{"id":8388,"date":"2024-10-18T14:00:23","date_gmt":"2024-10-18T06:00:23","guid":{"rendered":"https:\/\/am-material.com\/?p=8388"},"modified":"2024-10-18T14:08:23","modified_gmt":"2024-10-18T06:08:23","slug":"effect-of-heat-treatment-on-microstructure-and-mechanical-properties-of-lpbf-cucrzr","status":"publish","type":"post","link":"https:\/\/am-material.com\/tr\/news\/effect-of-heat-treatment-on-microstructure-and-mechanical-properties-of-lpbf-cucrzr\/","title":{"rendered":"Is\u0131l i\u015flemin LPBF CuCrZr'nin mikroyap\u0131s\u0131 ve mekanik \u00f6zellikleri \u00fczerine etkisi"},"content":{"rendered":"
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CuCrZr (C18150) ala\u015f\u0131m\u0131 <\/strong>y\u00fcksek mekanik, termal ve elektriksel \u00f6zellikleri ile bilinen bir \u00e7\u00f6kelme sertle\u015fmeli ala\u015f\u0131md\u0131r. Ala\u015f\u0131m, \u0131s\u0131 e\u015fanj\u00f6r cihazlar\u0131nda ve n\u00fckleer f\u00fczyon alan\u0131nda yayg\u0131n olarak kullan\u0131lmaktad\u0131r.<\/p>

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CuCrZr ala\u015f\u0131m\u0131<\/strong> bir\u00e7ok uygulamada saf bak\u0131r\u0131n yerini alabilen, Cr i\u00e7eri\u011fi %0,5 a\u011f\u0131rl\u0131k ile %1,2 a\u011f\u0131rl\u0131k aras\u0131nda, Zr i\u00e7eri\u011fi %0,03 a\u011f\u0131rl\u0131k ile %0,3 a\u011f\u0131rl\u0131k aras\u0131nda olan \u00e7ok \u00e7ekici bir ala\u015f\u0131md\u0131r. Ve lazer bazl\u0131 eklemeli imalat teknolojisi ile saf bak\u0131ra k\u0131yasla \u00fcretimi daha kolayd\u0131r, bu da \u00fcst\u00fcn mekanik \u00f6zelliklere sahiptir ve bir\u00e7ok uygulamada saf bak\u0131ra etkili bir alternatif olarak kabul edilen yeterince y\u00fcksek bir termal iletkenlik sa\u011flar.<\/p>

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D\u00f6vme i\u00e7in CuCrZr ala\u015f\u0131m\u0131<\/strong>, \u00e7\u00f6zelti tavlamas\u0131 ve ya\u015flanma sertle\u015fmesi, \u00fczerinde ger\u00e7ekle\u015ftirilebilen ana \u0131s\u0131l i\u015flemlerdir, \u00e7\u00f6zelti tavlamas\u0131 LPBF CuCrZr ala\u015f\u0131mlar\u0131 durumunda atlanabilirken.<\/p>

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\u00c7\u00f6zelti tavlamas\u0131<\/strong>: Bu i\u015flem, malzemeyi koruyucu bir inert atmosferde (genellikle Ar) 900\u00b0C'nin \u00fczerinde 30 dakika veya birka\u00e7 saat \u0131s\u0131t\u0131larak ger\u00e7ekle\u015ftirilir. Daha sonra malzeme, bak\u0131r matrisi Cr ve Zr ile a\u015f\u0131r\u0131 doyurmak i\u00e7in su veya havada h\u0131zla so\u011futulur. LPBF par\u00e7alar\u0131 durumunda, bu i\u015flem zaten LPBF i\u015flemi s\u0131ras\u0131nda tamamlan\u0131r, \u00e7\u00fcnk\u00fc eriyik havuzu, bir s\u00f6nd\u00fcrme g\u00f6revi g\u00f6recek ve a\u015f\u0131r\u0131 doymu\u015f bir mikro yap\u0131 \u00fcretecek kadar h\u0131zl\u0131 so\u011fur. \u00c7\u00f6zelti tavlanm\u0131\u015f par\u00e7alar \u00e7ok yumu\u015fakt\u0131r ve mekanik \u00f6zellikleri \u00e7ok zay\u0131ft\u0131r, bu da ayr\u0131 bir \u0131s\u0131l i\u015flem olarak kabul edilemez.<\/p>

