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: In this paper, the authors used topology optimization to derive an optimal pore structure shape with high stiffness, which was verified experimentally and achieved 85% of the performance of the Hashin-Shtrikman (HS) upper bound in numerical simulations.
Abstract: Recent additive manufacturing technologies can be used to fabricate porous metals with precise internal pore structures and effective performance. We use topology optimization to derive an optimal pore structure shape with high stiffness that is verified experimentally. The design maximizes the effective bulk modulus and isotropic stiffness, and the performance is compared with Hashin–Shtrikman (HS) bounds. The optimized structure is fabricated via selective laser melting of maraging steel, which is a high-strength, iron-nickel steel that cannot easily be made porous with conventional methods. The optimal porous structure achieved 85% of the performance of the HS upper bound in numerical simulations, and at least 90% of them were realized in compressive testing. Finally, the performance is discussed relative to that of other metals.
40 citations
TL;DR: In this article, a novel high-wear-resistant dense WC/18Ni-300 maraging steel matrix composite (99.6%) was manufactured by selective laser melting from power mixture of WC and steel and microstructural analysis indicates that the WC particle was either partially or fully melted during SLM process with a homogenous distribution.
40 citations
TL;DR: In this article, the effects of moisture and hydrogen on the rates of fatigue-crack propagation and on the fracture path through the microstructure of 18Ni(250) maraging steel were examined at room temperature in dry and humid argon and hydrogen environments.
39 citations
TL;DR: In this paper, the authors investigated the effect of high-temperature creep resistance on the evolution of martensite precipitates of maraging 300 steel and found that the main strengthening mechanism in a solution treated and aged material is the fine needle shaped Ni 3 (Ti,Mo) precipitates densely dispersed in a single martensitic phase.
39 citations
TL;DR: In this article, the corrosion behavior of an annealed sample of 18 Ni 250 grade maraging steel was investigated in varied conditions of concentration and temperature of sulphuric acid medium, using electrochemical techniques like Tafel polarization and electrochemical impedance spectroscopy (EIS).
Abstract: The corrosion behavior of aged and annealed sample of 18 Ni 250 grade maraging steel was investigated in varied conditions of concentration and temperature of sulphuric acid medium, using electrochemical techniques like Tafel polarization and electrochemical impedance spectroscopy (EIS). The results obtained from both the techniques are in good agreement. These results have shown increase in corrosion rate of aged specimen with increase in concentration and temperature of sulphuric acid. With increase in concentration of sulphuric acid from 0.025 M to 0.25 M the corrosion rate of annealed sample was found to increase, but there after in 0.5 M, 0.75 M and 1 M, the rate of corrosion decreases, indicating passivation of alloy surface at higher concentration of sulphuric acid. The corrosion rate of aged specimen was found to be higher than that of the annealed specimen. Similar observations are revealed by SEM images. The thermodynamic parameters like activation energy, enthalpy of activation and entropy of activation were calculated.
39 citations