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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.


Papers
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Journal ArticleDOI
TL;DR: In this article , a combination of thermodynamics predictions and experimental measurements were carried out to model the issues of fine precipitate evolutions and the relationship between the strengthened particles and mechanical properties of PH13-8Mo steels under various heat treatment conditions.
Abstract: Precipitation hardening maraging steels possess of great importance with attractive properties in various industrial applications. However, a major confusion about the fine precipitate evolutions and the relationships between the strengthened particles and mechanical properties of PH13–8Mo steels under various heat treatment conditions remains to be further investigated. To shed light on the direct relationships between the fine nano-phase and mechanical properties, a combination of thermodynamics predictions and experimental measurements were carried out to model the issues. The investigation results reveal that the coherent NiAl nano-precipitates distributed on the lath-like martensite matrix firstly presented a steady growth and then a significant coarsening of approximately 9 nm at 593 °C for 5 h. The acicular or block-like diffusion-controlled reverted austenite enriched in Ni element with a tendency of growth was clarified, which maintains the K–S orientation relationship with martensite matrix after diverse aging treatments. The current studied PH13–8Mo steel displays comparable mechanical properties despite over-aging conditions, and the sharp drops in hardness and the steady increment in impact energy were systematically examined. The excellent work hardening behaviors of the present steel were modeled, which indicates that the modified Ludwik model displays significantly improved agreement with the experimental data than the widely accepted Hollomon model. The five strengthening mechanism models are discussed and the C–O-M model exhibits high consistency with the experimental data with a value of 652 MPa. The growth of nano-precipitates maybe prohibits the dislocations from cutting the particles, which promotes the hardening behaviors. This work offers a valuable reference for further quantitively experimental illustrates.

6 citations

Patent
29 Aug 1979
TL;DR: In this paper, the authors proposed to enhance the strength and toughness of an Ni-contg. alloy steel by lowering the contents of C, Si, Mn, etc., and carrying out specified heat treatment to form martensite single-phase structure.
Abstract: PURPOSE: To enhance the strength and toughness of an Ni-contg. alloy steel by lowering the contents of C, Si, Mn, etc. of the steel, adding Mo, Ti, etc., and carrying out specified heat treatment to form martensite single-phase structure. CONSTITUTION: An alloy steel contg. 0.05W0.3% C, <0.1% Si, <0.1% Mn, 6.0W 12.0% Ni, 0.5W5.0% Mo, 0.1W2.0% Ti and 0.1W2.0% Al or further contg. 1.0W 8.0% Co is subjected to solubilizing treatment at ≥800°C to dissolve the Mo, Ti or Co in the matrix metal. The treated steel is cooled at ≥5°C/min cooling rate to form martensite single-phase structure, and then it is tempered at 100W700°C to provide high strength, toughness and weldability comparable to those of maraging steel. The lowered contents of C, Mn, Si, etc. result in enhanced toughness, and insufficient strength due to the lowered C content is compensated for by the precipitation of alloying elements such as Mo and Ti. COPYRIGHT: (C)1981,JPO&Japio

6 citations

Patent
30 Mar 1981
TL;DR: In this paper, a maraging steel ingot contg 3W20% Ni, 5W25% Co and 5W17% Mo, <20% W, <45% Ti and <25% Al and having ≥250kg/mm 2 tensile strength is heated to 1,100°C to thoroughly solubilize the precipitates of the contained strengthening elements in the austenite matrix.
Abstract: PURPOSE: To remarkably enhance the strength of a maraging steel by adding specified elements to the steel and subjecting the steel to heat treatment and working under specified conditions CONSTITUTION: A maraging steel ingot contg 3W20% Ni, 5W25% Co, 5W17% Mo, <20% W, <45% Ti and <25% Al and having ≥250kg/mm 2 tensile strength is heated to ≥1,100°C to thoroughly solubilize the precipitates of the contained strengthening elements in the austenite matrix The ingot is then hot worked at the temp W1,000°C to make the austenite grains fine The hot working is stopped in the temp range of 1,000W900°C During this time, the ingot is air- cooled, and when the temp reaches ≤900°C, the ingot is worked again ≥2 times at ≥50% degree of working Hardening and tempering are finally carried out to uniformly precipitate a fine intermetallic compound, whereby the material strength is increased remarkably COPYRIGHT: (C)1982,JPO&Japio

6 citations

Journal ArticleDOI
TL;DR: In this paper, a flow formed C-250 maraging steel tubing was welded by electron beam welded (EBW) process and subsequently age hardened, and the tensile strength was increased by 12% and the percentage elongation was remarkably increased by 92%.
Abstract: A flow formed C-250 maraging steel tubing was welded by electron beam welded (EBW) process and subsequently age hardened. Conventional EB welding with high energy input had resulted in seriously inadequate percentage elongation of the weldment. With an additional prewelding stress relief treatment and EBW with a lower energy input, the elongation of the weldment showed significant improvement after being treated with age hardening. It was found that the tensile strength was increased by 12% and the percentage elongation was remarkably increased by 92%.

6 citations

Journal ArticleDOI
TL;DR: The influence of rare earth Ce(III) ions on the corrosion behavior of high strength maraging steel in 0.5 M sulfuric acid solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques.
Abstract: The influence of rare earth Ce(III) ions on the corrosion behaviour of high strength maraging steel in 0.5 M sulfuric acid solution was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Ce3þ can significantly reduce corrosion deterioration up to 5.0 mM. Beyond that level the corrosion rate increases till a steady value. High corrosion protection of steel surface after exposure to the acidic solution containing the optimal Ce(III) concentration is revealed by SEM investigations

5 citations


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