Effect of laser shock processing and heat treatment sequence on surface layer characteristics of high strength Ni-Co-Mo steel Online publication date: Wed, 06-Jun-2018
by Luca Petan; José Luis Ocaña; Juan Antonio Porro; Janez Grum
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 12, No. 5/6, 2017
Abstract: Tool steels operate in demanding environments since they are usually exposed to chemical, mechanical, and thermal detrimental phenomena. Therefore, there is an interest in investigating surface engineering techniques that can improve their surface characteristics. This paper presents the results our research, where the effects of laser shock peening (LSP) on Ni-Co-Mo maraging steel were investigated by analysing the surface integrity. Maraging steels do not achieve their maximum strength after quenching, but after precipitation hardening. Consequently, there is a distinct difference in the mechanical properties between the solution-annealed condition and precipitation-hardened condition. Because of their particular heat treatment process, the effects of LSP were analysed before and after different sequences of laser peening and heat treatment stages to determine whether the choice of order significantly influences the surface integrity.
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