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: In this article, the structural formation and properties of austenite in martensite aged (maraging) 03N18K9M5T steel were analyzed, determining its resilience to heating, supercooling, and plastic deformation.
Abstract: —The structural formation and properties of austenite in martensite aged (maraging) 03N18K9M5T steel were analyzed. The morphological features of austenite, determining its resilience to heating, supercooling, and plastic deformation, were established. The difference between the characteristics of residual and reverted austenite was substantiated. The contributions of phase hardening and dispersion of crystals to the yield strength of residual austenite were determined. The role of both types of austenite in the formation of steel was shown as well.
4 citations
TL;DR: In this article, the effect of multiple laser shock peening on residual stress, microhardness and tensile properties of direct metal laser sintered Maraging steel 300 is investigated.
Abstract: In this study, the effect of multiple laser shock peening on residual stress, microhardness and tensile properties of direct metal laser sintered Maraging steel 300 is investigated. Multiple laser peening has introduced significant compressive stress in the as-fabricated (−598 MPa) and aged (−653 MPa) samples when compared to the unpeened samples (as-fabricated −270 MPa, aged −310 MPa). Further, it is observed that multiple laser peening led to grain refinement and generation of strain near the surface of laser peened samples. A reduction in crystallite size is observed on increasing the number of laser impacts. The yield strength of laser peened samples is improved by 12.88% and 9.77% in the as-fabricated and aged samples, respectively, in comparison to the unpeened condition. Similarly, the laser peening of as-fabricated and aged samples led to an increase in microhardness by 6.5% and 13.2%, respectively, compared to the unpeened samples.
4 citations
TL;DR: In this paper, Staron et al. used APFIM to determine the type and composition of fine precipitates in maraging steels, and the advantages and disadvantages of SANS and APFim are briefly discussed.
Abstract: Further to the paper by Staron, Jamnig, Leitner, Ebner & Clemens [J. Appl. Cryst. (2003), 36, 415–419], the following points are made. Characterization of the precipitation process in maraging steels is difficult, primarily because the precipitates formed are on the nanometre scale. Identification of the precipitate type is complicated by the fact that its composition evolves during ageing, even when the precipitate type remains unchanged. Interpretation of experimental results should be treated with caution, especially when indirect methods, such as small-angle neutron scattering (SANS), are used. Atom-probe field ion microscopy (APFIM) has proved to be capable of determining the type and composition of the fine precipitates in maraging steels. The advantages and disadvantages of SANS and APFIM are briefly discussed.
4 citations
TL;DR: In this paper, the effect of elastic strain rates ranging from 0.001 to 10/sec and temperatures ranging from 200K (-100F) to 590K (600F) on the yield strength of several steels is reported.
Abstract: : The effect of elastic strain rates ranging from 0.001 to 10/sec and temperatures ranging from 200K (-100F) to 590K (600F) on the yield strength of several steels is reported. The steels utilized are a 1018 mild steel, 4340 steel, H-11 tool steel and 300 grade maraging steel. The results are interpreted in terms of the Cottrel-Bilby yielding model based on release of dislocations from locking carbon atmospheres. The results for all of the materials except the maraging steel are consistent with this model if it is modified to account for re-locking of dislocations by migration of carbon atoms. The maraging steel shows a constant strain rate sensitivity at a constant temperature, over the range of strain rates investigated. This rate sensitivity decreases with increasing temperature and at 590K (600 F) a decreasing strength with increasing strain rate is found. This is attributed to stress aging effects. (Author)
4 citations
01 Jan 2015
TL;DR: In this paper, a DC-pulsed plasma nitriding reactor was used to produce case depths of 50 μm for maraging 300 steel, in both solution annealed and aged conditions, and it was observed that the microstructure of the core material remains unaltered as the typical martensite plate-like microstructured of maraging steels.
Abstract: Simultaneous nitriding and aging heat treatment of maraging 300 steel was carried out inside a DC-pulsed plasma nitriding reactor. A single heat treatment cycle was done, as the plasma nitriding and age hardening processes occur at the same ranges of temperatures and times. Samples of maraging 300 steel, in the solution annealed and solution annealed and aged conditions, were tested. Plasma nitriding and aging, carried out at 480 °C for 3 h, increased the surface hardness up to 1140 HV, producing case depths of 50 μm since e-Fe3N and γ′-Fe4N nitrides were formed in the hardened surface layer. It is observed that the microstructure of the core material remains unaltered as the typical martensite plate-like microstructure of maraging steels. The core hardness of solution annealed samples increased from 331 to 597 HV after the plasma nitriding treatment proving the possibility of nitriding and aging at the same treatment cycle. The pre-aged samples did not show any overaging or martensite reversion to austenite after the simultaneous plasma nitriding and aging treatments, that could be showed by the core hardness of 620 HV and can be related to the time of total aging exposure of 6 h, including pre-aging and plasma nitriding.
4 citations