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 optimal heat treatment for heat 2 to obtain the best resistance to cyclic impact loading with acting stress σ≥180 kg/mm2 is aging at 490° for 3 h, and aging at 510° at lower stresses as mentioned in this paper.
Abstract: 1.
Heat 2 has a higher resistance to cyclic impact loading and crack propagation than heats 1, 3, and 4.
2.
The optimal heat treatment for heat 2 to obtain the best resistance to cyclic impact loading with acting stress σ≥180 kg/mm2 is aging at 490° for 3 h, and aging at 510° for 3 h at lower stresses.
3.
Surface hardening (shotpeening) increases the resistance to impact loading more substantially for heat 1 than heat 3.
11 citations
15 Jul 1966
TL;DR: In this article, the HP 9-4-25 medium-alloy martensitic steel and 12Ni maraging steel weldments have nearly equal properties, while the HP 12-Ni steel has the best combination of strength and toughness.
Abstract: : Recent studies of the developments in welding steels with yield strengths greater than 150 ksi have included low-alloy martensitic steels, medium-alloy martensitic steels, nickel maraging steels, and bainitic steels. Only weldments from medium-alloy martensitic steels and nickel maraging steels have mechanical properties approaching those of the base plate without a complete postweld heat treatment. The most serious problem with the other steel is low toughness in the weld fusion zone. Adequate weld metal toughness under conditions of elastic strain can be obtarined over the entire 150 to 225 ksi yield-strength range only if the tungsten-arc welding process is used. Processes with higher deposition rates can produce comparable weld deposits only in the lower portion of the range. Above a yield strength of 200 ksi, 18Ni maraging steel weldments have the best combination of strength and toughness. Below 200 ksi, the HP 9-4-25 medium-alloy martensitic steel and 12Ni maraging steel weldments have nearly equal properties.
11 citations
TL;DR: In this article, the changes in the morphology of lath martensite with hot-deformation of austenite were studied by using an 18Ni maraging steel and the relationship between packet size (or block width) of martensites and the grain size of the prior austenites was discussed in detail.
11 citations
TL;DR: In this paper, an ultra-high-strength low-alloy NiSiCrCoMo steel has been developed, with tensile, impact and fracture toughness properties matching those of maraging steel 250 grade in tonnage scale melts.
Abstract: An ultra-high-strength low-alloy NiSiCrCoMo steel has been developed. The development work is part of a major programme at the Defence Metallurgical Research Laboratory in the field of ultra-high-strength, high-fracture-toughness steels. In this context we undertook investigations to understand the effect of solute additions on the fracture behaviour of Armco iron and Fe-C alloys. We investigated Fe-Ni, Fe-Co, Fe-Si, Fe-Mo, Fe-C-Ni and Fe-C-Co alloys for mechanical behaviour. The report by Garrison (1986) on a Fe-C-Ni-Si-Cr alloy was an important pointer to a low-alloy, ultra-high-strength steel with high fracture toughness. The material we have now arrived at is a Fe-C-Ni-Si-Cr-Co-Mo steel with tensile, impact and fracture toughness properties matching those of maraging steel 250 grade in tonnage scale melts.
11 citations
TL;DR: In this article, a physics-based modeling and prediction for the volume fractions of phase transformation in continuous heating under anisothermal conditions are developed based upon the addition of volume fractions in sequential segmented isothermal processes of grinding.
Abstract: The modeling of maraging steel phase transformation in grinding process is presented in this article. Specifically, heating rate and contact zone temperature are examined to quantitatively link material properties, wheel topography characteristics and process parameters to the kinetics of diffusion-controlled transformation and diffusionless transformation. Physics-based modeling and prediction for the volume fractions of phase transformation in continuous heating under anisothermal conditions are developed based upon the addition of volume fractions in sequential segmented isothermal processes of grinding. The predictive model is validated by 18Ni (250) maraging steel grinding experiments, X-ray diffraction measurements and regression analyses. Results are compared to the model predicted of martensite and ferrite phase volume fractions after grinding. The physics-based model is experimentally validated as viable to predict the occurrence and extent of phase transformation related to material prop...
11 citations