Tensile ductility of a duplex surface treated maraging steel produced by Laser Powder Bed Fusion: Interaction between the inhomogeneous microstructure and transformation induced plasticity
T. Tekin , G. Ischia , F. Naclerio , R. Ipek , A. Molinari
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引用次数: 0
Abstract
The tensile ductility of a surface-treated 18Ni300 maraging steel produced by Laser Powder Bed Fusion (L-PBF) was investigated in the present work. Both plasma nitriding and duplex treatments (plasma nitriding and Physical Vapour Deposition (PVD) coating) were considered using a direct aged material as a reference. The inhomogeneous microstructure of the surface-treated materials causes an early strain-induced austenite transformation, with a positive effect on the uniform plastic deformation. However, the brittle failure of the hardened surface and the coating promotes an inhomogeneous stress field and inhomogeneous deformation whose effect on tensile ductility prevails on the enhanced TRansformation Induced Plasticity (TRIP), resulting in a negative overall effect on ductility.
The study's results suggest a metallurgical approach to optimizing the inhomogeneous microstructure of the surface-treated material, with the aim of preventing the decrease of ductility.
期刊介绍：
Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance:
A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting.
B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.
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