1. Kobe Material Testing Laboratory Co., Ltd., 47-13 Niijima, Harima-cho, Kako-gun, Hyogo 675-0155, Japan, https://orcid.org/0000-0002-4963-9708 (M.T.), https://orcid.org/0000-0001-6442-1830 (C.H.)
2. Kobe Material Testing Laboratory Co., Ltd., 1270-60 Tomecho, Hitachi, Ibaraki 319-1231, Japan, https://orcid.org/0000-0002-0024-166X
3. Kobe Material Testing Laboratory Co., Ltd., ASANO Building F1, 4-10-3 Higashi-Ueno, Taito-Ku, Tokyo 110-0015, Japan (Corresponding author), e-mail: anitta@kmtl.co.jp, https://orcid.org/0000-0003-1028-1937
4. Materials Science Division, Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, Japan, https://orcid.org/0000-0002-9399-1813