12%Cr-Mo-W-V 綱の長時間加熱による材質劣化の非破壊検出(<小特集>X線材料強度小特集)

概要

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As the first step of the study on non-destructive evaluation of material damage and residual life for martensitic stainless steel machine parts used at high-temperatures, three methods of non-destructive material testing were adapted for the detection of micro-structural changes caused by Its obtained are summarized as follows : long-term heating in 12% Cr-Mo-W-V steel. The result obtained are summarized as follows : (1) As the material deterioration caused by long-term heating, softening was dominant under the condition of high temperature and long heating time. Before the occurence of softening, embrittlement was observed. (2) The ratio of hardness to the initial hardness showed a simple relation with Larson-Miller parameter for normally heat treated 12% Cr-Mo-W-V steel. Thus the hardness test is effective for the estimation of service history of the machine parts. (3) The eddy current and X-ray diffraction tests were sensitive to the micro structural changes during long=term heating. Thus, it is possible to use them as a method of non-destructive evaluation of material deterioration such as embrittlement appearing before softening.
社団法人日本材料学会の論文
1981-03-15