scholarly journals Investigation of the Surface Properties and Wear Properties of AISI H11 Steel Treated by Auxiliary Heating Plasma Nitriding

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 528 ◽  
Author(s):  
Hongzhi Yan ◽  
Linhe Zhao ◽  
Zhi Chen ◽  
Xuan Hu ◽  
Zhaojun Yan
Keyword(s):  
Surface Properties ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Nitriding Temperature ◽  
Auxiliary Heating ◽  
Wear Properties ◽  
Wear Rates ◽  
Diffusion Layers ◽  
Friction Temperature ◽  
Thickness Of Diffusion Layer

This paper presents an auxiliary heating method to maintain a uniform specimen temperature and precisely control nitriding temperature during plasma nitriding. The surface properties and wear properties of AISI H11 steel treated by auxiliary heating plasma nitriding are investigated. Firstly, the specimens with different diffusion layers and different hardness levels are fabricated through changing the plasma nitriding temperature. Secondly, the surface properties of the plasma-nitrided H11 steel specimens are characterized by a scanning electron microscope (SEM), X-ray diffractometer, metallographic microscope and microhardness tester. The results show that the surface hardness of the plasma-nitrided specimen is almost twice as high as that of the untreated specimen. The thickness of diffusion layer increases with the increase of nitriding temperature. However, the surface hardness firstly increases and then decreases with the increase of the nitriding temperature. Finally, the wear properties of untreated and plasma-nitrided H11 steel specimens are investigated under different friction conditions. The results show that the plasma-nitriding method can significantly improve the wear resistance of AISI H11 steel. The friction coefficient fluctuations of the plasma-nitrided specimens are all lower than those of the untreated specimens. In addition, the wear rates of the plasma-nitrided specimens rise along with load, and reduce along with the sliding speed and friction temperature.

Ti6Al4V Surface Hardness Improvement by Duplex Coating

2013 ◽  
Vol 701 ◽  
pp. 370-374
Author(s):  
Yusliza Yusuf ◽  
Zulkifli Mohd Rosli ◽  
Jariah Mohamad Juoi ◽  
Zainab Mahamud ◽  
Kwan Wai Loon
Keyword(s):  
Microwave Plasma ◽  
Plasma Nitriding ◽  
Microstructural Analysis ◽  
Surface Hardness ◽  
Hardness Measurement ◽  
Compound Layer ◽  
Ti6al4v Alloy ◽  
Process Time ◽  
Wear Properties ◽  
Duplex Coating

Ti6Al4V alloy are among the most widely used materials in engineering applications. This is because their relatively beneficial properties. However, inadequate wear properties of Ti6Al4V alloy have largely constrained the application for this material. In this study, Plasma nitriding of the Ti6Al4V was performed using microwave plasma technique at 600°C for 1hour, 3 hours and 5 hours then followed with deposition of CrN on plasma nitrided samples for duplex coating purposes. Microstructural analysis and hardness measurement revealed that formation of Ti2N and TiN phases indicating the formation of compound layer is observed for substrate nitrided at temperature as low as 600°C 1 hour and a substantial increase on the surface hardness of plasma nitrided Ti6Al4V is observed with an increase of process time. The duplex coating obtained in this study has significant surface hardness property and superior as compared with CrN coatings deposited on as received Ti6Al4V.

Corrosion Behavior of Various Surface Treatments Ti-6Al-4V Alloy - A Review

2013 ◽  
Vol 849 ◽  
pp. 58-61 ◽  
Author(s):  
Yusliza Yusuf ◽  
Nooririnah Binti Omar ◽  
Muhamad Azwar Azhari ◽  
Md Ashadi Bin Md Johari
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Biomedical Application ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Surface Treatments ◽  
Wear Properties ◽  
Resistance Property ◽  
Corrosion Resistance Property

A Ti-6Al-4V alloy has been widely used as suitable materials for several of application such as aerospace, marine and biomedical application. Although this alloy is excellent in its properties and good corrosion resistance, the applications are limited because of their poor tribological property referring to the wear resistance property due to their low surface hardness. Therefore, it is inevitable to improve the wear properties of Ti-6Al-4V without detrimental the initial corrosion resistance properties even increasing it for better result. Over the years, various methods of surface treatments for Ti-6Al-4V have been studied and most frequently used are laser treatment, plasma nitriding process, PVD coating and also duplex coating. For each of the surface treatment discussed, several type of corrosion behavior have been studied with the conclusion is comparable to each other. In general, throughout these techniques, the wear resistance property of Ti-6Al-4V was improved and simultaneously improving the corrosion resistance property.

scholarly journals Application of Active-Screen Plasma Nitriding to an Austenitic Stainless Steel Small-Diameter Thin Pipe

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 366
Author(s):  
Kenzo Sumiya ◽  
Shinkichi Tokuyama ◽  
Akio Nishimoto ◽  
Junichi Fukui ◽  
Atsushi Nishiyama
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Low Temperature ◽  
Plasma Nitriding ◽  
Small Diameter ◽  
Surface Hardness ◽  
Bending Rigidity ◽  
Nitriding Temperature ◽  
Active Screen Plasma Nitriding

