Abstract
After 1221 h of bench testing, linear fluorescent displays were observed on the transition arcs between the blade and the edge plate. Macroscopic and microscopic inspections revealed fatigue cracks originating from cracked grain boundaries on the surface. Metallographic examinations indicated severe oxidation of the crack flank and blunting tip. Finite element thermal stress analysis aligns with the crack distribution. The nature of the cracking is identified as thermal mechanical fatigue, and the elevated temperature gradient induced by the exhaust gas purification device is the main promoter for cracking. Comparative analysis suggests that the root cause lies in the low thermal impact resistance of the material, ultimately resulting in reduced thermal mechanical fatigue resistance. Corresponding remedial methods are proposed to enhance service life and safety.
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