High-strength austenitic alloys for generator retaining rings. Interim report

Technical Report · Wed Apr 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6476413· OSTI ID:6476413

Chang, K. M.; Morris, Jr., J. W.; Thomas, G.

This document reports on research intended to produce a new high strength austenitic alloy suitable for use in generator retaining rings. Program requirements set the criteria that the alloy should have a yield strength about 200 ksi a fracture toughness greater than 100 ksi ..sqrt..in, and resistance to stress corrosion cracking in hydrogen and salt water. The alloy was also required to be nonmagnetic and to achieve its properties through heat treatment rather than mechanical work to permit its manufacture in domestic facilities. These requirements were met through the development of an alloy, designated EPRI-T, which has nominal composition Fe-34.5Ni-5Cr-3Ti-3Ta-0.5Al-1Mo-0.3V-0.01B. EPRI-T is an iron-based superalloy which hardens through the formation of cubic ..gamma..' precipitate on aging. After forging and suitable double aging it develops a yield strength of 200 ksi with a fracture toughness 100 ksi..sqrt..in, and shows substantial resistance to hydrogen embrittlement and to stress-corrosion cracking in salt water. An additional series of alloys, designated EPRI-M, were also developed to permit the attainment of higher yield strengths but have lower fracture toughness than is attainable in alloy T.

• Research Organization: California Univ., Berkeley (USA); Lawrence Berkeley Lab., CA (USA)
• OSTI ID: 6476413
• Report Number(s): EPRI-CS-1808
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
200100* -- Fossil-Fueled Power Plants-- Power Plants & Power Generation
36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
CHEMICAL REACTIONS
CORROSION
CORROSION RESISTANCE
ELECTRIC GENERATORS
HARDENING
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
RINGS
STRESS CORROSION