Aging Behaviour and Mechanical Performance of 18-Ni 300 Steel Processed by Selective Laser Melting

By R. Casati, J. Lemke, Ausonio Tuissi, Maurizio Vedani. 2016

255 citations recorded by the source corpus.

An 18-Ni 300 grade maraging steel was processed by selective laser melting and an investigation was carried out on microstructural and mechanical behaviour as a function of aging condition. Owing to the rapid cooling rate, the as-built alloy featured a full potential for precipitate strengthening, without the need of a solution treatment prior to aging. The amount of reversed austenite found in the microstructure increased after aging and revealed to depend on aging temperature and time. Similarly to the corresponding wrought counterpart, also in the selective laser-melted 18-Ni 300 alloy, aging promoted a dramatic increase in strength with respect to the as-built condition and a drop in tensile ductility. No systematic changes were found in tensile properties as a function of measured amount of austenite. It is proposed that the submicrometric structure and the phase distribution inherited by the rapid solidification condition brought by selective laser melting are such that changes in tensile strength and ductility are mainly governed by the effects brought by the strengthening precipitates, whereas the concurrent reversion of the γ-Fe phase in different amounts seems to play a minor role.

Subfields: Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/285039b6c3dacb571b5c0ceed28f67f61313cbee

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In Mechanical Engineering

1. Chao-lin Tan
2. K. Zhou
3. Wenyou Ma
4. E. Jägle
5. M. Laleh
6. Dierk Raabe
7. M. Moyle
8. P. Kürnsteiner

Citations in the corpus

• Plastic anisotropy of additively manufactured maraging steel: Influence of the build orientation and heat treatments (2019, background): “The most comprehensive of these studies in terms of the reported mechanical properties is [7], which monitors the effect of an array of aging heat-treatments on the static properties of AM fabricated maraging steel 300.”
• Additive manufacturing of steels: a review of achievements and challenges (2020, background): “[112] Casati R, Lemke JN, Tuissi A, Vedani M (2016) Aging behaviour and mechanical performance of 18-Ni 300 steel processed by selective laser melting.”
• Microstructural characterization and properties of selective laser melted maraging steel with different build directions (2018, background): “Nevertheless, compared with the intensively reported titanium alloy [19], nickel alloy [20] and aluminium alloy [21], relatively few researches concerning SLM fabricated MS have been reported, and they generally focused on laser process optimization [22,23], heat treatment exploration and mechanical”
• The influence of aging temperature and aging time on the mechanical and tribological properties of selective laser melted maraging 18Ni-300 steel (2018, methodology): “1%) at the cellular boundaries under high aging temperature [26,29,46].”
• Steels in additive manufacturing: A review of their microstructure and properties (2020, background): “from 381 to 645 HV) and in tensile strength accompanied by a reduction in ductility is observed, as expected [119, 125,129,131].”