Lokacin haɗa karfe zuwa aluminium, halayen da ke tsakanin Fe da Al atom yayin tsarin haɗin suna haifar da gaggautsa mahaɗan intermetallic (IMCs). Kasancewar waɗannan IMCs yana iyakance ƙarfin injin haɗin gwiwa, don haka ya zama dole don sarrafa adadin waɗannan mahadi. Dalilin samuwar IMC shine cewa solubility na Fe a cikin Al ba shi da kyau. Idan ya zarce ƙayyadaddun adadin, yana iya shafar kayan aikin injin walda. IMCs suna da ƙayyadaddun kaddarorin kamar taurin, iyakancewar ductility da tauri, da fasalulluka. Bincike ya gano cewa idan aka kwatanta da sauran IMCs, ana ɗaukar Layer Fe2Al5 IMC a matsayin mafi gatsewa (11.8).± 1.8 GPa) lokaci na IMC, kuma shine babban dalilin raguwar kayan aikin injiniya saboda gazawar walda. Wannan takarda yana bincikar tsarin waldawar laser mai nisa na IF karfe da aluminum 1050 ta amfani da Laser yanayin zobe mai daidaitacce, kuma yayi bincike cikin zurfin tasirin tasirin katako na Laser akan samuwar mahaɗan intermetallic da kaddarorin injina. Ta hanyar daidaita ma'aunin wutar lantarki na core / zobe, an gano cewa a ƙarƙashin yanayin gudanarwa, madaidaicin ƙarfin / zobe na 0.2 na iya cimma mafi kyawun yanayin haɗin gwiwar walda kuma rage girman kauri na Fe2Al5 IMC, don haka inganta ƙarfin haɗin gwiwa. .
Wannan labarin yana gabatar da tasirin laser yanayin zobe mai daidaitacce akan samuwar mahaɗan intermetallic da kaddarorin injina yayin waldawar Laser mai nisa na IF karfe da aluminium 1050. Sakamakon binciken ya nuna cewa a ƙarƙashin yanayin gudanarwa, ma'auni / zobe ikon rabo na 0.2 yana ba da babban yanki mai haɗawa da walƙiya, wanda ke nunawa ta iyakar ƙarfin ƙarfi na 97.6 N/mm2 (haɗin haɗin gwiwa na 71%). Bugu da kari, idan aka kwatanta da Gaussian biams tare da ikon rabo fiye da 1, wannan muhimmanci rage kauri na Fe2Al5 intermetallic fili (IMC) da 62% da kuma jimlar IMC kauri da 40%. A cikin yanayin ɓarna, an lura da raguwa da ƙananan ƙarfin ƙarfi idan aka kwatanta da yanayin gudanarwa. Yana da mahimmanci a lura cewa an lura da gyaran ƙwayar hatsi mai mahimmanci a cikin kabu na weld lokacin da ma'aunin wutar lantarki / zobe ya kasance 0.5.
Lokacin da r=0, madauki kawai ake samar da wutar lantarki, yayin da lokacin da r=1, kawai ainihin ikon ke samarwa.
Tsarin tsari na rabon wutar lantarki r tsakanin Gaussian katako da katako na shekara
(a) Na'urar walda; (b) Zurfin da nisa na bayanan weld; (c) Zane-zane na nunin samfuri da saitunan daidaitawa
Gwajin MC: A cikin yanayin Gaussian katako ne kawai, saitin weld ɗin yana cikin yanayin gudanarwa mara zurfi (ID 1 da 2), sa'an nan kuma ya canza zuwa wani ɓangaren shiga yanayin kulle-kulle (ID 3-5), tare da bayyana fashe. Lokacin da ƙarfin zobe ya karu daga 0 zuwa 1000 W, babu wasu fashe-fashe a ID 7 kuma zurfin haɓakar ƙarfe ya kasance kaɗan. Lokacin da ƙarfin zobe ya karu zuwa 2000 da 2500 W (IDs 9 da 10), zurfin yankin ƙarfe mai arziki yana ƙaruwa. Tsanani mai yawa a ƙarfin zobe na 2500w (ID 10).
