| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2020: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2019: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Outline of Final Research Achievements |
In this study, 1800-2000 MPa-class ultra-high strength low-alloy steels with ultrafine elongated grain structures were created by a thermomechanical treatment. The notched round-bar specimens and ultra-high strength bolts that were fabricated from the ultra-high strength low-alloy steels were fastened and subjected to outdoor exposure tests at the exposure site in National Institute for Materials Science, and at the in Miyako Island test site of Japan Weathering Test Center, respectively. Delayed fracture behavior of the ultra-high strength low-alloy steels was clarified in association with the ultrafine elongated grain structures, hydrogen uptake and the data obtained by accelerated delayed fracture tests.
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