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.

Heat Treatment Behavior of the 18Ni300 Maraging Steel Additively Manufactured by Selective Laser Melting

Abstract: The steel 18Ni300 is widely used for tooling of injection moulding and die casting industries. Additive manufacturing (AM) technology is applicable to manufacture dies with “ideal” design without construction of manufacturing reality. Selective laser melting (SLM) processed materials have finer microstructure due to steeper temperature gradient and more rapid cooling conditions than conventional casting process during solidification. This difference may make different heat treatment behavior in obtaining optimal properties of the 18Ni300 maraging steel manufactured by SLM. Heat treatment is one of the most processes to improve microstructure, mechanical properties and performance of tooling dies. This work studies evolution of microstructure and properties during heat treatment, by X-ray diffraction, optical and scanning electron microscopy (SEM). The results show that the SLMed materials with only aging treatment have comparable strengths and hardness to those of conventionally cast materials with both solution and aging treatment. For the SLMed materials, with increase of aging time and/or temperature, the formed reverted austenite (γ-Fe) fraction increases, while aging precipitation hardening decreases. This is more apparent at aging temperatures of higher than 540°C. The combined effects of softening by formation of reverted austenite (γ-Fe) and age hardening induced by precipitation are discussed.

Surface hardening treatment method for maraging steel and belt for belt type continuously variable transmission produced by the method

Abstract: The present invention provides a method for surface hardening a maraging steel and a belt for a belt-type continuously variable transmission, the surface of which is hardened by the method, which can improve the fatigue strength and wear resistance of the maraging steel. A method for hardening the surface of a maraging steel through aging treatment and nitriding treatment, wherein first, as a pretreatment of the nitriding treatment, oxidation treatment at 330 ° C. to 450 ° C. in an oxidizing atmosphere is performed. Oxidation is performed at a temperature and for an oxidation treatment time of less than 15 minutes to form an oxide layer that is mainly a layer of Fe 3 O 4 . Thereafter, nitriding is performed at a nitriding temperature of 430 ° C. to 480 ° C. in a nitriding atmosphere to form a nitride layer. [Selection diagram] Fig. 1

Formation of the Mechanical Properties and Fracture Resistance Characteristics of Sandwich Composites Based on the 09g2s Steel and the Ep678 High-Strength Steel of Various Dispersion

Abstract: Gladkovsky S.V. et al. / Formation of the mechanical properties and fracture resistance characteristics of sandwich composites based on the 09G2S steel and the EP678 high-strength steel of various dispersion http://dream-journal.org page 71÷90 FORMATION OF THE MECHANICAL PROPERTIES AND FRACTURE RESISTANCE CHARACTERISTICS OF SANDWICH COMPOSITES BASED ON THE 09G2S STEEL AND THE EP678 HIGH-STRENGTH STEEL OF VARIOUS DISPERSION

Influence of annealing on texture and magnetic properties of 18% nickel, 2400 MN m−2grade maraging steel

Abstract: The texture incorporated during cold rolling of maraging steel persists even when the samples are annealed at temperatures close to the melting point. The texture influences the microstructural developments observed following aging, which in turn affects the magnetic properties of maraging steel. The maximum coercive field, observed after aging at about 700°C, increased from about 11 140 A m−1 in the as rolled and aged condition to about 14 720 A m−1 in the specimen annealed at 1000°C before aging. The corresponding saturation magnetisation values also increased from about 1·040 to about 1·300 T. The prior annealing affects the morphology of the precipitates as well as the reverted austenite.MST/3129

Influence of heat treatment under hot isostatic pressing (HIP) on microstructure of intermetallic-reinforced tool steel manufactured by laser powder bed fusion

Abstract: Microstructure and properties of as-built laser powder bed fusion (LPBF) steels differ from the conventional ones, and they may contain some porosity and lack of fusion. Therefore, post-treatments, including hot isostatic pressing (HIP), are used to densify the material, and tailor the properties of the final product. Usually, HIP is performed as an operation separate from heat treatment. In the present investigation a new approach was used, in which the whole cycle of the heat treatment was carried out in HIP under pressure, and the influence of HIP on microstructure of an advanced stainless maraging tool steel manufactured by LPBF was investigated. For a comparison, a conventional steel grade of the same chemical composition, after a heat treatment at the same temperature-time conditions, was also characterized. The microstructure of the steel was investigated by means of advanced microscopy and atom probe tomography. The influence of the manufacturing route, heat treatment and HIP on microstructure, austenitic phase fraction and size distribution of precipitates was investigated, and the role of high pressure in stabilization of austenite in the microstructure was discussed. It was concluded that since HIP influences phase transformations, a fundamental understanding of the influence of HIP on microstructure is necessary, and development of new post processing regimes guaranteeing the best performance of the material is required.