Long-term creep-rupture behavior of modified 9Cr-1Mo steel base and weldment behavior
- Oak Ridge National Laboratory (ORNL)
Results are reported of long-term creep and creep-rupture tests from ongoing and completed tests conducted on modified 9Cr-1Mo steel in the normalized and tempered condition and its weldments. Test data are reported over the temperature range of 427 to 704{sup 0}C obtained from multiple heats of wrought and cast material. Stress-rupture and creep data are given from tests on base material with test times to about 68,000 h (7.8 years to April 1987). Comparisons are made between long-term experimental data and predictions made with creep and rupture equations developed in 1984. Also given are results from rupture tests on specimens taken from weldments. These specimens were either all weld metal or taken transverse across a weldment such that the gage length contained weld, heat-affected-zone, and base material. Weldment materials were given either a standard or modified heat treatment. The objective of the modified heat treatment was to minimize a slightly weak or soft area in the heat-affected zone. Creep-rupture data indicate that the modified heat treatment improves the rupture behavior of weldments of this material.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 713976
- Report Number(s):
- ORNL/TM-10504
- Country of Publication:
- United States
- Language:
- English
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