セラミック溶射Cr-Mo鋼の低サイクル疲労寿命

概要

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Low cycle fatigue tests were performed at RT and elevated (673K) temperatures for ceramic sprayed 1%Cr-0.5%Mo steels.The fatigue properties of ceramic-sprayed steels and the mechanism of fatigue-fracture were discussed.The main results obtained are as follows.(1) The fatigue life of the ceramic-sprayed steel at 673K was slightly longer than the life at RT,while it was shorter than those of the base meral at RT and elevated temperatures.(2) The crack initiation in the ceramic layer occurred at a significantly eatly stage of fatigue of the coated steel.As the strain range became smaller,the crack initiation life of the ceramic layer become longer.(3)The fatigue-fracture process of the coated steel is considered as follows.At an early stage of fatigue,a fatigue crack is initiated at the surface of the ceramic layer and propagates quickly to the meral layer.The propagating fatigue crack through the ceramic layer continues to grow into the substrate.
社団法人日本材料学会の論文
1993-09-15