Abstract
To clarify the effect of thermal-barrier spraying on the fatigue behavior of materials, low-cycle fatigue tests of thermal-barrier coated SUS304 stainless steel were performed under strain controlled condition at 973 K. Triangular strain waveform and tension or compression hold trapezoidal strain waveform were adopted. From the experimental results, decrease of fatigue of thermal-barrier-coated SUS304 was observed under triangular strain wave as compared with that of the base metal. On the other hand, fatigue life of the coated one under trapezoidal wave was same as that of the uncoated one. Difference of fatigue life between coated and uncoated material was explained by crack initiation behavior, which was obtained by A. C. potential method and observation by optical microscope. The number of cycles to crack initiation of coated specimen under triangular wave is smaller than that of uncoated one. On the other hand, crack initiation life of coated specimen is similar to uncoated one under trapezoidal waveform. Cracks initiated at the aluminum particles precipitated at the boundary between base metal and bonding layer. Also, it was discussed from the experimental results that the crack initiation and fatigue life were affected by the flaws on the ceramics layer formed during the spraying process.
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