Cryogenic tensile behavior of carbon-doped CoCrFeMnNi high-entropy alloys additively manufactured by laser powder bed fusion
参考中译:激光粉床熔炼增材制备碳掺CoCrFeMnNi高熵合金的低温拉伸行为


          

刊名：Additive Manufacturing
作者：Haeum Park（Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)）
Hyeonseok Kwon（Department of Materials Science and Engineering, Pohang University of Science and Technology）
Kyung Tae Kim（Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)）
Ji-Hun Yu（Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)）
Jungho Choe（Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)）
Hyokyung Sung（Department of Materials Science and Engineering, Kookmin University）
Hyoung Seop Kim（Graduate Institute of Ferrous & Eco Materials Technology (GIFT), Pohang University of Science and Technology (POSTECH)）
Jung Gi Kim（Department of Materials Engineering and Convergence Technology (Center for K-Metals), Gyeongsang National University）
Jeong Min Park（Department of 3D Printing Materials, Korea Institute of Materials Science (KIMS)）
刊号：780C0044
ISSN：2214-8604
出版年：2024
年卷期：2024, vol.86
页码：104223-1--104223-12
总页数：12
分类号：TH16
关键词：High-entropy alloy；Laser powder bed fusion；Microstructure；Tensile behavior；Cryogenic temperature
参考中译：高密度合金;激光粉床熔化;显微组织;拉伸行为;低温
语种：eng
文摘：Cryogenic tensile behaviors of carbon-doped CoCrFeMnNi high-entropy alloy (C-HEA) printed by laser powder bed fusion (LPBF) were systematically explored. The LPBFed C-HEA exhibits excellent cryogenic tensile properties with not only high yield strength but also largely extended elongation as compared to those under room temperature deformation. In particular, the elongation of the C-HEA is twice as high at 77 K compared to 298 K. The strain hardening rate of LPBFed C-HEA under cryogenic deformation is much higher than that under plastic deformation at the room temperature, which contributes to the dramatic enhancement of uniform elongation by delaying plastic instability. Because the flow stress of C-HEA is significantly increased by temperature decrease, it can exceed the critical twinning stress at the early-stage deformation at 77 K. Deformation twins and nanocarbides synergistically contribute to the high back stress evolution of the C-HEA under cryogenic tensile deformation. This study can provide a new perspective on developing high-performance alloys for use in additive manufacturing in cryogenic applications.
参考中译：系统研究了激光粉床熔化(LPBF)法制备的掺碳CoCrFeMnNi高熵合金(C-HEA)的低温拉伸行为。LPBFed C-HEA具有优良的低温拉伸性能，与室温变形相比，不仅具有高的屈服强度，而且延伸率也大大提高。与298K相比，77K时C-HEA的延伸率提高了一倍。低温变形下的应变硬化率远高于室温塑性变形下的应变硬化率，这有助于通过延缓塑性失稳来显著提高延伸率的均匀性。由于C-HEA的流动应力随着温度的降低而显著增加，在77K变形初期可超过临界孪生应力，变形孪晶和纳米碳化物协同作用有助于C-HEA在低温拉伸变形下的高背应力演化。这项研究为开发用于低温应用添加剂制造的高性能合金提供了一个新的视角。



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