オーステナイト系不銹鋼の加熱および腐食による脆化について

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  • Embrittlement of an austenitic Stainless Steel Caused by Heating and Corrosion
  • オーステナイトケイ フシュウコウ ノ カネツ オヨビ フショク ニ ヨル ゼイカ ニ ツイテ

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A study was made to examine embrittlement of austenitic stainless steels of types 304, 316L and 347 caused by heating and by corrosion. The heating, in this case, does not mean only a simple heating of the specimen in a muffle furnace but also combination of fatigue or creep at elevated temperatures. An embrittlement of the specimen was examined by a tensile impact test using Charpy tester at room temperature. The impact value of the specimens slightly decrease due to the heating for long time, say about 100 hrs or more, and this may be attributed to carbide precipitation during the heating. After heating the specimens for up to 500 hrs, they were immersed into 0.1 mole uranium sulphate aqueous solution for up to 30 days. A drastic decrease in the impact value was observed and some of the specimens were degraded by the corrosion somewhat like a weathering of granite rocks. The phenomenon seems to be an extreme case of intergranular corrosion, and the composition of the specimen and the heating temperature prior to corrosion may be considered as major factors to control the phenomenon. Type 304 steel reveals such drastic corrosion embrittlement and the tendency is a most remarkable when the specimen is heated at about 600°C prior to the corrosion, while others reveal no appreciable corrosion embrittlement.

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