanekiso 4. (a) Ubudlelwano phakathi kwamandla okudonsa aphezulu (i-UTS) kanye nesilinganiso samandla ekuhlolweni kokushisela; (b) Amandla aphelele azo zonke izivivinyo zokushisela
Isithombe 5. (a) Ubudlelwano phakathi kwesilinganiso sesici kanye ne-UTS; (b) Ubudlelwano phakathi kokunwetshwa kanye nokujula kokungena kanye ne-UTS; (c) Ubuningi bamandla kuzo zonke izivivinyo zokushisela
Isithombe 6. (ac) Imephu ye-contour ye-indentation ye-Vickers microhardness; (df) Ama-spectra amakhemikhali e-SEM-EDS ahambisanayo okushisela imodi yokuqhuba; (g) Umdwebo we-schematic we-interface phakathi kwensimbi ne-aluminium; (h) I-Fe2Al5 kanye nobukhulu obuphelele be-IMC be-welds yemodi yokuqhuba
Isithombe 7. (ac) Imephu ye-contour ye-indentation ye-Vickers microhardness; (df) I-SEM-EDS chemical spectrum ehambisanayo yokushisela imodi yokubhoboza kwendawo emele ukungena kwendawo
Isithombe 8. (ac) Imephu ye-contour ye-indentation ye-Vickers microhardness; (df) I-SEM-EDS chemical spectrum ehambisanayo yokushisela imodi yokubhoboza okugcwele okumele
Isithombe 9. Isakhiwo se-EBSD sibonisa usayizi wezinhlamvu zesifunda esicebile ngensimbi (ipuleti eliphezulu) esivivinyweni semodi yokubhoboza okugcwele, futhi silinganisa ukusatshalaliswa kosayizi wezinhlamvu.
Isithombe 10. I-SEM-EDS spectra yokuxhumana phakathi kwensimbi ecebile ne-aluminium ecebile
Lolu cwaningo luhlole imiphumela ye-laser ye-ARM ekwakhekeni, isakhiwo esincane, kanye nezakhiwo zemishini ze-IMC kumajoyinti e-aluminium alloy e-IF steel-1050 angafani. Ucwaningo lucabangele izindlela ezintathu zokushisela (imodi yokuqhuba, imodi yokungena yendawo, kanye nemodi yokungena egcwele) kanye nezimo ezintathu ze-laser beam ezikhethiwe (ugongolo lwe-Gaussian, ugongolo lwe-annular, kanye nogongolo lwe-annular lwe-Gaussian). Imiphumela yocwaningo ikhombisa ukuthi ukukhetha isilinganiso samandla esifanele sogongolo lwe-Gaussian kanye nogongolo lwe-annular kuyipharamitha eyinhloko yokulawula ukwakheka kanye nesakhiwo se-microstructure se-carbon yangaphakathi, ngaleyo ndlela kukhuliswe izakhiwo zemishini ze-weld. Kumodi yokuqhuba, ugongolo oluyindilinga olunesilinganiso samandla esingu-0.2 lunikeza amandla amahle kakhulu okushisela (ukusebenza kahle kwejoyinti elingu-71%). Kumodi yokubhoboza, ugongolo lwe-Gaussian lukhiqiza ukujula okukhulu kokushisela kanye nesilinganiso sesici esiphezulu, kodwa ukuqina kokushisela kuncishiswa kakhulu. Ugongolo lwe-annular olunesilinganiso samandla esingu-0.5 lunomthelela omkhulu ekucwengisisweni kwezinhlayiya zensimbi eziseceleni komthungo wokushisela. Lokhu kungenxa yokushisa okuphezulu kwe-peak beam okuholela esilinganisweni sokupholisa esisheshayo, kanye nomphumela wokuvinjelwa kokukhula kokufuduka kwe-Al solute kuya engxenyeni engenhla yomthungo we-weld esakhiweni sezinhlamvu. Kukhona ukuhlobana okuqinile phakathi kokuqina kwe-Vickers kanye nokubikezela kwe-Thermo Calc kwephesenti levolumu yesigaba. Uma iphesenti levolumu le-Fe4Al13 likhulu, kulapho ukuqina kwe-micro kuphakeme khona.
Isikhathi sokuthunyelwe: Jan-25-2024
