PS26 マイクロ・スパーク・コーティングしたNI基超合金材のき裂発生と高温疲労強度(フェロー賞対象ポスターセッション)

概要

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High temperature fatigue (HCF) properties of the A11oy718 superalloy specimens to aich a Co-based wear resisting alloy was coated by the Micro Spark Coating (MSC) method, were investigated at two elevated temperature, 480℃ and 650℃, respectively. It was revealed that the HCF life of coated specimen was slightly shorter than the life of bare specimen at 480℃. On the other hand, the HCF lives were longer at 650℃. The most of fracture surface were placed on the end of coating region in gage part at both temperatures. Form the elastic analysis using finite element method, the stress concentration had been occurred in the end of coating region. It was suggested that high temperature fatigue properties were influenced by two phenomena: one was the stress concentration that was based on the shape and mechanical properties of the MSC layer; and the other was a load transfer capability of the coated area, dependent on the test temperature and exposure time.
2010-10-09