Dissimilar-weld failure analysis and development program: Volume 3, Accelerated discriminatory tests: Final report

Technical Report · Sat Nov 01 00:00:00 EST 1986

OSTI ID:7048943

Prager, M

This volume of the report on research project RP1874 describes the results of studies to develop an accelerated discriminatory test for evaluation of dissimilar metal welds (DMWs) typical of those found in boiler superheater and reheater tubing. The weldments of interest are generally those between 2-1/4 Cr - 1 Mo low-alloy steel and 300-series stainless steel, including those made by the induction-pressure-welding process, those made with austenitic stainless-steel filler metal, and those made with nickel-base filler metal. The overall objective of the testing was to reproduce, in the laboratory, the types of failure observed in this class of weldments in fossil boiler service. The failures generally occur in the low-alloy steel immediately adjacent to, or along, the weld fusion line. Characteristically, failure is by relatively low-ductility cracking that exhibits characteristics suggesting that creep plays a dominant role in the failure process. As a result of the test program, two types of discriminatory tests were developed. One applies relatively small loads to DMWs made with annealed 2-1/4 Cr - 1 Mo with or without preaging. The other applies relatively high loads to DMWs made with normalized and tempered 2-1/4 Cr - 1 Mo and not preaged. Both test types produce service-like failures and indicate relative performances consistent with service observations. 45 refs., 181 figs., 29 tabs.

• Research Organization: Metal Properties Council, Inc., New York (USA)
• OSTI ID: 7048943
• Report Number(s): EPRI-CS-4252-Vol.3; ON: TI87920105
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
36 MATERIALS SCIENCE
BOILERS
WELDED JOINTS
FOSSIL-FUEL POWER PLANTS
SUPERHEATERS
MECHANICAL TESTS
TESTING
AUSTENITIC STEELS
BENDING
CHROMIUM-MOLYBDENUM STEELS
CRACKS
CREEP
EXPERIMENTAL DATA
FAILURE MODE ANALYSIS
FERRITIC STEELS
FILLER METALS
FRACTURE PROPERTIES
METALLOGRAPHY
SERVICE LIFE
STAINLESS STEELS
STEELS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
THERMAL STRESSES
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION RESISTANT ALLOYS
DATA
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS TESTING
MECHANICAL PROPERTIES
NUMERICAL DATA
POWER PLANTS
STRESSES
SYSTEM FAILURE ANALYSIS
SYSTEMS ANALYSIS
THERMAL POWER PLANTS
200101* - Fossil-Fueled Power Plants- Cooling & Heat Transfer Equipment & Systems
360101 - Metals & Alloys- Preparation & Fabrication