Gwajin MR: Lokacin da ainihin ƙarfin ke tsakanin 500 da 1000 W (ID 11 da 12), kabu na weld yana cikin yanayin gudanarwa; Kwatanta ID 12 da ID 7, kodayake jimlar ƙarfin (6000w) iri ɗaya ne, ID 7 yana aiwatar da yanayin rami na kulle. Wannan ya faru ne saboda gagarumin raguwar ƙarfin ƙarfi a ID 12 saboda babban madaidaicin madauki (r=0.2). Lokacin da jimlar ƙarfin ya kai 7500 W (ID 15), ana iya samun cikakken yanayin shigar ciki, kuma idan aka kwatanta da 6000 W da aka yi amfani da shi a cikin ID 7, ƙarfin cikakken yanayin shigar yana ƙaruwa sosai.
Gwajin IC: Yanayin da aka gudanar (ID 16 da 17) an cimma su a 1500w core power da 3000w da 3500w zobe. Lokacin da ainihin ƙarfin shine 3000w kuma ƙarfin zobe yana tsakanin 1500w da 2500w (ID 19-20), fashe fashe na bayyana a mahaɗin tsakanin ƙarfe mai ƙarfi da aluminium mai albarka, yana samar da ƙaramin ramuka na gida. Lokacin da ƙarfin zobe ya kasance 3000 da 3500w (ID 21 da 22), cimma cikakken yanayin shigar maɓalli.
Hotunan wakilan giciye-sashe na kowane ganewar walda a ƙarƙashin na'urar gani mai gani
Hoto 4. (a) Dangantakar da ke tsakanin ƙarfin ƙarfi na ƙarshe (UTS) da rabon iko a cikin gwaje-gwajen walda; (b) Jimlar ikon duk gwajin walda
Hoto 5. (a) Dangantaka tsakanin rabon al'amari da UTS; (b) Alakar da ke tsakanin tsawo da zurfin shiga da UTS; (c) Ƙarfin ƙarfi don duk gwaje-gwajen walda
Hoto 6. (ac) Vickers microhardness indentation contour map; (df) Daidaitaccen nau'in sinadarai na SEM-EDS don yanayin walƙiya na wakilci; (g) Tsarin tsari na mu'amala tsakanin karfe da aluminum; (h) Fe2Al5 da kuma jimlar IMC kauri na conductive yanayin welds
Hoto 7. (ac) Vickers microhardness indentation contour map; Df
Hoto 8. (ac) Vickers microhardness indentation contour map; Df
Hoto 9. Makircin EBSD yana nuna girman hatsi na yanki mai arzikin ƙarfe (faranti na sama) a cikin cikakken gwajin yanayin shigar ciki, kuma yana ƙididdige girman rabon hatsi.
Hoto 10. SEM-EDS spectra na tsaka-tsaki tsakanin ƙarfe mai arziki da aluminum mai arziki
Wannan binciken ya bincika tasirin Laser ARM akan samuwar, microstructure, da kaddarorin inji na IMC a cikin IF karfe-1050 aluminium alloy dissimilar cinya welded gidajen abinci. Binciken ya yi la'akari da yanayin walda guda uku (yanayin gudanarwa, yanayin shigar gida, da cikakken yanayin shigar ciki) da kuma zaɓaɓɓun sifofin katako na laser guda uku (Gaussian beam, annular biam, da Gaussian annular katako). Sakamakon binciken ya nuna cewa zaɓin madaidaicin ƙarfin wutar lantarki na Gaussian katako da katako na annular shine maɓalli mai mahimmanci don sarrafa samuwar da microstructure na modal carbon na ciki, ta haka yana haɓaka kayan aikin injin walda. A cikin yanayin gudanarwa, madauwari madauwari tare da rabon iko na 0.2 yana ba da mafi kyawun ƙarfin walda (71% haɓakar haɗin gwiwa). A cikin perforation yanayin, da Gaussian katako samar da mafi girma waldi zurfin da mafi girma al'amari rabo, amma waldi tsanani ne muhimmanci rage. Ƙaƙwalwar annular tare da rabon wutar lantarki na 0.5 yana da tasiri mai mahimmanci akan gyaran ƙwanƙwasa na gefen karfe a cikin shingen weld. Wannan ya faru ne saboda ƙananan zafin jiki na katako na annular wanda ke haifar da saurin sanyaya, da tasirin haɓakar haɓakar ƙaura na Al solute zuwa ɓangaren sama na kabu na walda akan tsarin hatsi. Akwai ƙaƙƙarfan alaƙa tsakanin Vickers microhardness da hasashen Thermo Calc na yawan ƙarar lokaci. Mafi girman girman girman Fe4Al13, mafi girman microhardness.
Lokacin aikawa: Janairu-25-2024
