Microstructural control to improve the properties of chromium-molybdenum weld metal. Final technical report, October 1, 1983-October 30, 1984

Technical Report · Sun Mar 10 00:00:00 EST 1985

OSTI ID:5323677

Pickering, Jr, E W

The objective of this work was to formulate and produce a variety of welding consumables for the purpose of determining the effects of compositional and process variables on the microstructure and mechanical properties of shielded metal arc (SMA) weld metal of advanced Cr-Mo steels. Composition variables included the effect of slag basicity and oxygen potential as well as the effect of alloying elements. Welding variables included heat input, preheat and interpass temperature, and post weld heat treatments. Primary work centered on development, and supplying welding consumables, welding of test plates and related testing at both Combustion Engineering (C-E) and the Oak Ridge National Laboratory (ORNL). In addition, two experimental heats of 3Cr-1.5Mo were laboratory manufactured for use by other contractors on the Advanced Fossil Energy Materials Research and Technology Development Program. This report summarizes the work accomplished during the contract period. Electrodes were produced for 3Cr-1.5Mo-V steel with three levels of C and V, and SMA weldments were made in 1-in. thick plates. After a 6-h post weld heat treatment at 700/sup 0/C the electrode producing the highest deposited C and V (0.1% for each) showed the best strength and impact properties. Additional SMA welds produced with nominal 0.1% C and 0.1% V were tested to examine the influence of post weld heat treatment on strength and Charpy-V impact. These data showed that 3Cr-1.5Mo-V steel can be readily welded by the SMA process and that good strength and toughness will result after post-weld heat treatments in the temperature range 663 to 700/sup 0/C. Compositions were identified that resulted in improved useability and Charpy V-notch values. 4 figs., 21 tabs.

• Research Organization: Combustion Engineering, Inc., Chattanooga, TN (USA). Metallurgical and Materials Lab.
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5323677
• Report Number(s): DOE/OR/21400-T169; CEMML-64760-13; ON: DE85016179
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM-MOLYBDENUM STEELS
CHARPY TEST
TENSILE PROPERTIES
WELDING
CARBON ADDITIONS
ELECTRODES
EXPERIMENTAL DATA
FABRICATION
HEAT TREATMENTS
HIGH TEMPERATURE
VANADIUM ADDITIONS
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
DATA
DESTRUCTIVE TESTING
IMPACT TESTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
NUMERICAL DATA
STEELS
TESTING
VANADIUM ALLOYS
360101* - Metals & Alloys- Preparation & Fabrication
360103 - Metals & Alloys- Mechanical Properties