CHARPY-V TRANSITION TEMPERATURES OF FERRITIC IRON ALLOYS. PART II. IRON- CHROMIUM AND IRON-CHROMIUM-ALUMINUM

Technical Report · Mon Aug 24 04:00:00 EDT 1959

OSTI ID:4204469

Srawley, J E

BS>The Charpy-V mid-energy transition temperatures of a series of iron- chromium alloys containing up to 24.3% chromium, and of three series of iron-- chromium--aluminum alloys containing up to 25% chromium and 6% aluminum, have been determined for several conditions of mechanical working and heat treatment. The fracture mode of specimens broken below the transition temperature wss invariably transgranular. The transition temperatures of the iron- chromium alloys decreased with increasing chromium content when the alloys had been quenched from 1650 deg F, and increased with increasing chromium content when the alloys were slowly cooled from 1650 deg F. The effects are not readily explained by the known embrittling mechanisms: 885 deg F embrittlement and sigma-phase embrittlement. Alloys contuining about 0.5% aluminum had significantly lower transition temperatures than corresponding alloys without aluminum. Alloys containing about 5% aluminum had higher transition temperatures than those without aluminum. Manganese contents of up to 12.5% appeared to have no beneficial effect on the transition temperatures of the ironchromium- aluminum alloys, and titanium contents up to 1.92% raised the transition temperature. (auth)

• Research Organization: Naval Research Lab., Washington, D.C.
• NSA Number: NSA-13-022417
• OSTI ID: 4204469
• Report Number(s): NRL-5367
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM ALLOYS
BRITTLENESS
CHROMIUM ALLOYS
COLD WORKING
FAILURES
HEAT TREATMENTS
IRON ALLOYS
MECHANICAL PROPERTIES
METALLURGY AND CERAMICS
QUANTITY RATIO
TEMPERATURE
TITANIUM ALLOYS
TRANSITION TEMPERATURE