TY - JOUR
T1 - Ductility loss in ductile cast iron with internal hydrogen
AU - Matsunaga, Hisao
AU - Usuda, Teruki
AU - Yanase, Keiji
AU - Endo, Masahiro
N1 - Funding Information:
The authors thank Mr. Kenshin Matsuno of Shin-Maywa Industries, Ltd. and Mr. Kazuhisa Hatakey-ama of National Institute of Advanced Industrial Science and Technology (AIST) for their support in the experimental work. The authors thank Prof. Yukitaka Murakami of Kyushu University and Prof. Dietmar Eifler of University of Kaiserslautern for a series of private communications. This research has been supported in part by the International Institute for Carbon–Neutral Energy Research (WPI-I2CNER), sponsored by the Japanese Ministry of Education, Culture, Sport, Science and Technology; and the NEDO, Fundamental Research Project on Advanced Hydrogen Science (2006 to 2012).
PY - 2014/3
Y1 - 2014/3
N2 - Hydrogen-induced ductility loss in ductile cast iron (DCI) was studied by conducting a series of tensile tests with three different crosshead speeds. By utilizing the thermal desorption spectroscopy and the hydrogen microprint technique, it was found that most of the solute hydrogen was diffusive and mainly segregated at the graphite, graphite/matrix interface zone, and the cementite of pearlite in the matrix. The fracture process of the non-charged specimen was dominated by the ductile dimple fracture, whereas that of the hydrogen-charged specimen became less ductile because of the accompanying interconnecting cracks between the adjacent graphite nodules. Inside the hydrogen-charged specimen, the interspaces generated by the interfacial debonding between graphite and matrix are filled with hydrogen gas in the early stage of the fracture process. In the subsequent fracture process, such a local hydrogen gas atmosphere coupled with a stress-induced diffusion attracts hydrogen to the crack tip, which results in a time-dependent ductility loss.
AB - Hydrogen-induced ductility loss in ductile cast iron (DCI) was studied by conducting a series of tensile tests with three different crosshead speeds. By utilizing the thermal desorption spectroscopy and the hydrogen microprint technique, it was found that most of the solute hydrogen was diffusive and mainly segregated at the graphite, graphite/matrix interface zone, and the cementite of pearlite in the matrix. The fracture process of the non-charged specimen was dominated by the ductile dimple fracture, whereas that of the hydrogen-charged specimen became less ductile because of the accompanying interconnecting cracks between the adjacent graphite nodules. Inside the hydrogen-charged specimen, the interspaces generated by the interfacial debonding between graphite and matrix are filled with hydrogen gas in the early stage of the fracture process. In the subsequent fracture process, such a local hydrogen gas atmosphere coupled with a stress-induced diffusion attracts hydrogen to the crack tip, which results in a time-dependent ductility loss.
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U2 - 10.1007/s11661-013-2109-9
DO - 10.1007/s11661-013-2109-9
M3 - Article
AN - SCOPUS:84895920872
SN - 1073-5623
VL - 45
SP - 1315
EP - 1326
JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
IS - 3
ER -