Abstract
Strength increases and fracture toughness decreases with the growth of precipitates. Strengthening in the underaged condition is a combination of dislocations cut through precipitates, and the Orowan mechanisms. Under peak-aged conditions, precipitates of moderate size are uniformly distributed in the martensite matrix, leading to optimal combination of strength and fracture toughness. The ultra-high strength of maraging steels subjected to long-term ageing is attributed to the high resistance to coarsening of the precipitates. The Orowan mechanism is the dominant strengthening mechanism. Towards the end of the chapter, there is a focus upon concentration of alloying elements, for example Mo, Ti and Cu.
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