Influence of thermal aging (to 50,000 h) on the tensile properties of modified 9Cr-1Mo steel

Technical Report · Sat Jul 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/714624· OSTI ID:714624

Brinkman, C R; Baldwin, R H

Results of room- and elevated-temperature tensile tests are reported from tests conducted on three heats of Modified 9Cr-1Mo steel. The heats were thermally aged at various temperatures from 482 to 704{degree}C and at aging time to 50,000 h. Tensile strain rates were also varied in order to determine strain rate sensitivity of tensile properties. Changes in the yield and tensile strengths occurred following exposure to these temperatures with decreases noted at the higher temperatures. The material showed a strain-rate sensitivity particularly at temperatures in excess of about 538{degree}C due to the presence of what was believed to be strain aging. The tensile-strength data were parameterized in order to permit estimates of changes in both the room- and elevated-temperature properties to be made following exposure for prolonged periods in service. Estimates are given of the changes in yield and tensile strengths following isothermal exposure a several temperatures for 60 yeas of service time. Comparisons are also made between estimated degradation in short-term properties of Modified 9Cr-1Mo steel and several other materials due to thermal aging. 5 refs., 11 figs., 5 tabs.

• Research Organization: Oak Ridge National Lab., TN (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 714624
• Report Number(s): ORNL/TM--11223; ON: TI89021428
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGING
CHEMICAL COMPOSITION
CHROMIUM-MOLYBDENUM STEELS
HEAT TREATMENTS
STRAIN RATE
TENSILE PROPERTIES
YIELD STRENGTH