Low-temperature active-screen plasma nitriding (ASPN) was applied in this study to improve the bending rigidity and corrosion resistance of a small-diameter thin pipe composed of austenitic stainless steel (SUS 304). The inner and outer diameters of the pipe were ϕ0.3 and ϕ0.4 mm, respectively, and the pipe length was 50 mm. The jig temperature was measured using a thermocouple and was adopted as the nitriding temperature because measuring the temperature of a small-diameter pipe is difficult. The nitriding temperature was varied from 578 to 638 K to investigate the effect of temperature on the nitriding layer and mechanical property. The nitriding layer thickness increased with an increase in nitriding temperature, reaching 15 μm at 638 K. The existence of expanded austenite (S phase) in this nitriding layer was revealed using the X-ray diffraction pattern. Moreover, the surface hardness increased with the nitriding temperature and took a maximum value of 1100 HV above 598 K. The bending load increased with an increase in the nitriding temperature in relation to the thicker nitriding layer and increased surface hardness. The nitrided samples did not corrode near the center, and corrosion was noted only near the tip at high nitriding temperatures of 618 and 638 K in a salt spray test. These results indicated that the bending rigidity of the small-diameter thin pipe composed of austenitic stainless steel was successfully improved using low-temperature ASPN while ensuring corrosion resistance.

scholarly journals Assessment of Wear Properties under Dry Sliding Conditions on AISI 301LN Austenitic Stainless Steel by Plasma Nitriding Process

2021 ◽  
Vol 309 ◽  
pp. 01182
Author(s):  
B Divyasri ◽  
Ch. Phani Rama Krishna ◽  
Pradeep Jayappa ◽  
G. Keerthi Reddy ◽  
V. Vinay Kumar ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Behavior ◽  
Plasma Nitriding ◽  
Research Work ◽  
Surface Hardness ◽  
Wear Test ◽  
Iron Nitride ◽  
Variable Load ◽  
Test Machine ◽  
Wear Properties

In industry, mechanical components must operate under conditions conditions such as variable load, speed, temperature and various chemical environments. Materials are selected depending on their application. They are selected for commercial availability, cost and properties such as strength, hardness etc. Many engineering errors are due to fatigue, corrosion and poor wear resistance occurring on its surface. This causes cracks in the surface that shortens the service life of the material. Also, the surfaces of materials are exposed to strong thermal, chemical and shock loads. Chosen for this research work, AISI 301LN materials have low surface hardness and poor wear properties, which can limit their applications were components mate each other. AISI 301LN stainless steel was treated with plasma nitriding at a low temperature of about 650°C. It was observed that a mixture of ferrites and gradually nitrogenous matter accumulates in the following layers namely iron nitride. Further nitriding was carried out to 20 hrs, 40 hrs, 60 hrs and the specimen were named as PL1, PL2 and PL3 respectively. It was observed that Cr-N layer were formed on the outer surface. Wear tests were carried out on a tribological wear test machine to study the wear behavior. A comparison is made between treated and untreated specimens. The microstructures are investigated with scanning electron microscope.

Influence of Duplex Treatment on Structural and Tribological Properties of Commercially Pure Titanium

2017 ◽  
Vol 36 (1) ◽  
pp. 63-68 ◽  
Author(s):  
Ilhan Çelik
Keyword(s):  
Wear Resistance ◽  
Tribological Properties ◽  
Physical Vapor Deposition ◽  
Plasma Nitriding ◽  
Pure Titanium ◽  
Surface Hardness ◽  
Compound Layer ◽  
Commercially Pure Titanium ◽  
Wear Properties ◽  
Commercially Pure

AbstractTitanium and its alloys are widely used in many fields, including aerospace and the chemical and biomedical industries. This is due to their mechanical properties, excellent corrosion resistance, and biocompatibility although they do have poor wear resistance. In this study, a duplex layer was successfully formed on the commercially pure titanium surface by duplex treatments (plasma nitriding and physical vapor deposition (PVD)). In the initial treatment, plasma nitriding was performed on the pure titanium samples and in the second treatment, the nitrided samples were coated with CrN by PVD. The friction and wear properties of the duplex-treated samples were investigated for tribological applications. Surface morphology and microstructure of the duplex-treated samples were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the tribological properties were investigated using pin-on-disc tribometer. A compound layer composed of ε-Ti2N and δ-TiN phases and a diffusion layer formed under the compound layer were obtained on the surface of pure titanium after the nitriding treatments. CrN coated on the nitrided surface provided an increase in the surface hardness and in the wear resistance.

Research on the Nitriding Effect of Ta-10W with Change of Process Parameters

2014 ◽  
Vol 941-944 ◽  
pp. 1406-1409 ◽  
Author(s):  
Xin Hong Xiong ◽  
Jia Lin Chen ◽  
Dun Miao Quan ◽  
Qiao Xin Zhang
Keyword(s):  
Process Parameters ◽  
Erosion Resistance ◽  
Plasma Nitriding ◽  
Surface Hardness ◽  
Thermochemical Treatment ◽  
Treatment Method ◽  
Nitride Layer ◽  
Nitriding Temperature ◽  
Final Effect ◽  
Key Parameter

Plasma nitriding is a thermochemical treatment method to make the metal surface reinforced. It can be used to significantly improve the surface hardness, abrasion resistance, fatigue strength, corrosion and erosion resistance. This paper presents a study of the influence of nitriding temperature and holding time on the nitriding effect while different nitriding process parameters are adopted on Ta-10W board samples by plasma nitriding technology. The result shows that nitriding temperature is the key parameter to the final effect of nitriding. Samples nitrided at 950oC for 10h get thicker nitride layer and more nitrogen in nitride layer.

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