AN INVESTIGATION OF THE CRACK PROPAGATION RESISTANCE OF HIGH-STRENGTH ALLOYS AND HEAT-RESISTANT ALLOYS. Bimonthly Progress Report No. 3 April 23, 1961 through June 23, 1961

Technical Report · Tue Jun 27 04:00:00 EDT 1961

OSTI ID:4807790

Jenkins, P C; Morrison, J D

In the evaluations of the Mo sheet materials, emphasis was placed on locating brittle-ductile transition temperatures. Both the Mo + 0.5% Ti and the TZM (Mo + 0.5% Ti + 0.08% Zr) alloys had a transition temperature at 65 deg F. The transition temperature for unalloyed molybdenum was 150 deg F. In the investigation of the tensile and crackpropagation properties of the Mo alloys at elevated temperatures, no pronounced effects attributable to strain aging were found for the unalloyed Mo or the Mo-0.5% Ti alloy. However, the 0.2%-offset yield strength showed a slight maximum and the ultimate tensile strength showed a marked maximum at 1000 deg F for the TZM material. This was also accompanied by a corresponding drop in net fracture stress at the same temperature. These effects are belleved to be definitely the result of a strain aging phenomenon. (auth)

• Research Organization: Southern Research Inst., Birmingham, Ala.
• NSA Number: NSA-16-012080
• OSTI ID: 4807790
• Report Number(s): AD-259795
• Country of Publication: United States
• Language: English

Related Subjects

ALLOYS
BRITTLENESS
CRACKS
DEFORMATION
DUCTILITY
FAILURES
HEAT RESISTING METALS
HEAT TREATMENTS
HIGH TEMPERATURE
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM
MOLYBDENUM ALLOYS
MOTION
PHASE DIAGRAMS
SHEETS
STABILITY
STRESSES
TEMPERATURE
TENSILE PROPERTIES
TITANIUM
TITANIUM ALLOYS
ZIRCONIUM
ZIRCONIUM ALLOYS