J. Mater. Sci. Technol. ›› 2022, Vol. 120: 227-252.DOI: 10.1016/j.jmst.2021.10.056

• Research Article • Previous Articles     Next Articles

Additive manufacturing of 18% nickel maraging steels: Defect, structure and mechanical properties: A review

Lulu Guoa, Lina Zhanga,*(), Joel Anderssonb, Olanrewaju Ojoa,*()   

  1. aDepartment of Mechanical Engineering, University of Manitoba, Winnipeg R3T 5V6, Canada
    bDepartment of Engineering Science, University West, Trollhättan 461 86, Sweden

Abstract:

This paper reviews the latest research progress in the additive manufacturing (AM) process of 18% nickel maraging steels, which involves laser-based powder bed fusion (L-PBF), laser-based directed energy deposition (L-DED), and wire arc additive manufacturing (WAAM). The emphasis is on the defects, structure, and mechanical properties of the additive manufactured 18% nickel maraging steels. At first, this article outlines the influences of the processing parameters of AM techniques on the defects formed in the fabricated parts, in terms of the L-PBF and WAAM. The macrostructure and microstructure characteristics of as-built and heat-treated 18% nickel maraging steel are then described in detail. Later, the mechanical properties of as-built and heat-treated 18% nickel maraging steel are assessed, such as their tensile, hardness, impact toughness, and fatigue performances. Finally, future directions for work on the AM of 18% nickel maraging steel are provided.

Key words: Additive manufacturing, 18% Nickel maraging steel, Defects, Macrostructure, Microstructure, Mechanical properties