Unravelling the origin of multiple cracking in an additively manufactured Haynes 230. Issue 4 (3rd April 2023)

• Record Type: Journal Article
• Authors: He, Junyang; Wang, Rui; Li, Na; Xiao, Zhongrun; Gu, Ji; Yu, Hongyao; Bi, Zhongnan; Liu, Weihong; Song, Min
• Is Part Of: Materials research letters. Volume 11:Issue 4(2023)
• Page Start: 281
• Page End: 288
• Publication Date: 2023-04-03
• Subjects: Ni-based superalloy -- additive manufacturing -- cracking -- elemental segregation -- atom probe tomography; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2022.2148491
• Languages: English
• ISSNs: 2166-3831

Abstract

ABSTRACT: In this work, by using multi-scale characterizations from electron channeling contrast imaging (ECCI) to atom probe tomography (APT), we directly evidenced that the massive cracking events in the selective-laser-melted (SLMed) Haynes 230 superalloy are due to the continuous decoration of an M23 C6- type thin film at grain boundaries. The high-melting-point nature of the carbide rules out the possibility of liquidation cracking, while the long and straight film surface facilitates stress-induced solid-state cracking. Impurities, Si, Mn and Fe, greatly enhance the cracking susceptibility despite the interesting fact that they are strongly depleted from the carbide. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: The massive cracking events in the selective-laser-melted Haynes 230 superalloy are due to the continuous decoration of an M23 C6 film at grain boundaries, regardless of the detailed cracking modes.