Tensile ductility of a duplex surface treated maraging steel produced by Laser Powder Bed Fusion: Interaction between the inhomogeneous microstructure and transformation induced plasticity

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS Surface & Coatings Technology Pub Date : 2025-01-15 Epub Date: 2024-11-29 DOI:10.1016/j.surfcoat.2024.131603

T. Tekin , G. Ischia , F. Naclerio , R. Ipek , A. Molinari

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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.

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激光粉末床熔合双相表面处理马氏体时效钢的拉伸延展性：不均匀组织与相变诱发塑性的相互作用

研究了激光粉末床熔合法制备的表面处理18Ni300马氏体时效钢的拉伸延展性。以直接时效材料为参考，考虑了等离子体氮化和双相处理（等离子体氮化和物理气相沉积（PVD）涂层）。表面处理材料的不均匀组织导致了早期应变诱导奥氏体转变，对均匀塑性变形有积极影响。然而，硬化表面和涂层的脆性破坏促进了非均匀应力场和非均匀变形，其对拉伸延性的影响在增强的相变诱发塑性（TRIP）中普遍存在，导致对延性的总体负面影响。该研究结果提出了一种冶金方法来优化表面处理材料的不均匀微观结构，目的是防止塑性下降。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

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.