Creep-Fatigue Damage Analysis on PR-Strained Stainless Steel Type 321 by Tube Working in an Operating Boiler

摘要

The power boiler tube (ASTM Type 321) at thebending part failed by creep-fatigue due to start-up and shut-down thermal stresses. For the remaining 111 identical parts,the residual life had to be assessed with damage analysis basedon fatigue, creep and creep-fatigue properties investigated onpre-strained material. The damage evaluation method includedinspecting the microstructures led to the discovery of smallinitial fatigue cracks in the samples due to repair work. It canbe defined the possibility of failure tube by damage analysisand a few samples inspecting.