Research on Fast Nitriding by Direct Current Field Base on the Deep-layer QPQ Technology

Wang, K.; Luo, Dehan; Zhang, L.

doi:10.1016/j.phpro.2013.11.019

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…While increasing the time of the chemical treatment process, the corrosion resistance is significantly improved [4]. The direct current QPQ method was first implemented to improve the deep coating layer thickness of steel within a short period [5]. The hardness, deformations, and residual stresses of AMS6265 steel have been improved by the vacuum-carburizing process at high-pressure conditions in the QPQ method [6].…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of Quench Polish Quench (QPQ) coating on AISI 4150 steel

Boopathi¹

2022

Eng. Res. Express

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In this research, the hardness, layer thickness, and corrosion rate of the nitro-carburizing coating on AISI 4150 steel using the Quench-Polish-Quench (QPQ) process have been investigated. Nitro-carburizing temperature (T), nitro-carburizing time (tc), and oxidation time (to) are considered coating parameters. The experiments were designed and analyzed to investigate the effects of coating parameters on responses by the Taguchi method. A 590 °C temperature of the nitro-carburizing solution and a 145-minute duration of both the nitro-carburizing and oxidizing processes have been predicted to obtain the maximum micro-hardness (504.71 HV) and coating-layer thickness (13.60 µm). A 570 °C temperature of the nitro-carburizing solution with the same process time is predicted to obtain the lowest corrosion rate (1.27 mm/miles). The optimum parameters set are used to perform Scanning electron microscopy (SEM), X-ray diffraction (XRD), and Energy-dispersive X-ray Spectroscopy (EDS) analyses.

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Section: Introductionmentioning

confidence: 99%

An experimental investigation of Quench Polish Quench (QPQ) coating on AISI 4150 steel

Boopathi¹

2022

Eng. Res. Express

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show abstract

“…While increasing the time of the chemical treatment process, the corrosion resistance is significantly improved to the maximum level [4]. Direct current treatment of the QPQ methods is first implemented to improve the deep layer on the surface of steel within a short time [5]. The hardness, deformations, and residual stresses of AMS6265 steel have been improved by the vacuum-carburizing process at high-pressure conditions in the QPQ method [6].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Quench Polish Quench (QPQ) Coating Process Using Taguchi Method

Saravanan

Vasanth

Boopathi³

et al. 2022

KEM

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In this research, the thickness of coating layer and hardness of coated 316L stainless steel surface has been improved by Quench Polish Quench (QPQ) coating process. The influences of nitriding Temperature(T), nitriding time(tc), and Oxidation time(to) on hardness and thickness of coated surface have also been investigated using Taguchi method. During this process, the percentage of carbonate and cyanate, post oxidation temperature, and time are constantly maintained. The experimental investigations have been performed using the Taguchi analysis to examine the effects and to predict the combination of optimum processing time settings. The nitriding time and temperature are significantly contributed to the hardness and maximizing the thickness respectively. The level-3 of all process parameters has been recommended to maximize the hardness (800 Hv) and layer thickness (19.6 µm). The microstructure of the Layer thickness on the coated stainless-steel surface has been illustrated using a Scanning Electron Microscope (SEM) image.

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Effect of elemental doping on the catalytic activity of ABO3 perovskite oxides during low-pressure gas nitriding

Zhang

Wang

Chen

et al. 2021

Applied Surface Science

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Research on Fast Nitriding by Direct Current Field Base on the Deep-layer QPQ Technology

Cited by 5 publications

References 2 publications

An experimental investigation of Quench Polish Quench (QPQ) coating on AISI 4150 steel

An experimental investigation of Quench Polish Quench (QPQ) coating on AISI 4150 steel

Optimization of Quench Polish Quench (QPQ) Coating Process Using Taguchi Method

Effect of elemental doping on the catalytic activity of ABO3 perovskite oxides during low-pressure gas nitriding

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