Hydrogen-assisted ductile fracture in porous iron |
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| Affiliation: | 1. Department of Speech Pathology and Audiology, School of Human and Community Development, University of the Witwatersrand, Johannesburg, South Africa – PhD in Audiology (University of the Witwatersrand), South Africa;2. Department of Speech Pathology and Audiology, School of Human and Community Development, University of the Witwatersrand, Johannesburg, South Africa – Master''s in Audiology (University of the Witwatersrand), South Africa;1. Department of Hematology, Blood Neoplasms and Bone Marrow Transplantation, Medical University, Wrocław, Poland;2. Department of Histology and Embryology, Medical University, Wrocław, Poland;1. Department of Cytology & Histology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia 41522, Egypt;2. State Key Laboratory of Development Biology, Institute of Genetics & Developmental Biology, Chinese Academy of Sciences, Beijing, China;1. Universidade Federal do Amazonas, Departamento de Genética, Av. General Rodrigo Octavio, 6200, Manaus AM, 69080-900, Brazil;2. Programa de Pós-Graduação em Genética, Universidade Federal do Paraná, Centro Politécnico, Jardim das Américas, 81531-990, Caixa-Postal, 19071, Curitiba, Paraná, Brazil;3. Universidade Federal de São Carlos, Departamento de Genética e Evolução, Rodovia Washington Luís Km 235, São Carlos SP, 13565-905, Brazil;4. Universidade Tecnológica Federal do Paraná, Campus Santa Helena, Prolongamento da Rua Cerejeira, s/n, Santa Helena PR, 85892-000, Brazil;5. Universidade Estadual do Oeste do Paraná, Centro de Ciências Biológicas e da Saúde, Rua Universitária, 2069, Cascavel PR, 85819-110, Brazil;6. Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Biociências, Departamento de Morfologia, Distrito de Rubião Jr., s/n, Botucatu SP, 18618-970, Brazil;7. Universidade Estadual de Maringá, Núcleo de Pesquisas em Ictiologia e Aquicultura, Av. Colombo, 5790, Maringá PR, 87020-900, Brazil;1. School of Mathematical Sciences, South China Normal University, Guangzhou 510631, China;2. Department of Mathematics, City University of Hong Kong, Hong Kong, China |
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| Abstract: | The present paper has studied the effect of porosity and hydrogen on the deformation and fracture properties in porous iron using double notched specimen tests and quantitative metallography analyses to characterize void growth. The presence of hydrogen produced the greatest hardening effect in the sample with a porosity of 0.037. It was found that while the effect of hydrogen on the reduction in area was greatest in the specimen with a porosity of 0.037, its effect on the fracture energy did not depend on the porosity. The ductile fracture surface morphology remained the same in all the specimens without and with hydrogen except for the sample with porosity of 0.003 where hydrogen induced some quasi-cleavage fracture. The quantitative metallography analysis of voids in the region near the fracture surface and below the unfractured notch has demonstrated that hydrogen causes the void growth to increase prior to plastic instability. The effect of hydrogen on the void growth was found to be slightly enhanced as the porosity was increased. The microscopic process of hardening induced by hydrogen is presented. The mechanism for hydrogen-assisted void growth is discussed in light of a recently developed model using a dislocation theory. |
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