{"id":5729,"date":"2025-08-19T09:14:25","date_gmt":"2025-08-19T14:14:25","guid":{"rendered":"https:\/\/cqfa.quebec\/?p=5729"},"modified":"2025-08-19T09:17:12","modified_gmt":"2025-08-19T14:17:12","slug":"laser-direct-energy-deposition-of-the-high-%ce%b3%e2%80%b2-lw-4280-ni-based-superalloy","status":"publish","type":"post","link":"https:\/\/cqfa.quebec\/en\/laser-direct-energy-deposition-of-the-high-%ce%b3%e2%80%b2-lw-4280-ni-based-superalloy\/","title":{"rendered":"Laser-direct energy deposition of the high \u03b3\u2032 LW 4280 Ni-based superalloy"},"content":{"rendered":"<p><em>Jena, A.; Gontcharov, A.B.; Lowden, P.; Brochu, M. (2025<\/em>). Laser-direct energy deposition of the high \u03b3\u2032 LW 4280 Ni-based superalloy<em>. <\/em><em>Journal of Alloys and Compounds, vol. 1026, may 2025, 180503.<\/em><\/p>\n<p>&nbsp;<\/p>\n<p>This study investigates the structure-properties relationships of LW 4280 processed using laser direct energy deposition. The alloy exhibited a typical dendritic microstructure in the as-deposited condition, with a significant\u00a0microsegregation\u00a0of alloying elements. Fine \u03b3\u2032 precipitates were present in the dendrite cores, while the interdendritic regions showed relatively coarser \u03b3\u2032 precipitates and Ta, Hf, and W-based\u00a0carbides. The \u03b3\u2032 precipitates were enriched in Al, and Ta, whereas the \u03b3 matrix was rich in Cr, Co, W, Re and Mo. The application of a two-step sub-solvus heat treatment to the as-deposited specimens resulted in the growth of Ta, Hf, and W-based carbides, the formation of Cr-based carbides, and a bimodal distribution of roughly 49\u202f% \u03b3\u2032 precipitates. Despite heat treatments, chemical variations persisted between dendrite cores and interdendritic regions. The difference in\u00a0lattice parameters\u00a0between the \u03b3 phase and \u03b3\u2032 precipitates was used to determine the\u00a0lattice mismatch\u00a0in both the as-deposited and heat-treated specimens. The heat treatment increased the hardness from 434\u202f\u00b1\u202f15 HV<sub>0.1<\/sub>\u00a0to 495\u202f\u00b1\u202f17 HV<sub>0.1<\/sub>. Heat-treated specimens also exhibited excellent thermophysical and mechanical properties at both room temperature and elevated temperatures.\u00a0Stress rupture tests\u00a0at elevated temperatures revealed an outstanding rupture life, including 1084\u202fh at 788 \u00b0C\/448\u202fMPa, 119\u202fh at 871 \u00b0C\/276\u202fMPa, 458\u202fh at 927 \u00b0C\/179\u202fMPa, and 93\u202fh at 982 \u00b0C\/138\u202fMPa. Axial\u00a0fatigue tests\u00a0were conducted at 982 \u00b0C under\u00a0stress amplitudes\u00a0of 168, 134, and 121\u202fMPa, resulting in\u00a0fatigue lives\u00a0of 3.5E+\u202f06, 1.0E+\u202f07, and 1.13E+\u202f07 cycles, respectively.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p class=\"link-btn-style btn-yellow\"><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S092583882502064X\" target=\"_blank\" rel=\"noopener\">Read the publication<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jena, A.; Gontcharov, A.B.; Lowden, P.; Brochu, M. (2025). Laser-direct energy deposition of the high \u03b3\u2032 LW 4280 Ni-based superalloy. Journal of Alloys and Compounds, vol. 1026, may 2025, 180503. [&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-5729","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-direct energy deposition of the high \u03b3\u2032 LW 4280 Ni-based superalloy - 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-direct-energy-deposition-of-the-high-%ce%b3%e2%80%b2-lw-4280-ni-based-superalloy\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Laser-direct energy deposition of the high \u03b3\u2032 LW 4280 Ni-based superalloy - CQFA - Carrefour qu\u00e9b\u00e9cois de la fabrication additive\" \/>\n<meta property=\"og:description\" content=\"Jena, A.; Gontcharov, A.B.; Lowden, P.; Brochu, M. (2025). Laser-direct energy deposition of the high \u03b3\u2032 LW 4280 Ni-based superalloy. Journal of Alloys and Compounds, vol. 1026, may 2025, 180503. 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