{"id":4814,"date":"2024-03-13T12:10:38","date_gmt":"2024-03-13T17:10:38","guid":{"rendered":"https:\/\/cqfa.quebec\/?p=4814"},"modified":"2024-03-13T12:15:40","modified_gmt":"2024-03-13T17:15:40","slug":"laser-powder-bed-fusion-additive-manufacturing-of-molybdenum-using-a-nitrogen-build-atmosphere","status":"publish","type":"post","link":"https:\/\/cqfa.quebec\/en\/laser-powder-bed-fusion-additive-manufacturing-of-molybdenum-using-a-nitrogen-build-atmosphere\/","title":{"rendered":"Laser powder bed fusion additive manufacturing of molybdenum using a nitrogen build atmosphere"},"content":{"rendered":"<p><em>Ramakrishnan, T.; Espiritu, E.R.L.; Kwon, S.; Keshavarz, M.K.; Muniz-Lerma, J.A.; Gauvin, R.; Brochu, M. (2024). Laser powder bed fusion additive manufacturing of molybdenum using a nitrogen build atmosphere<span data-ccp-props=\"{&quot;201341983&quot;:0,&quot;335559739&quot;:160,&quot;335559740&quot;:259}\">. International Journal of Refractory Metals and Hard Materials, vol. 119, February 2024, 106555.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p>A method was developed to suppress the\u00a0crack formation\u00a0during\u00a0laser powder bed fusion\u00a0(LPBF) of molybdenum (Mo). The method uses a nitrogen (N2) atmosphere to fabricate crack-free samples without any additional processing. To compare with the effect of the N<sub>2<\/sub>\u00a0atmosphere, samples were prepared under an argon (Ar) atmosphere as well with the same process parameters. The microstructure analyses by optical and high-resolution electron microscopy revealed that crack-free samples were produced under this condition, whereas grain boundary cracks were observed throughout the sample fabricated in Ar atmosphere. To understand the mechanism of crack prevention by nitrogen (N), the energetics of solute components in the BCC-Mo structure were studied by Density Functional Theory (DFT). The theoretical calculations showed that the introduction of N into the BCC-Mo hinders oxygen (O) diffusion, causing O entrapment in the lattice at interstitial positions. As a result, reduced\u00a0<a href=\"https:\/\/www.sciencedirect.com\/topics\/materials-science\/oxide-compound\">oxides<\/a>\u00a0within grains and at grain boundaries (GB) were observed. The results are consistent with the experimental observation made from the fracture surface investigation. The reduced\u00a0embrittlement\u00a0of GB from the reduced GB oxide formation is believed to suppress GB cracking.<\/p>\n<p>&nbsp;<\/p>\n<p class=\"link-btn-style btn-yellow\"><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S0263436824000039\" target=\"_blank\" rel=\"noopener\">Read the publication<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ramakrishnan, T.; Espiritu, E.R.L.; Kwon, S.; Keshavarz, M.K.; Muniz-Lerma, J.A.; Gauvin, R.; Brochu, M. (2024). Laser powder bed fusion additive manufacturing of molybdenum using a nitrogen build atmosphere. International Journal [&hellip;]<\/p>\n","protected":false},"author":80,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-4814","post","type-post","status-publish","format-standard","hentry","category-publications-academiques-quebecoises"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Laser powder bed fusion additive manufacturing of molybdenum using a nitrogen build atmosphere - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cqfa.quebec\/en\/laser-powder-bed-fusion-additive-manufacturing-of-molybdenum-using-a-nitrogen-build-atmosphere\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Laser powder bed fusion additive manufacturing of molybdenum using a nitrogen build atmosphere - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive\" \/>\n<meta property=\"og:description\" content=\"Ramakrishnan, T.; Espiritu, E.R.L.; Kwon, S.; Keshavarz, M.K.; Muniz-Lerma, J.A.; Gauvin, R.; Brochu, M. 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