Wear Behavior of Conventionally and Directly Aged Maraging 18Ni-300 Steel Produced by Laser Powder Bed Fusion.

Kichang Bae,Dohyung Kim,Yongho Park,Wookjin Lee

doi:10.3390/ma14102588

Kichang Bae, Dohyung Kim + Show 2 more

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https://doi.org/10.3390/ma14102588

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Abstract

This study aims to explore the wear performance of maraging 18Ni-300 steel, fabricated via laser powder bed fusion (LPBF). The building direction dependence of wear resistance was investigated with various wear loads and in terms of ball-on-disk wear tests. The effect of direct aging heat treatment, i.e., aging without solution heat treatment, on the wear performance was investigated by comparing the wear rates of directly aged samples, followed by solution heat treatment. The effect of counterpart material on the wear performance of the maraging steel was studied using two counterpart materials of bearing steel and ZrO2 balls. When the bearing steel ball was used as the counterpart material, both the as-built and heat-treated maraging steel produced by the LPBF showed pronounced building direction dependence on their wear performance when the applied wear load was sufficiently high. However, when the ZrO2 ball was used as the counterpart material, isotropic wear resistance was reported. The maraging steel produced by the LPBF demonstrated excellent wear resistance, particularly when it was aging heat-treated and the counterpart material was ZrO2. The directly aged sample showed wear performance almost the same as the sample solution heat-treated and then aged, indicating that direct aging can be used as an alternative post heat treatment for tribological applications of the maraging steels produced by LPBF.

Highlights

Additive manufacturing (AM), a new manufacturing technology in which components are produced in a layer-by-layer manner, has been in the spotlight recently as an alternative to the traditional manufacturing methods for multiple industrial applications
The maraging steel produced by the laser powder bed fusion (LPBF) presented a hardness of
The building direction dependency of the wear resistance, the influences of heat treatment conditions, and counterpart materials were analyzed under various wear loads in the range of 5 to 50 N

Summary

Introduction

Additive manufacturing (AM), a new manufacturing technology in which components are produced in a layer-by-layer manner, has been in the spotlight recently as an alternative to the traditional manufacturing methods for multiple industrial applications. AM techniques, the laser powder bed fusion (LPBF) process is one of the most commonly used techniques to produce metallic components with complex 3D shapes [1,2]. In this technique, the metallic powder feedstock is delivered to the workpiece by spreading flat powder layers in the powder bed during the process. A layer is consolidated by fusing a selective area of each powder layer by laser scanning.

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