Topic
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.
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TL;DR: The results show that the partial substitution of Al by Ti results in a different precipitation behaviour, and the Ti-containing grade shows a change in the type of precipitates during ageing, which leads to an accelerated coarsening and thus to a faster drop in hardness.
61 citations
TL;DR: In this paper, the authors present an experimental study of milling operations performed on 18Ni(300) maraging steel components produced by selective laser melting (SLM), where the SLM process variables taken into consideration were the build direction and post-build heat treatment, while cutting speed was considered as the only process variable for the milling phase.
Abstract: This paper presents an experimental study of milling operations performed on 18Ni(300) maraging steel components produced by selective laser melting (SLM). The aim was to identify the manufacturing process chain to obtain the best properties of finished 18Ni(300) molds produced by a combination of additive and subtractive manufacturing methods. The SLM process variables taken into consideration were the build direction and post-build heat treatment, while cutting speed was considered as the only process variable for the milling phase. Surface roughness and hardness, cutting forces and tool wear were considered for the evaluation of the optimal manufacturing process parameters.
60 citations
TL;DR: In this paper, the effects of cyclic-stress frequency at various stress-intensity ranges below K Iscc on rates of crack growth were investigated in 12Ni-5Cr-3Mo maraging steel in a room-temperature 3 per cent solution of sodium chloride.
59 citations
15 Aug 2006-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the microstructural evolution of an experimental Fe-1.4C-2.4Mo-6.0Al secondary hardening steel has been studied during isothermal aging at 610°C.
Abstract: The microstructural evolution of an experimental Fe-1.4C-2.6Cr-1.4Mo-6.0Ni-5.0Al (composition in at.%) secondary hardening steel has been studied during isothermal aging at 610 °C. Atom probe field ion microscopy and transmission electron microscopy have been used to characterise precipitate types and precipitation sequences as well as to examine changes in the solute distribution. The strengthening effects were identified as multiphase precipitation processes of secondary hardening carbides and an intermetallic β-NiAl phase, starting at aging times of less than 1 min. The results are discussed regarding the evolution of phase composition and precipitate morphology. Special emphasis is placed on the comparison of the NiAl precipitation behaviour in the investigated experimental steel and in C-free PH13-8 maraging steel.
59 citations
18 Mar 2019-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, solution annealing and hardening treatments were applied to the printed samples to induce changes in their microstructures and mechanical properties, and compared to those of a bar of conventional steel with the same chemical composition.
Abstract: Additive manufacturing (AM) is an advanced technology used for the manufacture of products that have intricate shapes and complex inner geometries. Various metal powders can be used for AM; however, the resulting microstructures will differ profoundly from those obtained via the casting, heat treatment, or thermomechanical processing of metals with the same chemical composition. This is because of the rapid heating and cooling rates used during three-dimensional (3D) printing. Further complications arise from the repeated heating and cooling of some regions, which is owed to the step-by-step formation of the solidified layers. A powder consisting of 1.2709 (X3NiCoMoTi 18-9-5) low-carbon maraging steel was used in an AM experiment. Given the high residual stresses that exist within printed metals, a post-processing heat treatment is desirable to limit the risk of cracking. In this study, solution annealing and hardening treatments were applied to the printed samples to induce changes in their microstructures and mechanical properties. The mechanical properties and microstructures of the builds were characterised and compared to those of a bar of conventional steel with the same chemical composition. During tensile loading, the fracture that was initiated at the sites of metallurgical defects was observed in situ.
59 citations