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Metallurgy

MP35N is one of a series of Multiphase Alloys. They are face-centered-cubic in the annealed condition, and have a microstructure similar to that of austenitic stainless steel. However, when cold worked, as in the drawing of wire, the microstructure changes so that part of the austenite transforms to a hexagonal close-packed phase. The phase transformation, fcc --» hcp, causes an increase in the strength of the wire. Further drawing causes additional is formation and additional strengthening. Additional strengthening can be obtained when a cold-worked structure is subjected to an elevated temperature aging treatment. Aging treatments in the range of 800 to 1200°F for times from 1 to 4 hours result in higher tensile and yield strengths along with reduced levels of ductility.

Typical microstructures are shown for wire in the annealed and cold-worked conditions. The annealed microstructure, Figure 7, shows a uniform fee microstructure with essentially no second phase particles due to the high purity and double-vacuum melt procedure used to manufacture the alloy. These features are maintained in the processing to fine wire, and contribute to the outstanding performance of the material.

The cold-worked structure of a drawn wire is shown in Figure 8, in which the hcp strengthening phase becomes evident The presence of the aged structure cannot be detected by light microscopy, and special techniques are required to delineate its presence.

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