Abstract
This chapter describes microstructures in some relatively new maraging steels. A great deal of precipitates with diameters of a few nanometres are formed in the early ageing stage. Ni 3 Ti precipitates grow into needle or rod shapes and become the main precipitation as the ageing time is prolonged. Under higher temperature ageing, the size of precipitates is seriously non-uniform during the early stages and a small amount of inter-lath reverted austenite is formed. Thereafter, precipitates coarsen sharply. Intra-lath reverted austenite appears subsequently. In later stages of ageing, the coarsened Ni 3 Ti precipitates dissolve into strip-like intra-lath reverted austenite which is disorderly embedded in the matrix.
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