Journal ArticleDOI
Effect of cobalt on impact toughness of steels
D. R. Squires,E. A. Wilson +1 more
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In this article, the authors reported that the addition of 9%Co to the base alloy plus 2·5%Mo increases the ductile-brittle transition temperature (DBTT) to 120°C in unaged material.Abstract:
The addition of Co to 18%Ni maraging steels produces an increase in hardness due to a synergistic effect. A similar effect is reported in this paper for maraging steels based on Fe–5Mn–6Ni. However, Co is thought to have an effect on the ductile-brittle transition temperature (DBTT) of mar aging steels. The addition of 9%Co to the base alloy plus 2·5%Mo increases the DBTT to 120°C in unaged material. Similar to reports by other workers on Fe–Co alloys, it is considered that this increase in DBTT is due to Co restricting cross-slip. In contrast, Mo is thought to lower the DBTT by increasing cross-slip. The reason for 2·5%Mo changing the mode of brittle fracture from intergranular to transgranular cleavage in the base alloy is discussed. Mention is also made of the effect of Ni on the DBTT in lath martensite structures. In classical 18%Ni maraging steel, the DBTT of the Fe–18Ni base is probably so low that the addition of Co does not seriously embrittle the steel.MST/1828read more
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Cybermaterials: materials by design and accelerated insertion of materials
Wei Xiong,Gregory B. Olson +1 more
TL;DR: Progress in the development of linkage models of the process-structure–property-performance paradigm, as well as related design accelerating tools are reviewed.
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A novel strengthening and toughening strategy for T250 maraging steel: Cluster-orientation governed higher strength-ductility combination induced by electropulsing
TL;DR: In this article, a high-energy and instantaneous electropulsing is devised to improve the ductility of T250 steel, and the substructure evolution and aging behavior of T 250 steel was systematically investigated by Transmission Electron Microscope (TEM) characterization, APT, Finite Element Modelling (FEM) simulation and Electron Back-Scattered Diffraction (EBSD) technology.
Journal ArticleDOI
Effect of post-weld heat treatments on microstructure and mechanical properties of electron beam welded flow formed maraging steel weldment
TL;DR: In this article, a C-250 maraging steel manufactured by the flow forming technique was joined by the electron beam welding process and various post-welding heat treatments were conducted to improve the overall mechanical properties of the welded tubing.
Journal ArticleDOI
Cobalt and the Toughness of Steel
TL;DR: In this article, the effects of cobalt on the toughness of steel are reviewed. But the authors focus on the effect of alloying additions on the microstructure, strength and fracture resistance.
Journal ArticleDOI
Effect of stress relief on microstructure and mechanical properties of flow formed maraging steel weldment by electron beam welding
TL;DR: In this article, the technique of forward flow forming has been used to produce a long and thin wall tube of C-250 maraging steel, which is usually manufactured by combining aging treatment and electron beam welding (EBW) to increase hardness and strength.
References
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Journal ArticleDOI
Equilibrium segregation in a ternary solution: A model for temper embrittlement
TL;DR: In this paper, the thermodynamic formalism of equilibrium segregation, when taking into account the interaction of M and I atoms in an iron base solid solution can explain this behaviour, is developed.
Journal ArticleDOI
Retained austenite and tempered martensite embrittlement
TL;DR: The problem of detecting the distribution of small amounts (5 pct or less) of retained austenite films around the martensite in quenched and tempered experimental medium carbon Fe/c/x steels is discussed in this article.
Journal ArticleDOI
The link between equilibrium segregation and precipitation in ternary solutions exhibiting temper embrittlement
TL;DR: A ternary addition in the binary solution of an impurity in a metal can reduce the solubility and enhance the grain-boundary segregation of the impurity as mentioned in this paper, showing that both phenomena have a common t
Journal ArticleDOI
Solubility of Phosphorus in α and γ-Iron
Journal ArticleDOI
The influence of Mo on P-lnduced temper embrittlement in Ni-Cr steel
TL;DR: In this article, the effects of the addition of Mo on the temper embrittlement susceptibility of a P-doped Ni-Cr steel were studied, and it was shown that P-induced temper-embrittlement can be eliminated for aging times up to 1000 h at 475 and 500°C, if the scavenging effect of Mo was high enough and if the Mo is not precipitated by C.
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