Microstructural Characterization of a Cobalt-Free Maraging Steel, Vasco Max T-250
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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A cobalt-free maraging steel, Vasco Max t-250, is being used as a replacement for the conventional, 18 Ni 300 grade maraging steel used by the Army. The thrust of this programs was to characterized the microstructure of annealed and aged specimens using optical and electron microscopy and X-ray diffraction. The structure of the annealed sample is a heavily dislocated lath martensite. The aged sample are a lath martensite that contains very fine Ni3Ti second phase particles. The precipitates are coherent with the matrix and form in a Widmanstatten pattern. The Ni3Ti precipitates are a very effective strengthening phase of the Vasco Mas T-250 and the aging temperature that appears to optimize the strengthening precipitates is 950 F.
- Properties of Metals and Alloys