Fatigue cracking of coextruded 304L/CS tubes

Technical Report · Sun Mar 01 04:00:00 EST 1998

DOI:https://doi.org/10.2172/672022· OSTI ID:672022

Swindeman, R W; Keiser, J R; Maziasz, P J ^[1]; Singbeil, D L ^[2]

---

1. Oak Ridge National Lab., TN (United States)
2. Pulp and Paper Research Inst. of Canada, Vancouver, British Columbia (Canada)

The mechanical and thermal fatigue of authentic stainless steels was examined for the maximum temperature range expected in coextruded floor tubes of recovery boilers to determine the likelihood that the cracking in the 304L stainless steel cladding could be fatigue related. The microstructures and cracking patterns of fatigue-tested specimens were compared to features observed in cracked cladding and significant differences were found which suggested that fatigue was not the most likely cause for failure. Biaxial thermal fatigue testing of coextruded tubes and panels was performed to gather more evidence of cracking patterns. Here, transient thermal stresses were imposed by rapidly heating the tubing surface with lamps. In spite of high surface temperatures, no cracks were produced in the 304L stainless steel cladding, and this observation was interpreted as evidence that cracking must be corrosion related.

• Research Organization: Oak Ridge National Lab., Metals and Ceramics Div., TN (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 672022
• Report Number(s): ORNL/CP--97557; CONF-980555--; ON: DE98004887; BR: ED1902000
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
BOILERS
CRACK PROPAGATION
EXPERIMENTAL DATA
FATIGUE
MICROSTRUCTURE
PAPER INDUSTRY
SPENT LIQUORS
STAINLESS STEEL-304L