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A high strength steel with an austenite-martensite duplex microstructure has been produced by extruding nickel coated steel powder. The austenite is stable and is present as a continuous network surrounding a high strength martensite. The dual-phase steel exhibits superior resistance to stress corrosion cracking in 3.5 pct NaCl solution, compared with steels of similar strength having conventional microstructures. Also, the effectiveness of the austenite in improving stress corrosion cracking resistance increases as the yield strength increases. The austenite, because of its inherent toughness, reduces the effective stress intensity at the advancing crack tip, and at the same time shields the crack tip from the corrosive environment.

Enhanced stress corrosion resistance from steels having a dual-phase austenite-martensite microstructure