In situ scanning electron microscopy of hydrogen embrittlement by near atmospheric-pressure hydrogen microplasma jet

Author:

Tomatsu Kota1ORCID,Aoki Takahiro1,Kobayashi Kenji2ORCID,Omura Tomohiko2,Hatta Akimitsu3ORCID

Affiliation:

1. Nippon Steel Corporation Amagasaki Research and Development Center 1 , 1-8 Fuso-Cho, Amagasaki, Hyogo 660-0891, Japan

2. Nippon Steel Corporation RE Center 2 , 20-1 Shintomi, Futtsu, Chiba 293-8511, Japan

3. Department of Electronic and Photonic Systems Engineering, Kochi University of Technology 3 , Tosayamada-cho, Kami, Kochi 782-8502, Japan

Abstract

Elucidation of microstructures responsible for hydrogen embrittlement is hoped for research and development of high-strength low-alloy steel. For this purpose, a novel in situ scanning electron microscopy method of hydrogen embrittlement was developed by using a near atmospheric-pressure hydrogen microplasma jet excited by pulsed glow discharge. By the developed method, propagations of hydrogen embrittlement cracks in typical martensitic steel, Japanese Industrial Standards SCM435 steel, were successfully observed at frame rates at least up to 10.2 Hz with the same image quality as in high vacuum. The hydrogen microplasma jet neither elevated the specimen temperature nor damaged the specimen surface. Strain evolution prior to the crack propagations was also successfully observed in conjunction with the digital image correlation technique. It was found that a small electron scattering cross section of the hydrogen molecule, a large density of hydrogen ions in the near atmospheric-pressure microplasma jet, and stabilization of the glow discharge by the electron beam of the scanning electron microscope play a crucial role in the realization of the in situ observations.

Publisher

AIP Publishing

Subject

Instrumentation

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