Development of cobalt-free hard-facing alloys for nuclear applications: 1984 progress
Cobalt-free hardfacing alloys are needed to replace cobalt-base Alloy No. 6, used in nuclear valves, in order to reduce the radiation exposure of service personnel that is associated with cobalt 60. An analysis of the property requirements of nuclear hardfacing materials indicates that galling resistance is a critical property which is generally not associated with cobalt-free alloys. A series of cobalt-free alloys was selected for evaluation based on the available knowledge of wear and galling behavior of austenitic iron-base alloys. The experimental alloys were evaluated for galling resistance and for adhesive wear resistance in a crossed cylinder wear test in both air and deionized water environments at room ambient temperature. Tensile, impact, hardness and weldability properties of the alloys were also evaluated. An iron-base alloy has been identified with galling resistance properties equivalent to those of the Alloy No. 6 in tests in deionized water and in tests in air at loads up to 275 MPa (40 ksi). The effects of variations in Mn, Si, Ni and N contents on the wear, mechanical, and welding properties, and on the alloy microstructure have been determined. Galling tests have also been performed on many commercially produced low-cobalt and cobalt-free alloy hardfacings as well as laser remelted Alloy No. 156. 34 refs., 12 figs., 22 tabs.
- Research Organization:
- AMAX Materials Research Center, Ann Arbor, MI (USA)
- OSTI ID:
- 6496962
- Report Number(s):
- EPRI-NP-4237; ON: TI85920879
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
AUSTENITIC STEELS
HARD FACING
WEAR
WELDABILITY
CONTROL ROD DRIVES
VALVES
BUILDUP
CORROSION RESISTANCE
MANGANESE
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NICKEL
NITROGEN
RADIATION PROTECTION
SILICON
ALLOYS
CONTROL EQUIPMENT
ELEMENTS
EQUIPMENT
FLOW REGULATORS
IRON ALLOYS
IRON BASE ALLOYS
METALS
NONMETALS
REACTOR COMPONENTS
SEMIMETALS
STEELS
TRANSITION ELEMENTS
220200* - Nuclear Reactor Technology- Components & Accessories
360103 - Metals & Alloys- Mechanical Properties