N添加した低Ni省Mo型オーステナイト系ステンレス鋼の機械的特性に及ぼす内部水素の影響

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タイトル別名
  • Influence of Internal Hydrogen on Mechanical Properties of Nitrogen-added Austenitic Stainless Steel with Reduced Amount of Nickel and Molybdenum
  • N テンカ シタ テイNiショウ Moガタ オーステナイトケイ ステンレスコウ ノ キカイテキ トクセイ ニ オヨボス ナイブ スイソ ノ エイキョウ

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<p>To investigate an effect of internal hydrogen on mechanical properties of a new austenitic stainless steel “STH2” having a nominal composition of Fe-15%Cr-9%Mn-6%Ni-2.5%Cu-0.15~0.2%N, tensile tests and fatigue crack growth tests were conducted for the specimens containing around 80 ppm hydrogen charged by the exposure in 45 MPa hydrogen gas at 300˚C for 200 h and the ones heat treated in air with the same heat pattern.</p><p>At room temperature and –40˚C, no significant ductility drop by hydrogen charging was observed and about 80% of relative reduction of area was obtained, which is the same as that of JIS SUS316L with the same amount of internal hydrogen. In the specimens tensile tested at –40˚C, a small quantity of quasicleavage fracture surfaces were observed. In the banded areas in which Mn, Ni and Cu were negatively segregated, some relatively coarse voids coalesced with cracks extended along the maximum shear stress plane, which is similar to what is called void-sheet type of fracture. It is quite different from the case for tensile tests in 90 MPa hydrogen gas, in which coarse longitudinal cracks form, suggesting that the concentration of hydrogen at crack tips in 90 MPa hydrogen gas is higher than 80 ppm. It was also confirmed that fatigue crack growth rates were not accelerated by 80 ppm internal hydrogen although some faceted fracture surfaces composed of (111) γ formed.</p><p>It is confirmed that STH2 has excellent properties not only in high pressure hydrogen gas but also in the circumstance of internal hydrogen of around 80 ppm.</p>

収録刊行物

  • 鉄と鋼

    鉄と鋼 103 (1), 54-63, 2017

    一般社団法人 日本鉄鋼協会

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