Journal ArticleDOI
Effect of aging on microstructure and mechanical properties of cobalt free 18%Ni (250 grade) maraging steel
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In this paper, the influence of aging on the microstructure, tensile properties, fracture toughness, and fractographic features of a cobalt free 18%Ni 250 grade maraging steel has been investigated.Abstract:
The influence of aging on the microstructure, tensile properties, fracture toughness, and fractographic features of a cobalt free 18%Ni 250 grade maraging steel has been investigated. This steel, designated as T250 steel, with 17.1%Ni, 2.25%Mo, and 1.39%Ti as the main alloying elements, contains no cobalt and less molybdenum than the widely used 18Ni-8Co-5Mo type 250 maraging steel (M250). The present investigation shows that tensile properties as well as plane strain fracture toughness values comparable with those of M250 can be obtained in the T250 steel with marginal change in aging cycle. The Ni3 Ti phase precipitating in the present steel has been found to have excellent resistance to coarsening at the normal aging temperatures. The condition for maximum yield and tensile strengths is also the one that gives peak values of toughness. While a low value of toughness in the underaged condition is attributed to the planar slip mode of deformation, the formation of reverted austenite and coarsenin...read more
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Intrinsic self-sensing concrete and structures: A review
Baoguo Han,Siqi Ding,Xun Yu +2 more
TL;DR: This paper systematically introduces research progress of the Intrinsic self-sensing concrete, with attentions to its compositions, fabrication methods, sensing signal testing methods, sensed properties and generation mechanism, and structural applications.
Journal ArticleDOI
Tensile, fracture, and fatigue crack growth properties of a 3D printed maraging steel through selective laser melting
TL;DR: In this article, the microstructure and room temperature mechanical properties of a 18Ni (300) grade maraging steel (MS) fabricated using the selective laser melting (SLM) technique were studied, in both before-and after-aging conditions.
Journal ArticleDOI
Ageing behaviour of an Fe–20Ni–1.8Mn–1.6Ti–0.59Al (wt%) maraging alloy: clustering, precipitation and hardening
TL;DR: In this article, changes in the solute distribution as well as the evolution of precipitation, microstructure and mechanical properties have been studied in an experimental maraging Fe-20Ni-1.8Mn−1.59Al (wt%) alloy during ageing at 550 °C.
Journal ArticleDOI
Precipitate evolution and strengthening behavior during aging process in a 2.5 GPa grade maraging steel
TL;DR: In this paper, an interesting co-precipitation mechanism of Ni3Ti and Mo-rich nanoparticles in a 2.5 GPa grade maraging steel was revealed, and four modified theoretical prediction models were introduced to describe the yield strength as a function of microstructure and precipitates characteristics.
Journal ArticleDOI
Influence of reverted austenite on static and dynamic mechanical properties of a PH 13-8 Mo maraging steel
Ronald Schnitzer,Gerald A. Zickler,Erhardt Lach,Helmut Clemens,Silvia Zinner,Thomas Lippmann,Harald Leitner +6 more
TL;DR: In this paper, the phase fraction of austenite with respect to a split-Hopkinson-pressure-bar was investigated by in situ X-ray diffraction using synchrotron radiation.
References
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Journal ArticleDOI
Granulation, Phase Change, and Microstructure Kinetics of Phase Change. III
TL;DR: In this paper, a comprehensive description of the phenomena of phase change may be summarized in Phase Change, Grain Number and Microstructure Formulas or Diagrams, giving, respectively, the transformed volume, grain, and microstructure densities as a function of time, temperature, and other variables.
Journal ArticleDOI
An investigation of the plastic fracture of AISI 4340 and 18 Nickel-200 grade maraging steels
T. B. Cox,John R. Low +1 more
TL;DR: In this paper, the authors studied the mechanisms of plastic fracture in high-purity and commercial 18 Ni, 200 grade maraging steels and quenched and tempered AISI 4340 steels.
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Nucleation on dislocations
TL;DR: In this paper, the activation energy of nucleation of a second phase on a dislocation is calculated, assuming an elastic model of dislocation and an incoherent precipitate, and it is found that the nucleation energy decreases even more rapidly with increasing thermodynamic driving force.
Journal ArticleDOI
Precipitation reactions and strengthening behavior in 18 wt pct nickel maraging steels
TL;DR: In this article, the Johnson-Mehl-Avarami equation was used to describe the kinetics of precipitate nucleation in maraging steels C-250 and T-250, and the crystallography, structure and composition of the strengthening precipitates were studied utilizing analytical electron microscopy and computersimulated electron diffraction patterns.
Journal ArticleDOI
Precipitation of Carbon and Nitrogen in Cold-Worked Alpha-Iron
TL;DR: In this article, the strain-induced precipitation of carbon and nitrogen from supersaturated solution in alpha-iron is shown to be in agreement with dislocation mechanism and estimates of the dislocation density required to produce the observed precipitation rates are in agreement to dislocation theory.