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. Ni3Ti 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 Ni3Ti precipitates dissolve into strip-like intra-lath reverted austenite which is disorderly embedded in the matrix.
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