High strength, tough alloy steel

Patent · 31 December 1978

OSTI ID:863434

Thomas, Gareth ^[1]; Rao, Bangaru V. N. ^[2]

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1. Berkeley, CA
2. Albany, CA

A high strength, tough alloy steel is formed by heating the steel to a temperature in the austenite range (1000.degree.-1100.degree. C.) to form a homogeneous austenite phase and then cooling the steel to form a microstructure of uniformly dispersed dislocated martensite separated by continuous thin boundary films of stabilized retained austenite. The steel includes 0.2-0.35 weight % carbon, at least 1% and preferably 3-4.5% chromium, and at least one other substitutional alloying element, preferably manganese or nickel. The austenite film is stable to subsequent heat treatment as by tempering (below 300.degree. C.) and reforms to a stable film after austenite grain refinement.

• Research Organization: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
• DOE Contract Number: W-7405-ENG-48
• Assignee: Regents of University of California (Berkeley, CA)
• Patent Number(s): US 4170497
• OSTI ID: 863434
• Country of Publication: United States
• Language: English

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