Analysis of weldment mechanical properties of modified 9 Cr-1 Mo steel
The status of welding and weldability studies on modified 9 Cr-1 Mo steel is presented, and microhardness, tensile, creep, and Charpy impact properties of welds made by gas tungsten arc, shielded metal arc, and submerged arc processes are analyzed. Microhardness traverses of modified 9 Cr-1 Mo welds were examined after nominal and extended postweld heat treatments. Microhardness data on modified 9 Cr-1 Mo were also compared with similar results on standard 9 Cr-1 Mo, 2 1/4 Cr-1 Mo, and HT9. Tensile and creep data were primarily on weldment specimens in which the gage length contained the base metal, weld metal, and heat-affected zone. Charpy impact data were primarily on the weld metal, with notch parallel to the welding direction. On the basis of the data presented, it is concluded that standard 9 Cr-1 Mo wire and electrodes can be used to weld modified 9 Cr-1 Mo base metal if welds are given a nominal postweld heat treatment. If welds are to be normalized and tempered, the use of modified wire and electrodes having the base metal composition is recommended.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5498885
- Report Number(s):
- ORNL/TM-9045; ON: DE85012618
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHARPY TEST
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CREEP
DATA
DESTRUCTIVE TESTING
HARDNESS
IMPACT TESTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROHARDNESS
NUMERICAL DATA
STEELS
TENSILE PROPERTIES
TESTING
WELDABILITY
WELDED JOINTS