Ya\u015flanma sertle\u015fmesi<\/strong>: Tipik olarak, bu i\u015flem \u00e7\u00f6zelti tavlamas\u0131n\u0131 takip eder ve daha d\u00fc\u015f\u00fck s\u0131cakl\u0131klarda daha uzun bir s\u00fcre boyunca (tipik olarak 400\u00b0C ila 600\u00b0C aras\u0131nda, inert bir ortamda (Ar, vakum, N2 ve bazen de H2 atmosferinde) 6 saate kadar) ger\u00e7ekle\u015ftirilir. Bu i\u015flem, Cu, Cr ve Zr'nin ikili veya \u00fc\u00e7l\u00fc bile\u015fiklerini \u00fcretmek i\u00e7in a\u015f\u0131r\u0131 doymu\u015f malzemelerde sert intermetalik fazlar\u0131n kontroll\u00fc olarak \u00e7\u00f6kelmesini sa\u011flamak \u00fczere tasarlanm\u0131\u015ft\u0131r.<\/p>

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Bu \u00e7al\u0131\u015fmada, yaln\u0131zca ya\u015flanma sertle\u015fmesi<\/strong> s\u0131cakl\u0131k 550 \u00b0C'ye sabitlenerek incelenir, \u00fc\u00e7 farkl\u0131 s\u00fcre kontrol edilmi\u015ftir. Ama\u00e7, \u0131s\u0131l i\u015flem s\u00fcresinin malzemenin nas\u0131l etkiledi\u011fini ve ya\u015flanma sertle\u015fme i\u015fleminin, f\u00fczyon reakt\u00f6r bile\u015fenleri i\u00e7in eklemeli imalat kullan\u0131larak CuCrZr'nin mekanik gereksinimlerini kar\u015f\u0131lamak i\u00e7in uygulanabilir olup olmad\u0131\u011f\u0131n\u0131 anlamakt\u0131.<\/p>

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Bu tozlar\u0131n kimyasal bile\u015fimi, par\u00e7ac\u0131k boyutu da\u011f\u0131l\u0131m\u0131 (PSD) ve par\u00e7ac\u0131k \u015fekli<\/strong> bu \u00e7al\u0131\u015fmada kullan\u0131lan a\u015fa\u011f\u0131daki Sertifikada g\u00f6sterilmektedir:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Bu \u00e7al\u0131\u015fmada, inceleme i\u00e7in kullan\u0131lan numuneler, net \u015fekle yak\u0131n geometrilere bas\u0131lm\u0131\u015ft\u0131r. Daha sonra numune, kaba cildi \u00e7\u0131karmak ve numuneyi sertlik testleri i\u00e7in do\u011fru geometriye getirmek i\u00e7in i\u015flenir.<\/p>

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Tarama aral\u0131\u011f\u0131 (0,06-0,1 mm aral\u0131\u011f\u0131nda), lazer h\u0131z\u0131 (350 ila 650 mm\/s'den) ve lazer g\u00fcc\u00fc 370W'de tutularak, \u015ferit geni\u015fli\u011fi 5 mm'ye sabitlenerek ve katman kal\u0131nl\u0131\u011f\u0131 t\u00fcm katmanlar i\u00e7in 0,03 mm'ye sabitlenerek, numunelerin en y\u00fcksek yo\u011funlu\u011funu elde etmek i\u00e7in parametre optimizasyonu ger\u00e7ekle\u015ftirilir. Her katmanda, \u015feritlerin y\u00f6n\u00fc 67\u00b0 d\u00f6nd\u00fcrme ile de\u011fi\u015fir. Bu projedeki dikey y\u00f6nelim, yap\u0131 y\u00f6nelimi ile ayn\u0131d\u0131r. \u015eemas\u0131 \u015eekil 1<\/strong>:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 1. Eklemeli imalat i\u015fleminin \u015fematik diyagram\u0131<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Farkl\u0131 tarama aral\u0131\u011f\u0131 ve tarama h\u0131z\u0131 kombinasyonlar\u0131na sahip k\u0131rk k\u00fcp (10 mm x 10 mm x 10 mm) yap\u0131lm\u0131\u015ft\u0131r. Daha sonra yo\u011funluklar\u0131 Ar\u015fimet y\u00f6ntemi ile \u00f6l\u00e7\u00fcl\u00fcr.<\/p>

