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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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Patent
31 Jan 2007
TL;DR: In this article, a method of manufacturing a maraging steel strip having high fatigue strength equal to or higher than that of a steel strip containing Ti by optimizing a chemical component and nitriding treatment was proposed.
Abstract: PROBLEM TO BE SOLVED: To provide a method of manufacturing a maraging steel strip having high fatigue strength equal to or higher than that of maraging steel containing Ti by optimizing a chemical component and nitriding treatment, in the maraging steel in which Ti contained as a strengthening element is reduced. SOLUTION: In this method of manufacturing for the maraging steel strip having high fatigue strength, the maraging steel strip containing, by mass, 17.0 to 22.0% Ni, 0.1 to 4.0% Cr, 3.0 to 7.0% Mo, >7.0% and ≤20.0% Co, ≤0.1% Ti, and ≤0.01% (not including 0%) B is used as raw material, and after the raw material is heated and retained under a gaseous atmosphere containing a fluorine compound to thereby remove an oxidized film formed on the surface of the raw material, the nitriding treatment is performed in a nitriding gas in which a value of a gas composition ratio of NH 3 /H 2 is adjusted to 1 to 3 under 400 to 500°C. COPYRIGHT: (C)2008,JPO&INPIT

4 citations

Journal Article
TL;DR: In this article, the effects of repair welding on tensile strength and fracture toughness of aged weldments of 18 Ni 250-grade maraging steel have been studied in terms of microstructural conditions in the various affected and unaffected zones of the initial weld.
Abstract: The effects of repair welding on tensile strength and fracture toughness of aged weldments of 18 Ni 250-grade maraging steel have been studied. It has been established that aged weldments in the steel can be repaired and approximately 95% of the tensile strength of the initial welds could be achieved by postrepair aging treatment. Also, the repairs had practically no effect on the fracture toughness (K[sub IC]) of the weldment. These results have been discussed in terms of microstructural conditions in the various affected and unaffected zones of the initial weld. One important inference that emerges from the mechanical properties-microstructural correlation in the study is that (K[sub IC]) of the weld is independent of the gross microstructural features of the dendritic size and shapes in the ranges observed in this study. It has, however, been cautioned that the above statement is not valid in cases in which heavy segregation occurs along the interdendritic boundaries resulting in heavily banded microstructure. This can result from faulty weld parameters such as excessive heat input. A second aging to recover the mechanical properties of the repaired zone has additional beneficial effects on tensile strengths and helps in maintaining fracture toughness to the original levelmore » of the initial weld.« less

4 citations

Journal ArticleDOI
TL;DR: In this article, a new internal friction peak caused by hydrogen in the maraging steel and compared it with those found in stainless steels which have so far been studied as typical engineering high-alloy materials.

4 citations

Journal ArticleDOI
TL;DR: In this article, it was shown that an increment in KIC is associated with slow crack growth of delayed failure, which precedes the unstable fracture, and that tensile ductility also decreases under the same condition in which an apparent KIC increases.
Abstract: prior T grain size and the delayed failure crack was observed in front of the fatigue precrack. This study has been made in order to investigate these phenomena in more details and to discuss the mechanism by which KIC is increased. It is made clear that an increment in KIC is completely associated with slow crack growth of delayed failure which precedes the unstable fracture. However, its increment is not an increment in true KIC as a material constant but an increment in apparent KIC This may be due to the blunting at crack front caused by the microbranching of the delayed failure crack, the degree of which also depends upon the prior ƒÁ grain size. Tensile ductility also markedly decreases under the same condition in which an apparent KIC increases. This is attributed to the occurence of the delayed failure crack at the specimen surface adjacent to or in the necking region. Thus, the 18Ni margaing steel with low temperature aged structure shows the complicated behavior on toughness and ductility because of the high sensitivity to delayed failure. (Received Oct. 18, 1973)

4 citations

Journal ArticleDOI
TL;DR: In this article, an analysis of hot deformation behavior under a wide range of temperatures and strain rates was carried out to map the microstructural evolution as a function of process parameters to obtain defect-free products.
Abstract: The ultrahigh strength (2,400 MPa) 18Ni maraging steel (M350 grade) is widely used for critical structural applications, such as aircraft landing gears, in which the strength–toughness balance is the essential criterion for material selection. Microstructure control during thermomechanical processing is the key to obtain the desired mechanical properties on a repeatable basis in a manufacturing environment. This involves thorough understanding of the hot deformation behavior under a wide range of temperatures and strain rates to map the microstructural evolution as a function of process parameters to obtain defect-free products. Towards achieving this goal of optimization of hot workability with a view to control microstructure for M350 grade maraging steel, hot deformation processing maps have been developed and correlated to the microstructure evolved. Further, analysis of stress–strain curves was carried out to obtain fine prior austenite grain (PAG) size via discontinuous dynamic recrystallization, and the same was verified experimentally by the microstructures evolved through hot isothermal compression tests on cylindrical specimens subjected to different strain levels. A single peak DRX type σ − e curve was selected for analyses. The theoretically determined critical strain value was verified experimentally for initiation of DRX (DRXI) and transition from DRX dominant region to grain growth dominant region (DRXT). Hot isothermal compression tests have been conducted at T = 950°C and e, ˙, , =, 0.01, , s, −, 1, , , , , , and obtained PAG size of 3.14 µm in the specimen deformed to theoretically determined optimum strain of 0.74, thereby validating the used models.

4 citations


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