The microstructure and tensile properties of nitrogen containing vacuum atomized Alloy 690

Technical Report · Fri Feb 01 00:00:00 EST 1991

OSTI ID:6000683

Fuchs, G E; Hayden, S Z

The mechanical properties and microstructure of a heat of nitrogen containing vacuum atomized A690 have been characterized. Although wrought A690 exhibits extensive grain growth during solution annealing heat treatments, only limited grain growth was observed in P/M690N{sub 2}. The presence of the nitrogen in the P/M690N{sub 2} resulted in the formation of a fine dispersion of Ti(C,N) which limited grain growth during elevated temperature exposures. The yield and ultimate tensile strength of the P/M690N{sub 2} was significantly greater than wrought A690 and elevated temperature exposures did not greatly affect the properties of the P/M690N{sub 2}. Although the P/M690N{sub 2} did exhibit appreciably higher strengths than wrought A690, the ductility was not adversely affected. In general, the resulting microstructure and, hence, mechanical properties of the P/M690N{sub 2} were very stable, uniform, and reproducible, even after long-term elevated temperature exposures of up to 24 hours at 1100{degree}C. 14 refs., 5 figs., 1 tab.

• Research Organization: Knolls Atomic Power Lab., Schenectady, NY (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC12-76SN00052
• OSTI ID: 6000683
• Report Number(s): KAPL-4722; ON: DE91010695
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NICKEL BASE ALLOYS
MICROSTRUCTURE
TENSILE PROPERTIES
ANNEALING
ATOMIZATION
CARBON
GRAIN GROWTH
METALLURGICAL EFFECTS
NITROGEN
TITANIUM
ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
HEAT TREATMENTS
MECHANICAL PROPERTIES
METALS
NICKEL ALLOYS
NONMETALS
TRANSITION ELEMENTS
360102* - Metals & Alloys- Structure & Phase Studies
360103 - Metals & Alloys- Mechanical Properties