| 摘要 |
PURPOSE:To detect the degree of embrittlement effectively, by magnetically measuring the amount of ferrite after prolonged use of machine members made of ferrite-containing stainless steel to determine the degree of toughness from a master curve between the amount of ferrite and the degree of toughness. CONSTITUTION:As there is a certain correlation between the degree of embrittlement and the amount of ferrite, the relationship between the degree of embrittlement and the amount of ferrite is determined experimentally to prepare a master curve. Then, the amount of ferrite is measured with a ferrite scope after prolonged 500 deg.C heating treatment of a cylindrical member made of 20% Cr-10% Ni ferrite-austenite 2-phase stainless steel to detect the degree of embrittlement based on the master curve. Thus, the degree of embrittlement of the machine member is detected in a non-destructive manner and quickly to prevent damage due to embrittlement thereby elevating the safety margin. |
