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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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DOI
01 Apr 1970
TL;DR: In this paper, the authors used precracked cantilever beam specimens to study stress-corrosion cracking of an 18 pct Ni maraging steel in aqueous solutions.
Abstract: Stress-corrosion cracking of an 18 pct Ni maraging steel in aqueous solutions was studied using precracked cantilever beam specimens. By appropriate heat treatments, six different structures having the same yield strength were obtained. Although significantly different plane strain fracture toughness values (KIc) resulted, it was found that the threshold plane strain stress intensity (KIscc) was the same for all structures.KIscc had the same value in 3 pct NaCl at various pH values, in 1N H2SO4, and in distilled water. Specimens tested in 3 pct NaCl under both anodic and cathodic applied potentials also exhibited this sameKIscc value. Fractographic inspection of the crack surfaces revealed no apparent differences due to changes in solution, pH, or applied potential. The crack path was intergranular in all cases. However, specimens austenitized at 1500°F exhibited crack branching, whereas in specimens austenized at much higher temperatures branching no longer occurred. Aging time and temperature seemed to change only the time to failure. The mechanism most consistent with all observations appears to be hydrogen cracking.

10 citations

Journal ArticleDOI
TL;DR: In this paper, an interesting phenomenon of solid-state dendrite formation was observed during elevated temperature treatment of maraging steel in air, where the steel was subjected to heat treatment at temperatures ranging from 900 to 1350 °C for 1-8 h.
Abstract: An interesting phenomenon of solid-state dendrite formation was observed during elevated temperature treatment of maraging steel in air. The steel was subjected to heat treatment at temperatures ranging from 900 to 1350 °C for 1–8 h. The study revealed different phases formed into the depth. A band containing dendrites was observed below the oxidized surface layer. Energy dispersive spectrometry and X-ray phase analysis confirmed that these dendrites were enriched in titanium and are of type Ti 1− x (Mo, Fe, Co) x (N, O) where 0.2 x

10 citations

Journal ArticleDOI
TL;DR: In this paper, the authors describe a steel with yield strength exceeding 1900 MPa and fracture toughness in the range of 40-50 MPa m1/2, in its optimum heat treated condition.
Abstract: The present paper describes a steel with yield strength exceeding 1900 MPa and fracture toughness in the range of 40–50 MPa m1/2, in its optimum heat treated condition. Its strength is similar to that of 18 Ni (300) grade of maraging steel with good fracture toughness. When tempered at 300°C, it shows tempered martensite along with a small amount of retained austenite phase. The steel shows nearly 25% reduction in weight over typical rolled homogeneous armour (RHA) steel against high velocity hard steel core projectiles. The processing, microstructure, mechanical and ballistic properties of the steel are demonstrated.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the microstructure and microtexture of forged 18 Ni C300 maraging steel at different solution annealed temperatures were studied to show strain distribution associated with forged surface distance.
Abstract: Microstructure and microtexture of forged 18 Ni C300 maraging steel at different solution annealed temperatures were studied to show strain distribution associated with forged surface distance. Samples were examined by Electron Back-Scattered Diffraction to characterize the microstructural parameters such as grain sizes, grain orientation and boundary characteristics throughout the forged samples at the surface, quarter depth and centre areas. The results showed a grain refinement across the forging depth, without changing its hardness. In addition, the textural variation was highly dependent on the value of local strain during forging processing. A high number of grains oriented along {001} planes parallel to forging direction (FD) were formed close to the forged surface. While, {110}//FD and {111}//FD texture fibres developed significantly by increasing the distance of forged surface.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of cold rolling on the mechanical properties of Fe-10Ni-7Mn steel was investigated, and substantial improvement was found at thickness reductions larger than 60%, where severe plastic deformation and ultrafine grain formation were realized.
Abstract: Maraging steels are a group of martensitic steels possessing ultra high strength along with good fracture toughness. Conventional 18 wt.% Ni maraging steels are very costly in part because of expensive alloying elements such as Ni and Co. Replacement of Ni by cheaper elements like Mn has been studied by many researchers. Fe–Ni–Mn ternary alloys show good age hardenability formation of nanometer sized intermetallic precipitates such as f.c.t. θ-NiMn during aging. These alloys are ductile in the solution annealed condition but suffer from severe embrittlement after aging by intergranular fracture along prior austenite grain boundaries (PAGBs). Discontinuous coarsening of grain boundary precipitates was found as the main source of embrittlement. In this paper the effect of cold rolling on the mechanical properties of Fe-10Ni-7Mn steel was investigated. Cold rolling for 20%, 40%, 60%, 80% and 90% were carried out on a solution annealed material with subsequent aging at 753 K. Improvements in the tensile properties of the as-deformed and aged alloys were found. Substantial improvement is found at thickness reductions larger than 60%, where severe plastic deformation and ultrafine grain formation are realized.

10 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023101
2022177
2021119
202089
201993
201874