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A comparative study of the embrittlement of monel 400 at room temperature by hydrogen and by mercury

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Abstract

Slow strain rate tensile tests were performed at room temperature on Monel 400 specimens of grain sizes 35 to 500 μm, in the environments of air, mercury, and electrolytically generated hydrogen. Specimens of grain size 250 μm were tested at a range of strain rates in the three environments. It was found that cracks initiated easiest in hydrogen but propagated easiest in mercury; consequently the embrittlement was usually more severe in mercury. The embrittlement decreased with increasing strain rate, and with increasing grain size in hydrogen. Embrittlement in mercury was a maximum at intermediate grain sizes. A fracture sequence of intergranular to transgranular to microvoid coalescence was common. The intergranular and transgranular fractures are interpreted in terms of the reduced cohesive stress and enhanced shear models of embrittlement, respectively.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Oklahoma State University, 74078, Stillwater, OK

    C. E. Price (Professor)

  2. Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, 45433, OH

    R. S. Fredell (Project Engineer)

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  1. C. E. Price
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  2. R. S. Fredell
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Price, C.E., Fredell, R.S. A comparative study of the embrittlement of monel 400 at room temperature by hydrogen and by mercury. Metall Trans A 17, 889–898 (1986). https://doi.org/10.1007/BF02643865

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