Aging behavior and mechanical properties of maraging steels in the presence of submicrocrystalline Laves phase particles

Mahmoudi, A.H.; Ghavidel, M R Zamanzad; Nedjad, S. Hossein; Heidarzadeh, Akbar; Nili‐Ahmadabadi, Mahmoud

doi:10.1016/j.matchar.2011.07.012

Cited by 21 publications

(22 citation statements)

References 12 publications

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“…Therefore, it can be said that in smaller ARs, there is an increase in aging time of the alloy, delaying the onset of overaging. Based on the average hardness values, the processing) in the matrix, resulting in a lath martensitic structure (Mahmoudi et al, 2011;Hu and Wang, 2012), as shown in Figs. 2a and 2b.…”

Section: Resultsmentioning

confidence: 99%

“…However, recent studies (Hu et al, 2008;Leitner et al, 2011;Mahmoudi et al, 2011;Mahmudi et al, 2011;Nili-Ahmadabadi, 2008;Schnitzer et al, 2010;Sha et al, 2013) are being conducted in maraging steels without cobalt addition, in order to reduce the production costs of this alloy. Maraging steels are considered expensive due to their materials' preparation and expensive alloy elements such as nickel and cobalt processes.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Analysis of Co-Free Maraging Steel Aged

Rodrigues

Bernardi

Otubo

2014

J.Aerosp. Technol. Manag.

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Maraging steels have low carbon content and are highly alloyed, having as main feature the ability to increase the mechanical strength after thermal aging. Therefore, the objective of this work is to analyze the effect of aging in a Cofree maraging steel, Fe -0.014% C -0.3% Mn -3.9% Mo -2.1% Cu -0.19% Si -11.8% Cr -9.1% Ni -1.0% Ti (wt), at different heat treatment times (10 min -960 min) at constant temperature (550°C), after cold rolling up to 66% and 77% area reduction. Microstructures were analyzed by scanning electron microscopy (SEM -EDS) and mechanical properties by Vickers hardness measurements. The results showed a significant increase in the hardness of the material after aging heat treatment on the solution treated and deformed samples. The aging heat treatment which was harder about 650 HV was 550°C/60 min.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Analysis of Co-Free Maraging Steel Aged

Rodrigues

Bernardi

Otubo

2014

J.Aerosp. Technol. Manag.

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“…The amount of carbides in the quenched microstructures exerts an important influence on the characteristic properties of these materials: hardness and resistance to corrosion, abrasion and wear [7]. Maraging steels are a very low carbon high alloy steel first developed in the 1960s for applications requiring ultra-high strength (tensile strength greater than 1,380 MPa) combined with good fracture toughness [8]. The low carbon content avoids the carbides precipitation.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of New Martensitic Stainless Steels Using Scratch and Dry Wear Test

et al. 2014

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This paper focuses on the tribological characterization of new martensitic stainless steels by two different tribological methods (scratch and dry wear tests) and their comparison to the austenitic standard stainless steel AISI 316L. The scratch test allows obtaining critical loads, scratch friction coefficients, scratch hardness and specific scratch wear rate, and the dry wear test to quantify wear volumes. The damage has been studied by ex situ scanning electron microscopy. Wear resistance was related to the hardness and the microstructure of the studied materials, where martensitic stainless steels exhibit higher scratch wear resistance than the austenitic one, but higher hardness of the martensitic alloys did not give better scratch resistance when comparing with themselves. It has been proved it is possible to evaluate the scratch wear resistance of bulk stainless steels using scratch test. The austenitic material presented lower wear volume than the martensitic ones after the dry wear test due to phase transformation and the hardening during sliding.

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“…M 23 C 6 and MX (M = V, Nb, X = C, N) are mentioned as dominant precipitates in tempered martensite, and M 23 C 6 carbides mainly precipitate along prior austenite grain boundaries and martensite packet boundaries [2]. The agglomeration of coarse M 23 C 6 and Laves phase would reduce mechanical properties such as creep resistance and impact toughness in 9Cr heat-resistant steels [3,4]. Another potential precipitate is Laves phase in heat-resistant steels during high-temperature exposure, which has drawn a growing interest for the enhancement of creep strength [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Laves Phase Formation and Its Effect on Mechanical Properties in P91 Steel

Xia

Wang

Zhao

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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Effect of Laves phase formation on mechanical properties in a pressurized T-junction of P91 steel pipe at 849 K for 58,000 h with 25.65 MPa vapor pressure was studied. Thermodynamic calculations had been performed by using the software Thermo-Calc to study the phase at equilibrium state. Counter plot of von Mises stress in the pipe during service life was calculated by finite element analysis to study the effect of the operated stress distribution on the evolution of Laves phase. The change in the microstructure and mechanical properties in the sites with different stress was also studied. The results indicated that the formation of Laves phase in P91 steel was a thermodynamically possible process due to enrichment of Mo and depletion of C adjacent to M 23 C 6 particles or along martensite lath and packet boundaries. The formation of Laves phase had a detrimental influence on the mechanical properties in P91 steel. The mean size of Laves phase would be significantly increased with increasing operated stress, leading to a reduction in tensile properties and impact energy. In particular, crack initiation energy and crack growth energy during impact test rapidly decreased with increasing the mean size and volume fraction of Laves phase.

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Aging behavior and mechanical properties of maraging steels in the presence of submicrocrystalline Laves phase particles

Cited by 21 publications

References 12 publications

Microstructural Analysis of Co-Free Maraging Steel Aged

Microstructural Analysis of Co-Free Maraging Steel Aged

Tribological Behavior of New Martensitic Stainless Steels Using Scratch and Dry Wear Test

Laves Phase Formation and Its Effect on Mechanical Properties in P91 Steel

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