Maraging steel

About: Maraging steel is a research topic. Over the lifetime, 1728 publications have been published within this topic receiving 19886 citations. The topic is also known as: martensitic ageing steel.

Effect of stress relief on microstructure and mechanical properties of flow formed maraging steel weldment by electron beam welding

Abstract: The technique of forward flow forming has been used to produce a long and thin wall tube of C-250 maraging steel The work hardening effect of solution treated C-250 by flow forming is small Therefore aging treatment after flow forming is required to increase hardness and strength Final formed C-250 tubes are usually manufactured by combining aging treatment and electron beam welding (EBW) The hardness and tensile strength of aged C-250 maraging steel weldment decreased to the corresponding values obtained in the solution annealed state Thus, the formed tube by EBW requires stress relieving treatment (and similarly for theaged condition) to increase hardness and strength and thus meet the required specification The strength requirement was successfully achieved but the elongation of the aged, EBW, and stress relieved specimen was 885% lower than that of the unwelded specimen

Influence of shielding gas nitrogen content on the microstructure and mechanical properties of Cu-reinforced maraging steel fabricated by wire arc additive manufacturing

Abstract: This study investigated the effects of using shielding gases with different nitrogen concentrations on the microstructures and mechanical properties of SHER-120G maraging steel fabricated by wire arc additive manufacturing (WAAM). With increases in the nitrogen concentration, the contents of nitrogen and austenite in the bulk specimens increased significantly, while δ-ferrite formation was inhibited. In addition, nitrogen was absorbed by the molten pool and decomposed into N atoms during WAAM. Some N atoms formed a solid solution with the matrix and the rest reacted with Cr to form Cr2N, which plays an important role in the process of martensite lath refinement. The optimal shielding gas composition was 94% Ar + 2% O2 + 4% N2, which resulted in a tensile strength and micro-hardness of 1324 MPa and 441 HV, respectively. These values are 12.3% and 12.5% higher, respectively, than those of samples fabricated without nitrogen in the shielding gas.

Modeling the Titanium Nitride (TiN) Germination and Growth during the Solidification of a Maraging Steel

Abstract: A maraging steel containing nitrogen and titanium is considered. As solidification proceeds, the segregation accounts for an increase of Ti and N mass fraction in the liquid phase. This eventually leads to the formation of TiN if the supersaturation is high enough. A model has been developed to calculate the creation and evolution of the TiN distributions in both phases. Microsegregation is modeled using the lever rule, while the kinetics of precipitation is mainly driven by the supersaturation of the liquid bath. The model enables one to investigate the competition between segregation and precipitation regarding the solute concentrations and the shape of the particle size distributions in the liquid and solid phases. A parametric study on the solidification time reveals the existence of a maximal inclusion size. It also confirms the influence of the initial composition on the final size of TiN particles.

Strong,tough,corrosion resistant maraging steel

Abstract: A MARGAGING STAINLESS STEEL CONTAINS CHROMIUM, MOLYBDENUM, NICKEL, ALUMINUM AND/OR TITANIUM, AND CARBON AS ESSENTIAL CONSTITUENTS, THE ALUMINUM AND TITANIUM BEING SPECIALLY CONTROLLED. A SPECIAL RELATIONSHIP IS GIVEN IN RESPECT OF THE ELEMENTS CHROMIUM, MOLYBDENUM, AND NICKEL WHEREBY VARIOUS PROCESSING TREATMENTS ARE RENDERED UNNECESSARY. THE STEELS ARE USEFUL IN THE PRODUCTION OF PRESSURE VESSELS AND AN ILLUSTRATIVE STEEL CONTAINS ABOUT 11% CHROMIUM, 2% MOLYBDENUM, 10% NICKEL, 0.25% ALUMINUM, 0.2% TITANIUM, UP TO 0.02% CARBON, THE BALANCE BEING PRINCIPALLY IRON.