THE PARTITIONING OF ALLOYING ELEMENTS IN MALLEABLE IRONS
The partitioning of a number of alloying elements between the cementite and austenite phases of irons during first-stage graphitization has been determined. For the most part, the data were obtained by chemical analyses of the cementite chemically extracted from irons quenched after selected periods at l650 F. Spot checks of these results and some explorations of alloy distribution in the matrix were made with the electron probe microanalyzer. The results show that the elements V, Cr, Mo, and Mn (not combined with S) concentrate in the cementite phase and may further enrich in this phase during graphitization. Small but measurable amounts of the elements Si, Cu, Ni, Co, and Al are also found in the cementite phase. Sulfur dissolves partially in the cementite phase but is removed insofar as MnS is formed. The finding of significant amounts of every alloying element investigated in the cementite phase suggests that the mechanism by which alloying elements influenee graphitization kinetics may involve a change in the thermodynamic stability of the cementite phase. (auth)
- Research Organization:
- Naval Research Lab., Washington, D.C.
- NSA Number:
- NSA-13-011181
- OSTI ID:
- 4279296
- Report Number(s):
- NRL-5268
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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Related Subjects
AUSTENITE
CEMENTITE
CHROMIUM
COBALT
COPPER
DISTRIBUTION
ELEMENTS
GRAPHITE
HEAT TREATMENTS
HIGH TEMPERATURE
IRON ALLOYS
MANGANESE
MANGANESE SULFIDES
METALLURGY AND CERAMICS
MOLYBDENUM
NICKEL
PHASE DIAGRAMS
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
QUENCHING
REACTION KINETICS
SILICON
SOLUBILITY
SULFUR
THERMODYNAMICS
TRACE AMOUNTS
VANADIUM