Evaluation of 2 1/4 Cr-1 Mo steel for liquid lithium containment. II. Effects of post-weld heat treatment and niobium content. Annual report, 1979
The lithium corrosion resistance of the regular grade of 2 1/4 Cr-1 Mo steel can be vastly improved with a proper postweld heat treatment, but even greater improvements are needed. Results indicate that if weldments were tempered sufficiently long at 760C to remove all Mo/sub 2/C from the microstructure, even greater resistance to attack by low nitrogen lithium could be achieved. Corrosion tests should eventually be performed on regular grade 2 1/4 Cr-1 Mo steel weldments which have been given a long-term (> 25 h) post-weld temper at 760C. Lithium corrosion resistance of regular grade 2 1/4 Cr-1 Mo steel may also be improved by employing a quench and temper heat treatment. Quenched microstructures have more homogenous distribution of carbides than isothermally annealed microstructures, and if properly tempered, should provide excellent lithium corrosion resistance. Furthermore, the toughness of such a lower bainite microstructure should be better than that of the ferrite-bainitic microstructure created by an isothermal anneal. Numerous parameters, all potentially deleterious to the lithium corrosion resistance of 2 1/4 Cr-1 Mo steel, remain to be investigated; two such variables are velocity effects and lead content in the lithium.
- Research Organization:
- Colorado School of Mines, Golden (USA). Dept. of Metallurgial Engineering
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6695155
- Report Number(s):
- UCRL-15313; TRN: 81-003890
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM-MOLYBDENUM STEELS
CORROSION RESISTANCE
LITHIUM
CORROSIVE EFFECTS
FRACTURE PROPERTIES
HEAT TREATMENTS
LIQUID METALS
MICROSTRUCTURE
QUENCHING
TEMPERING
WELDED JOINTS
ALKALI METALS
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CRYSTAL STRUCTURE
ELEMENTS
FLUIDS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
LIQUIDS
MECHANICAL PROPERTIES
METALS
STEELS
360105* - Metals & Alloys- Corrosion & Erosion