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.

High pressures with supported opposed steel anvils

Abstract: It is shown that opposed, supported maraging steel anvils are capable of generating pressures in excess of the upper bismuth transition at 75 kilobar, and in excess of the InAs transition at 85 kilobar, or more than four times the compressive yield stress of the material.

Dependence of Microstructure, Relative Density and Hardness of 18Ni-300 Maraging Steel Fabricated by Selective Laser Melting on the Energy Density

Abstract: 18Ni-300 maraging steel samples were fabricated by Selective Laser Melting technology (SLM). Microstructure and phase transformation before and after aging treatment were investigated by Optical Microscopy (OM), Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). Meanwhile, hardness and relative density of samples were also tested. The results showed that there was a positive correlation relationship between energy density and relative density. Samples fabricated with high energy density of 6.0 J/mm2 could lead to extremely high relative density of 99.34%; After aging heat treatment (763 K for 4 h), the microhardness increased from 370 to 629 HV because of second phases such as Ni3Mo and Ni3Ti precipitated in the martensite matrix. When aging temperature reached to 793 K, the hardness was affected by both precipitation of strengthening phase and austenite reversion which had the opposite effect. The XRD results showed the appearance of austenite and the decrease of martensite.

Insights into the Transformation-Induced Plasticity (TRIP) Effect in Ti-Free Grade 300 Maraging Steel Manufactured by Laser Powder Bed Fusion (LPBF)

Abstract: The near-net fabrication capabilities of laser powder-bed fusion (LPBF) offer the potential to manufacture tools with complex cooling channels that can improve the production efficiency of the tools with reduced greenhouse gas emissions. High strength, toughness, and wear resistance are some of the key properties required by the tooling industries to qualify tools. While strength can be increased through appropriate heat treatments, the increase in strength comes with an associated ductility loss. We show that the non-equilibrium conditions inherent to LPBF can suppress the transformation-induced plasticity effect to room temperature in a Ti-free version of grade 300 maraging steel (G300MS), which is commonly not observed at room temperature in G300MS manufactured using conventional methods. The presence of retained austenite along with Ni-rich regions was found to increase the kinetics for austenite reversion during aging, thereby enabling the transformation of austenite into e martensite during tensile deformation at room temperature, in turn increasing the strength with minimal ductility loss.

The influence of heat treatment on mechanical and fatigue properties of maraging steels

Abstract: Mechanical and fatigue properties of two maraging steels, 03Kh10N8K10M5T and 03Kh11N10M2T, were investigated after various heat treatments. The influence of the aging temperature, phase composition and stability of the reversed austenite on the complex of mechanical properties and fatigue strength of maraging steels was considered

Method for fast displaying original austenite grains of maraging steel containing Cr

Abstract: The invention relates to a method for fast displaying original austenite grains of maraging steel containing Cr. The method is characterized by comprising the following steps: a, preparing a sample, wherein an aging state sample is subjected to grinding and polishing; b, configuring a corrodent, wherein 10 ml distilled water is poured in a utensil, 10 ml hydrochloric acid and 1-2 ml nitric acid are added into the distilled water, stirring by a glass rod is performed, still standing is carried out, the weight percentage of the hydrochloric acid is 36%, and the weight percentage of the nitric acid is 68%; c, performing sample corrosion, wherein absorbent cotton is placed at the bottom of the utensil, the polished sample is placed in the corrodent for corrosion, the erosion surface of the sample is downward, the erosion time is 20-30 s, when the polished surface of the sample becomes gray, the sample is taken out, cleaned and dried, and the austenite grains are observed under a microscope. The method has the advantages that heating is eliminated, and the operation can be carried out at room temperature; the operation is simple, and the corrosion time is short; the repeatability is better.