1445 過渡的な温度条件下の熱応力に及ぼす材料微視組織の影響(S15-5 プラント材料組織,物性と熱応力,S15 熱応力,応力特異性と強度評価)

抄録

Effects of microstructures and a transient temperature change on the microcracking of both cemented carbides and cermets were analyzed using a simulation method with a triangular elastic spring-lattice model. The transient temperature change was determined to fit the results of the improved thermal shock test which was proposed by Ishihara et al. The simulation results show that the initiations of a microcrack were observed at earlier stages of the transient temperature change for the models of both cemented carbides and cermets. Then, the successive occurrences of the microcracking were strongly affected by the microstructures. In the case of the large number of microcracks, the final number of microcracks for the transient calculation was different from one of a single step calculation.