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.

Investigation on the cracking resistances of different ageing treated 18Ni maraging steels

Abstract: The cracking resistance is an important indicator concerned by the industry. In this study, the cracking resistances (impact toughness, fracture toughness and fatigue crack growth resistance) of different ageing treated 18Ni maraging steels were investigated. Meanwhile, the differences in microstructures and fractographies were compared. Finally, the key factors affecting the cracking resistances were discussed and confirmed. It is found that, with the increment in ageing temperature, the size and spacing of precipitated phases would augment, as well as, the impact and fracture toughness, and fatigue crack growth resistance would improve. The fracture morphologies of impact and fracture toughness specimens display that, with the improvement of toughness, the size of dimple would gradually upgrade, and the characteristic of cleavage fracture would gradually disappear. The key factor influencing the cracking resistances of maraging steel is the interparticle spacing. Augmenting the interparticle spacing would cause the improvement of cracking resistances for maraging steel.

Mechanical Properties of 3D-Printed Maraging Steel Induced by Environmental Exposure

Abstract: Changes in the mechanical properties of selective laser melted maraging steel 300 induced by exposure to a simulated marine environment were investigated. Maraging steel samples were printed in three orientations: vertical (V), 45° (45), and horizontal (H) relative to the print bed. These were tested as-printed or after heat-treatment (490 °C, 600 °C, or 900 °C). One set of specimens were exposed in a salt spray chamber for 500 h and then compared to unexposed samples. Environmental attack induced changes in the microstructural features and composition were analyzed by scanning electron microscopy and energy dispersive spectroscopy respectively. Samples printed in the H and 45° directions exhibited higher tensile strength than those printed in the V direction. Corrosion induced reduction in strength and hardness was more severe in specimens heat-treated between 480 °C and 600 °C versus as-printed samples. The greatest decrease in tensile strength was observed for the 45°-printed heat-treated samples after exposure. A comparison between additive and subtractive manufactured maraging steel is presented.

Source book on maraging steels: A comprehensive collection of outstanding articles from the periodical and reference literature

Abstract: Source book on maraging steels: a comprehensive collection of outstanding articles from the periodical and reference literature , Source book on maraging steels: a comprehensive collection of outstanding articles from the periodic... , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

Effect of prestressing on the stress-corrosion resistance of two high-strength steels

Abstract: : Precracked, single-edge-notched specimens of 4340 steel (194-ksi yield strength) and 18% Ni maraging 300 steel were prestressed in laboratory air to various percentages (0% to 90%) of K sub Ic and then unloaded. The times to failure were subsequently determined in 3.5% aqueous NaCl solution as a function of initial stress intensity. Prestressing increased the threshold stress intensity K sub Iscc of the 4340 steel, but had only a slight effect on the K sub Iscc of the maraging steel. The times to failure of both steels at initial stress-intensity levels above K sub Iscc were unaffected by prestress. The prestressing effects are attributed to the presence of compressive stresses at the crack tip.