Unveiling the impact of nitriding and PVD coating on the fatigue properties of L-PBF maraging steel

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-07-01 Epub Date: 2025-04-21 DOI:10.1016/j.msea.2025.148365

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

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Abstract

The fatigue properties of 18Ni-300 maraging steel produced by Laser Powder Bed Fusion (L-PBF) were evaluated under axial fatigue loading. The influence of duplex surface treatments (plasma nitriding followed by PVD) was compared with heat treatments (solution annealing and ageing and direct ageing). Microhardness profiles, microstructural analysis (SEM and TEM) of the surface layers, residual stresses measurements and fractographic analysis were carried out to investigate the relationships between surface treatments and fatigue strength. The results demonstrate that surface treatments enhance fatigue strength, with improvements ranging from 30 % to 100 % in dependence on the stress amplitude, compared to heat treated specimens. The effect of surface treatments on fatigue strength is attributed to surface hardening and compressive residual stresses that tend to shift the crack initiation in the interior and to slow down the crack propagation. The hard and brittle coating causes surface crack initiation in some cases, but this effect on fatigue strength is compensated by the prior nitriding. The results demonstrate that duplex surface treatments substantially improve the fatigue performance of L-PBF maraging steel.

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揭示了氮化和PVD涂层对L-PBF马氏体时效钢疲劳性能的影响

研究了激光粉末床熔合法制备的18Ni-300马氏体时效钢在轴向疲劳载荷下的疲劳性能。比较了复合表面处理（等离子体渗氮后PVD）与热处理（固溶退火时效和直接时效）的影响。采用显微硬度曲线、表层显微组织分析（SEM和TEM）、残余应力测量和断口分析等方法研究了表面处理与疲劳强度之间的关系。结果表明，与热处理试样相比，表面处理提高了疲劳强度，根据应力幅度的不同，其提高幅度从30%到100%不等。表面处理对疲劳强度的影响是由于表面硬化和残余压应力倾向于将裂纹的萌生转移到内部并减缓裂纹的扩展。硬脆涂层在某些情况下会引起表面裂纹，但这种对疲劳强度的影响可以通过事先的氮化处理得到补偿。结果表明，双相表面处理能显著提高L-PBF马氏体时效钢的疲劳性能。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.