Qualification loop tests of cobalt-free hardfacing alloys. [NOREM 01, NOREM 04, Ever it 50, EB 5183 and Stellite 6 Alloys]
- Atomic Energy of Canada Ltd., Sheridan Park, ON (Canada). CANDU Operations
AECL is conducting endurance tests on valves hard-faced with four cobalt-free alloys. The first phase of the program, in which PWR primary heat transport conditions were simulated in AECL's valve test loop, has reached the 1400 cycle mark. This represents approximately 70% of the target value of 2000 cycles. The candidate alloys are NOREM 01, NOREM 04, EB 5183 and EVERIT 50. One valve with Stellite 6 trim serves as the standard. Prior to loop testing, a baseline inaugural inspection was performed. During testing the loop was shut down at approximately 500 cycle intervals, and the valves were disassembled for examination. The examinations included seat leak tests, profilometry and nondestructive inspection. Corrosion coupons in the loop were used to monitor any material loss due solely to corrosion mechanisms. This interim progress report summarizes the examination results and the relative performance of the candidate alloys. The results to date indicate that, based upon the sliding were damage assessment and seat leakage test results, all the candidate alloys perform better than the Stellite 6 control sample. On the same basis, NOREM 04 and EB 5183 are the best of the candidate alloys; although there are only minor differences in performance among the four alloys at this time. A final assessment can only be made after the cycling tests are complete and the seats and discs have been destructively examined. 3 refs., 31 figs., 9 tabs.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (USA); Atomic Energy of Canada Ltd., Sheridan Park, ON (Canada). CANDU Operations
- Sponsoring Organization:
- EPRI
- OSTI ID:
- 6493362
- Report Number(s):
- EPRI-NP-7030-D
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOY-CO60CR30W4
ALLOYS
CARBON
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COBALT
COBALT ALLOYS
COBALT BASE ALLOYS
CONTROL EQUIPMENT
COOLING SYSTEMS
CORROSION
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DOCUMENT TYPES
ELEMENTS
ENERGY SYSTEMS
EQUIPMENT
FABRICATION
FLOW REGULATORS
HARDENING
HAYNES ALLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INSPECTION
IRON
IRON ALLOYS
JOINING
JOINTS
MANGANESE
MATERIALS
METALS
MICROSTRUCTURE
MOLYBDENUM
NICKEL
NICKEL ALLOYS
NIOBIUM
NONMETALS
PERFORMANCE TESTING
PRIMARY COOLANT CIRCUITS
PROGRESS REPORT
PWR TYPE REACTORS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
SEMIMETALS
SILICON
STELLITE
STELLITE 6
SURFACE HARDENING
SURFACE TREATMENTS
TESTING
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN ALLOYS
VALVES
WATER COOLED REACTORS
WATER MODERATED REACTORS
WEAR
WELDED JOINTS
WELDING