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 paper, the yield strength of a maraging steel was modeled using data gained by atom probe tomography and the influence of reverted austenite on the strength was considered as tensile tests on samples consisting of pure austenites were performed and subtracted from the overall curves.
56 citations
TL;DR: In this article, the effect of laser-induced high-intensity stress waves on the hardness, fatigue resistance, and microstructure in the heat affected zone of welded 18 Ni(250) maraging steel was investigated.
Abstract: The effect of laser‐induced high‐intensity stress waves on the hardness, fatigue resistance, and microstructure in the heat affected zone of welded 18 Ni(250) maraging steel was investigated. Laser‐shock processing increased the hardness and fatigue strength of the weldments. Some melting of the surface was involved during laser‐shock hardening which produced the reverted austenite phase. Microscopic analyses showed an increased dislocation density in the laser‐shocked area.
56 citations
TL;DR: Fidelle and Rapin France as mentioned in this paper present a discussion of hydrogen embrittlement in stainless steel and a paper on maraging steel at a conference held at Valdue on 27-28 September 1967.
Abstract: J P Fidelle and M Rapin France: Commissariat a l'Energie Atomique 1969 pp 362 price FF95 This volume consists of the papers and a report on the discussion of a conference held at Valdue on 27–28 September 1967. Apart from two short papers by Troiario and his associates on hydrogen embrittlement in stainless steel, a paper on maraging steel and a final summing up, the proceedings are in French.
55 citations
TL;DR: In this paper, the cyclic σ-e curves of annealed and aged maraging steels were determined using incremental step testing and stable hysteresis loop tip measurements.
Abstract: The cyclic stress-strain curves, the low cycle and high cycle fatigue lives and the fatigue crack growth rates of annealed (1 h 820°C) and aged (3 h 480°C) maraging steel 300 were determined. Incremental step testing and stable hysteresis loop tip measurements were used to determine the cyclic σ-e curves. Both annealed and aged maraging steels were found to cyclically soften at room temperature over a plastic strain range from 0.1 to 20 pct. The S-N curves were determined from 10 to 107 cycles to failure by plastic strain controlled low cycle fatigue tests performed in air and load controlled high cycle fatigue tests performed in dry argon. The test results compared very well with the theoretical lifetime predictions derived from Tomkins’ theory. Fatigue crack growth rates were measured in air and dry argon for the annealed and aged alloys. Crack growth rates of annealed maraging steel were found to be equal to those of aged maraging steel at rates between 10-7 and 10-5 in./cycle. A significant difference in crack growth rates in the two environments was found at low stress intensity factor ranges, indicating a high susceptibility to corrosion fatigue in the presence of water vapor. The mechanisms of cyclic softening in the two alloys are discussed in terms of dislocations rearrangement in the annealed alloy and dislocation-precipitate interactions in the aged alloy.
55 citations
TL;DR: A new type of maraging steel, Sandvik 1RK91, intended for use in surgical applications has recently been developed at Sandvik Steel as discussed by the authors, which showed a remarkably high microstructural stability against overaging, softening being observed only at 580 °C.
Abstract: A new type of maraging steel, Sandvik 1RK91, intended for use in surgical applications has recently been developed at Sandvik Steel, Sandviken, Sweden. In the present article, a comparison was made between this steel and a traditional maraging steel with respect to mechanical and physical properties after tempering treatments in the temperature range 375 °C to 580 °C. The tempering behavior was studied by analyzing hardness, resistivity, and volume fraction of magnetic phase. Sandvik 1RK91 showed a remarkably high microstructural stability against overaging, softening being observed only at 580 °C. In comparison with the reference steel, the hardness of Sandvik 1RK91 was found to be considerably higher in the whole range of temperatures, with the maximum values corresponding to a strength of 3000 MPa for the smallest dimensions of wire. A detailed microstructural investigation of precipitation reactions in Sandvik 1RK91 revealed a new type of precipitate at 475 °C that was found to be of a quasicrystalline nature. These precipitates, which were found to give the major contribution to particle strengthening after tempering at 475 °C, showed a close resemblance to intermetallic trigonalR phase with a chemical composition of about 50 pct molybdenum, 15 pct chromium, 30 pct iron, and 5 pct silicon. The similarity between the quasicrystalline precipitates andR phase was reflected as a second-order transition occurring at about 525 °C. The extremely high strength in 1RK91 can be ascribed to the quasicrystalline nature of the precipitates because of impeded particle shearing.
55 citations