Yap\u0131lan numuneler \u00fc\u00e7 ile i\u015flendi ya\u015flanma sertle\u015fmesi<\/strong> 1 saat, 3 saat ve 6 saat s\u00fcreyle 550 \u00b0C'de, 150 \u00b0C\/saat \u0131s\u0131tma ve so\u011futma e\u011frisine sahip bir azot atmosferinde (f\u0131r\u0131nda ve koruyucu bir atmosferde so\u011futma).<\/p>

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Histogram \u015eekil 2<\/strong> Ar\u015fimet y\u00f6ntemi ile \u00f6l\u00e7\u00fclen t\u00fcm \u00e7al\u0131\u015fma proses parametrelerinin ortalama ba\u011f\u0131l yo\u011funlu\u011funu g\u00f6stermektedir. Referans yo\u011funluk 8,8869 g\/cm3'e e\u015fittir. Bu de\u011fer daha sonra eklemeli olarak \u00fcretilen numunenin ba\u011f\u0131l yo\u011funlu\u011funu hesaplamak i\u00e7in kullan\u0131l\u0131r.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 2. Numunelerin ba\u011f\u0131l yo\u011funlu\u011fu, proses parametrelerinin bir fonksiyonu olarak<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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En y\u00fcksek ba\u011f\u0131l yo\u011funluk (,15), a\u015fa\u011f\u0131daki proses parametreleri kullan\u0131larak elde edilmi\u015ftir: lazer g\u00fcc\u00fc 370 W, tarama aral\u0131\u011f\u0131 (kulu\u00e7ka mesafesi) 0,07 mm, tarama h\u0131z\u0131 450 mm\/s ve \u015ferit geni\u015fli\u011fi 5 mm. 0,07 mm'lik bir tarama aral\u0131\u011f\u0131nda, farkl\u0131 tarama h\u0131zlar\u0131nda ba\u011f\u0131l yo\u011funlukta \u00f6nemli bir de\u011fi\u015fiklik olmam\u0131\u015ft\u0131r.<\/p>

0,06 mm'lik bir tarama aral\u0131\u011f\u0131, yo\u011funluk i\u00e7in iyi de\u011fildir ve -98,5 aral\u0131\u011f\u0131nda yo\u011funluk de\u011ferleri ile sonu\u00e7lan\u0131r. Bunun nedeni, nihai yo\u011funlu\u011fu azaltan a\u015f\u0131r\u0131 \u0131s\u0131nmaya yol a\u00e7an \u0131s\u0131 birikimi olabilir.<\/p>

