Next Article in Journal
The Unified Creep-Fatigue Equation for Stainless Steel 316
Next Article in Special Issue
A Lightweight Structure Redesign Method Based on Selective Laser Melting
Previous Article in Journal
The Effect of Creep Aging on the Fatigue Fracture Behavior of 2524 Aluminum Alloy
Article Menu

Export Article

Open AccessArticle
Metals 2016, 6(9), 218;

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

Dipartimento di Meccanica, Politecnico di Milano, Milano I-20156, Italy
Institute for Condensed Matter Chemistry and Technologies for Energy, CNR, Lecco I-23900, Italy
Author to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 2 August 2016 / Revised: 31 August 2016 / Accepted: 5 September 2016 / Published: 8 September 2016
(This article belongs to the Special Issue 3D Printing of Metals)
PDF [9820 KB, uploaded 8 September 2016]


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. View Full-Text
Keywords: selective laser melting; maraging steel; aging behaviour; reversed austenite selective laser melting; maraging steel; aging behaviour; reversed austenite

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
Printed Edition Available!
A printed edition of this Special Issue is available here.

Share & Cite This Article

MDPI and ACS Style

Casati, R.; Lemke, J.N.; Tuissi, A.; Vedani, M. Aging Behaviour and Mechanical Performance of 18-Ni 300 Steel Processed by Selective Laser Melting. Metals 2016, 6, 218.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top