| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for causing a hardened texture to appear by corrosion, and detecting the hardened texture of steel even if a type of the steel, especially low-carbon steel with a carbon concentration of 0.01 mass% or less has a low solute element concentration within the steel and it is conventionally difficult to clearly detect the hardened texture. Ž<P>SOLUTION: In the method for causing the hardened texture of the steel, a cross section of a sample of a steel casting piece is polished. A polished surface 2 of the sample 1 is downwardly placed. An immersion depth d of the polished surface 2 of the sample is 10 mm or less. The polished surface 2 is corroded. While one or both of the sample and a corrosion liquid are vibrated by ultrasonic waves, the polished surface is corroded. Since only a portion of the sample including the polished surface (the corroded surface) of the sample is immersed into the corrosion liquid and corroded, the hardened texture appears in a type of the steel, especially the low-carbon steel with a carbon concentration of 0.01 mass% or less whose hardened texture is conventionally difficult to appear. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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