Gao, Zhe Lee, Dong-Hyun Zhao, Yakai Wang, Pei Murakami, Kotaro Komazaki, Shin-ichi Suh, Jin-Yoo Kim, Hyoung Seop Ramamurty, Upadrasta Jang, Jae-il 2024-05-30T09:30:15Z 2024-05-30T09:30:15Z 2024-05-30 2024-06 1359-6454 https://pubs.kist.re.kr/handle/201004/149960 The hydrogen trapping and micromechanical behaviors of additively manufactured CoCrFeNi high-entropy alloy (HEA) using the laser powder bed fusion (L-PBF) technique in the as-built and pre-strained states were explored through nanoindentation and micro-tensile experiments combined with thermal desorption analysis. To analyze the influence of pre-straining, both global pre-strains, imposed using the interrupted tensile tests, and local strain levels, estimated using the digital image correlation measurements, were employed. It was revealed that prestraining (which increases the dislocation density in the alloy) does not enhance the hydrogen effects on the micromechanical performance of the L-PBF HEA. To understand this, rather unexpected, result, we investigated the trapping behavior of diffusional hydrogen in detail, through thermal desorption analysis combined with the Ag decoration technique. The results are discussed in terms of the hydrogen contents and trapping sites in the LPBF HEA. English Elsevier BV Hydrogen trapping and micromechanical behavior in additively manufactured CoCrFeNi high-entropy alloy in as-built and pre-strained conditions Article 10.1016/j.actamat.2024.119886 1 Acta Materialia, v.271 Acta Materialia 271 N scie scopus 001224273900001 2-s2.0-85189562124 Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Materials Science Metallurgy & Metallurgical Engineering Article AUSTENITIC STAINLESS-STEEL HIGH-STRENGTH STEEL GRAIN-SIZE MECHANICAL-PROPERTIES THERMAL-ANALYSIS INDUCED CRACKING EMBRITTLEMENT DEFORMATION RESISTANCE MICROSTRUCTURE Additive manufacturing High -entropy alloy Hydrogen trapping Nanoindentation