| 摘要 |
<p>PURPOSE:To enable nondestructive short-time evaluation by evaluating life according to the ratio of the area of carbide formed at a crystal grain boundary and the area of a fine defect. CONSTITUTION:A sample is sampled by using a replica method and information obtained through the observation of an electron microscope is quantized by an image analysis. Then the area of carbide 2 formed at the crystal grain boundary 1 of the heat-resisting steel and the area of the fine defect 3 are found and a life predicted value is obtained from a life evaluation curve based upon the relation between the area ratio and creep damage under various conditions found from the area ratio previously. Consequently, the life evaluation is performed in a short time without destruction.</p> |
