Effect of Aging Treatment on Microstructure and Mechanical Properties of a Ultra-high Strength Maraging Stainless Steel

The effects of aging treatment on microstructure and mechanical properties of a low carbon ultra-high strength maraging stainless steel after solid solution and cryogenic treatment were studied.The ultimate tensile strength and hardenss of the steel reach to the maximum values after aging at 535℃ due to the precipitation of coherent phase.The strength and hardness of the steel aged at temperature higher than 535℃ decrease due to the coarsening of the precipitates and the destruction of its coherent relationship with matrix.