Interfacial characteristic and mechanical performance of maraging steel-copper functional bimetal produced by selective laser melting based hybrid manufacture

Abstract Additive manufacturing process of maraging steel has been studied for high value parts in aerospace and automotive industries. The hybrid additive / subtractive manufacturing is effective to achieve tight tolerances and surface finishes. The additive process induces anisotropic mechanical properties of maraging steel, which depends on the laser scanning direction. Because anisotropy in the workpiece material has an influence on the cutting process, the surface finish and the dimension accuracy change according to the direction of the cutter feed with respect to the laser scanning direction. Therefore, the cutting parameters should be determined to control the cutting force considering material anisotropy. The paper discusses the cutting force in milling of maraging steel stacked with selective laser melting, as an additive manufacturing process. Anisotropic effect on the cutting forces is proved with the changing rate of the cutting force in milling of the workpieces stacked by repeating laser scanning at 0/90 degrees and 45/-45 degrees. The cutting forces, then, are analyzed in the chip flow models with piling up of orthogonal cuttings. The force model associates anisotropy with the shear stress on the shear plane. The changes in the cutting forces with the feed direction are discussed in the cutting tests and analysis.

Download Full-text

Microstructure and mechanical performance tailoring of Ti-13Nb-13Zr alloy fabricated by selective laser melting after post heat treatment

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2018.10.030 ◽

2019 ◽

Vol 775 ◽

pp. 1164-1176 ◽

Cited By ~ 6

Author(s):

Libo Zhou ◽

Tiechui Yuan ◽

Ruidi Li ◽

Jianzhong Tang ◽

Minbo Wang ◽

...

Keyword(s):

Heat Treatment ◽

Selective Laser Melting ◽

Mechanical Performance ◽

Laser Melting ◽

Post Heat Treatment ◽

13Zr Alloy

Download Full-text

Anisotropic Cutting Force Characteristics in Milling of Maraging Steel Processed Through Selective Laser Melting

Volume 1: Additive Manufacturing; Advanced Materials Manufacturing; Biomanufacturing; Life Cycle Engineering; Manufacturing Equipment and Automation ◽

10.1115/msec2021-63704 ◽

2021 ◽

Author(s):

Shoichi Tamura ◽

Takashi Matsumura ◽

Atsushi Ezura ◽

Kazuo Mori

Keyword(s):

Additive Manufacturing ◽

Cutting Force ◽

Maraging Steel ◽

Selective Laser Melting ◽

Cutting Forces ◽

Manufacturing Process ◽

Laser Scanning ◽

Force Model ◽

Laser Melting ◽

Scanning Direction

Abstract Additive manufacturing process of maraging steel has been studied for high value parts in aerospace and automotive industries. The hybrid additive / subtractive manufacturing is effective to achieve tight tolerances and surface finishes. The additive process induces anisotropic mechanical properties of maraging steel, which depends on the laser scanning direction. Because anisotropy in the workpiece material has an influence on the cutting process, the surface finish and the dimension accuracy change according to the direction of the cutter feed with respect to the laser scanning direction. Therefore, the cutting parameters should be determined to control the cutting force considering material anisotropy. The paper discusses the cutting force in milling of maraging steel stacked with selective laser melting, as an additive manufacturing process. Anisotropic effect on the cutting forces is proved with the changing rate of the cutting force in milling of the workpieces stacked by repeating laser scanning at 0/90 degrees and 45/−45 degrees. The cutting forces, then, are analyzed in the chip flow models with piling up of orthogonal cuttings. The force model associates anisotropy with the shear stress on the shear plane. The changes in the cutting forces with the feed direction are discussed in the cutting tests and analysis.

Download Full-text

Hydrogen Embrittlement Behavior of 18Ni 300 Maraging Steel Produced by Selective Laser Melting

Materials ◽

10.3390/ma12152360 ◽

2019 ◽

Vol 12 (15) ◽

pp. 2360 ◽

Cited By ~ 2

Author(s):

Young Jin Kwon ◽

Riccardo Casati ◽

Mauro Coduri ◽

Maurizio Vedani ◽

Chong Soo Lee

Keyword(s):

Hydrogen Embrittlement ◽

Maraging Steel ◽

Selective Laser Melting ◽

Solution Treatment ◽

Tensile Tests ◽

Constant Current ◽

Hydrogen Atoms ◽

Laser Melting ◽

Constant Current Density ◽

Hydrogen Charging

A study was performed to investigate the hydrogen embrittlement behavior of 18-Ni 300 maraging steel produced by selective laser melting and subjected to different heat treatment strategies. Hydrogen was pre-charged into the tensile samples by an electro-chemical method at the constant current density of 1 A m−2 and 50 A m−2 for 48 h at room temperature. Charged and uncharged specimens were subjected to tensile tests and the hydrogen concentration was eventually analysed using quadrupole mass spectroscopy. After tensile tests, uncharged maraging samples showed fracture surfaces with dimples. Conversely, in H-charged alloys, quasi-cleavage mode fractures occurred. A lower concentration of trapped hydrogen atoms and higher elongation at fracture were measured in the H-charged samples that were subjected to solution treatment prior to hydrogen charging, compared to the as-built counterparts. Isothermal aging treatment performed at 460 °C for 8 h before hydrogen charging increased the concentration of trapped hydrogen, giving rise to higher hydrogen embrittlement susceptibility.

Download Full-text