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\u015eekil 3'te g\u00f6sterilmektedir.<\/strong> 1 saat ve 6 saat ya\u015flanma i\u015fleminden sonra numunelerin mikro yap\u0131s\u0131n\u0131 g\u00f6sterir. Daha uzun ya\u015flanma sertle\u015fme s\u00fcresinin, d\u00fc\u015f\u00fck b\u00fcy\u00fctmelerde g\u00f6zlemlenebilen mikro yap\u0131sal \u00f6zellikleri de\u011fi\u015ftirmedi\u011fini, 6 saatlik s\u00fcreye k\u0131yasla 1 saatlik s\u00fcreyi g\u00f6stermi\u015ftir.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 3. 1 saat ve 6 saat numunelerin mikro yap\u0131lar\u0131<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 4<\/strong> 6 saatlik numunenin SEM mikrograflar\u0131n\u0131 g\u00f6stermektedir. \u00d6zellikle s\u00fctun tanelerinde (\u015eekil 5c'de) g\u00f6r\u00fclebilen bir\u00e7ok dairesel par\u00e7ac\u0131k g\u00f6sterdi, bunlar nano sertle\u015ftirilmi\u015f par\u00e7ac\u0131klar olabilir. Bu nano boyutlu \u00e7\u00f6keltiler i\u00e7in EDS taraf\u0131ndan yap\u0131lan daha fazla inceleme, malzemenin i\u00e7inde e\u015fit olarak da\u011f\u0131lm\u0131\u015f birka\u00e7 ila 50 nanometreden k\u00fc\u00e7\u00fck Cr veya Zr \u00e7\u00f6keltileri oldu\u011funu g\u00f6stermi\u015ftir.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 4 550 \u00b0C'de 6 saat ya\u015fland\u0131ktan sonra farkl\u0131 b\u00fcy\u00fctmelerdeki SEM sekonder elektron g\u00f6r\u00fcnt\u00fcleri<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u00c7al\u0131\u015f\u0131lan numunelerde kusurlar da g\u00f6zlemlenmi\u015ftir. \u015eekil 5<\/strong> esas olarak gaz tutulmas\u0131yla olu\u015fturulan, f\u00fczyon eksikli\u011fi (LoF) ve g\u00f6zeneklilik gibi AM par\u00e7alar\u0131nda tipik olan baz\u0131 kusurlar\u0131 g\u00f6stermektedir.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 5 LPBF'nin yap\u0131lm\u0131\u015f numunesinin kesitinde bulunan kusurlar<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 6<\/strong> yap\u0131lm\u0131\u015f ve \u0131s\u0131l i\u015flem g\u00f6rm\u00fc\u015f numuneler i\u00e7in Vickers mikro sertlik de\u011ferleridir. Ya\u015fland\u0131r\u0131lm\u0131\u015f numunelere k\u0131yasla yap\u0131lm\u0131\u015f ko\u015fullarda sertli\u011fin daha d\u00fc\u015f\u00fck oldu\u011funu anlamak kolayd\u0131r: 550 \u00b0C'de 1 saat ya\u015flanma, bu sertli\u011fi \u00f6nemli \u00f6l\u00e7\u00fcde iyile\u015ftirir (165 HV, yap\u0131lm\u0131\u015f numunelerde 84 HV de\u011ferinin iki kat\u0131). 3 saat ya\u015flanmadan sonra, numunenin sertli\u011fi azalmaya ba\u015flad\u0131 (ortalama 144 HV) ve<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u015eekil 6 Yerle\u015fik ve ya\u015fland\u0131r\u0131lm\u0131\u015f numuneler i\u00e7in Vickers mikro sertlik de\u011ferleri<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\u00d6zetle, mekanik a\u00e7\u0131dan ya\u015fland\u0131rma i\u015flemi, LPBF CuCrZr ala\u015f\u0131m\u0131n\u0131n mekanik \u00f6zelliklerinin iyile\u015ftirilmesi i\u00e7in umut vericidir. Ancak, toz \u00f6zellikleri, LPBF parametreleri ve ya\u015fland\u0131rma prosesinin \u00f6nceden kombinasyonunu bulmak i\u00e7in baz\u0131 ara\u015ft\u0131rmalar yap\u0131lmas\u0131 gerekir.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

CuCrZr (C18150) alloy is a precipitation-hardening alloy known for its high mechanical, thermal, and electrical properties. The alloy is widely used in heat exchange devices and in the field of nuclear fusion. \u00a0 CuCrZr alloy is a very attractive alloy that can replace pure copper in many applications, with Cr in the range of 0.5 […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"post_folder":[],"class_list":["post-8388","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/posts\/8388","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/comments?post=8388"}],"version-history":[{"count":4,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/posts\/8388\/revisions"}],"predecessor-version":[{"id":8399,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/posts\/8388\/revisions\/8399"}],"wp:attachment":[{"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/media?parent=8388"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/categories?post=8388"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/tags?post=8388"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/am-material.com\/tr\/wp-json\/wp\/v2\/post_folder?post=8388"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}