Effect of Hydrogen on the Substructure of Lenticular Martensite in Fe-31Ni Alloy
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MICROSTRUCTURES and properties of steels can be effectively controlled by the addition of alloying elements, particularly interstitial elements. Carbon and nitrogen are the most important interstitial elements in steels, and they have been actively used for control and improvement of several properties in steels. Although hydrogen is also an interstitial element for steels, it is well known that hydrogen degrades mechanical properties, that is, hydrogen embrittlement.[1–3] Accordingly, AKINOBU SHIBATA and NOBUHIRO TSUJI are with the Department of Materials Science and Engineering, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan and also with the Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan. Contact e-mail: [email protected] NAHOKO SAJI and HIROTAKA TAI are with the Department of Materials Science and Engineering, Kyoto University. MASANORI ENOKI and HIROSHI OHTANI are with the Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. MOTOMICHI KOYAMA is with the Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan. KANEAKI TSUZAKI is with the Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan and also with the Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University. Manuscript submitted December 5, 2018. Article published online June 26, 2019 METALLURGICAL AND MATERIALS TRANSACTIONS A
we usually try to eliminate hydrogen from steels to avoid hydrogen embrittlement. However, there remains a possibility for using hydrogen effectively in steels if we can accurately understand the influence of hydrogen on the microstructures and properties of steels. There are several reports about effect of hydrogen on plastic deformation behavior in steels.[4–9] For example, Hirth[4] proposed that hydrogen enhanced the mobility of dislocations based on internal friction and mechanical property studies. Robertson et al.[5–7] conducted deformation experiments using a transmission electron microscope equipped with an environmental cell and directly confirmed hydrogen-accelerated dislocation motion. On the other hand, Tanino et al.[8] reported that hydrogen charging to a transmission electron microscopy (TEM) thin foil of ferritic stainless steel induced microtwins. Because lattice invariant deformation is a plastic deformation to accommodate the transformation strain of martensitic transformation, it can be expected that hydrogen would affect the substructure of martensite. There are many articles concerning hydrogen and martensite, for example, the relationship between hydrogen-related fracture behavior and the microstructure of martensite[10–13] and the effect of deformation-induced martensitic transformation on hydrogen-induced crack growth.[14–16] However, no study investigated the effect of hydrogen on the substru
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