Using the Vacuum Ion Nitriding Process to Improve the Quality of 38CrMoAIA Cylinder

2015 ◽  
Vol 1089 ◽  
pp. 93-96
Author(s):  
Liang Zhi Zhang ◽  
Han Zhang ◽  
Lin Yao Ding
Keyword(s):  
Mass Production ◽  
Surface Hardness ◽  
Cylinder Liner ◽  
Nitriding Process ◽  
Good Effect ◽  
Ion Nitriding ◽  
Size Change ◽  
Gas Nitriding ◽  
Hardness Gradient

In order to replace traditional gas nitriding with vacuum ion nitriding process, the 38CrMoAIA cylinder is used for the experimental research. Based on the 10 groups of cylinder specimen analysis of experimental results, surface hardness, hardness gradient, brittleness levels, nitriding depth and size change all meet the requirements of the technology of the cylinder liner. Aiming at the important link in the experiment, some problems needing attention in the process of nitride are put forward. Vacuum ion nitriding due to mature technology, good effect of nitride can be applied to mass production.

Kinetics of nitrided layers formation on low-alloy steels in the gas nitriding process

2020 ◽  
Vol 24 (4) ◽  
pp. 31-36
Author(s):  
Grzegorz Wójcik ◽  
Barbara Kucharska ◽  
Piotr Wach
Keyword(s):  
Diffusion Layer ◽  
Nitrided Layer ◽  
Surface Hardness ◽  
Nitriding Process ◽  
Process Time ◽  
Low Alloy Steels ◽  
Two Phase ◽  
Gas Nitriding ◽  
Alloy Steels ◽  
Kinetics Of

The study examined cylindrical samples made of low-alloy structural steel 42CrMo4 (40HM) and 41CrAlMo7 (38HMJ) subjected to the nitriding process at 540oC during 2, 7, 12 and 17 hours. During the first 2 hours of the process, the atmosphere was ammonia, while the rest of the process was carried out in the atmosphere consisting of 50% ammonia and 50% dissociated ammonia. After the process, surface hardness, hardness distribution at the depth of 50 µm from the surface up to the hardness of the core, and microstructure of the nitrided layer produced were examined. It has been shown that along with the extension of the duration of the nitriding process on 40HM steel, the surface thickness of the layer of nitrides increases from 6 µm after 2 hours to 14 µm after 17 hours of the process and this layer has a two-phase structure (+’), while the thickness of the diffusion layer was from 0.15 to 0.44 mm (depending on the process time). In the case of 38HMJ steel, the thickness of the layer of nitrides increased from 1 µm after 2 hours to 9.5 µm after 17 hours. The thickness of the diffusion layer was from 0.08 to 0.35 µm (depending on the process time).

scholarly journals Dry Sliding Wear Behavior of Austenitic Stainless Steel Material by Gas Nitriding Process

2021 ◽  
Vol 309 ◽  
pp. 01181
Author(s):  
K. Ramya Sree ◽  
D. Raguraman ◽  
J. Saranya ◽  
Animesh Bain ◽  
V. Srinivas Viswanth ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Wear Behavior ◽  
Surface Hardness ◽  
Case Depth ◽  
Nitriding Process ◽  
Dry Sliding Wear ◽  
Low Carbon ◽  
Wear Properties ◽  
Gas Nitriding ◽  
Steel Material

In industries, components must operate under extreme conditions such as high load, speed, temperature and chemical environment. Materials are selected according to commercial availability, cost and their properties such as strength, hardness, etc. AISI 904L is a high-alloy stainless steel with low carbon content, poor surface hardness and wear characteristics. Many engineering failures are caused by fatigue, corrosion, and poor wear resistance, begins at the surface level. This causes cracks in the surface, reducing the material’s life. The surfaces of the materials were subjected to severe thermal, chemical, and shock loads. The selected AISI 904L materials for this work were subjected to gas nitriding process and processed with 3 different time parameters such as 12 hours, 18 hours and 24 hours respectively and named as GN1, GN2 and GN3. The treatments were done at a constant temperature of 650°C. Gas nitriding, in comparison to other nitriding processes such as plasma and liquid nitriding, provides good dimensional stability, reduced deformation, and uniform case depth regardless of the size and shape of the specimen. To analyze the wear properties, a pin on a disc machine is used. Finally, metallographic studies were performed by scanning electron microscopy.

Research on Effect of Ion Nitriding Temperature on Wear Resistance of 40Cr Steel

2011 ◽  
Vol 291-294 ◽  
pp. 101-104
Author(s):  
Guo Xing Pang ◽  
Zhong Lei Li ◽  
Zhi Yong Chen ◽  
Yan Jie Wang
Keyword(s):  
Wear Resistance ◽  
Surface Hardness ◽  
Nitriding Process ◽  
Micro Hardness ◽  
Nitriding Temperature ◽  
Ion Nitriding ◽  
Metallographic Observation ◽  
40Cr Steel

The main purpose of this paper is to research on the different ion nitriding temperatures of 40Cr effect on the surface hardness, wear resistance of the workpiece. With series of experiment and test of micro-hardness, ring-block wear, metallographic observation, to select the optimization temperature for the ion nitriding process of 40Cr steel.

Research on Ion Nitriding Temperature Effect on Wear Resistance of 35CrMo Steel

2011 ◽  
Vol 341-342 ◽  
pp. 128-132 ◽  
Author(s):  
Guo Xing Pang ◽  
Zhi Yong Chen ◽  
Zhong Lei Li ◽  
Yan Jie Wang
Keyword(s):  
Wear Resistance ◽  
Temperature Effect ◽  
Surface Hardness ◽  
Nitriding Process ◽  
Micro Hardness ◽  
Nitriding Temperature ◽  
Ion Nitriding ◽  
35Crmo Steel ◽  
Metallographic Observation

The main purpose of this paper is to research on the different ion nitriding temperatures of 35CrMo effect on the surface hardness, wear resistance of the workpiece. With series of experiment and test of micro-hardness, ring-block wear, metallographic observation, to select the optimization temperature for the ion nitriding process of 35CrMo steel.

Improving the Hardness of a Wind Turbine Gear Surface by Nitriding Process

2014 ◽  
Vol 591 ◽  
pp. 19-22
Author(s):  
P. Sakthivel ◽  
G.P. Rajamani
Keyword(s):  
Wind Turbine ◽  
Impact Load ◽  
Surface Hardness ◽  
Hardness Test ◽  
Nitriding Process ◽  
Gas Nitriding ◽  
Large Size ◽  
Surface Failure ◽  
Steel Material ◽  
Suitable Process

This paper presents a surface hardness improvement methodology of a wind turbine helical gear which is made up on EN36 alloy steel material. Now days the wind turbine gears are frequently failed due to high contact stress, due to sudden impact load, change of wind speed and wind directions. Pitting is a method of surface failure in a gear. So, to avoid the gear failures we need to improve the surface hardness of wind turbine gears by using Nitriding process. There are three modes of hardness test taken from this process to improve the hardness. They are before nitriding, after nitriding & without nitriding. By comparing the hardness test values, Gas Nitriding is the best suitable process to increase the surface hardness of a large size gear. By the method of improving surface hardness of wind turbine gear, the load withstanding capacity of the wind turbine gears are increased, pitting failure may be avoided at a desired level and the power production rate is increased.

Nitriding

2005 ◽  
pp. 227-244
Keyword(s):  
Heat Treatment ◽  
Surface Hardening ◽  
Elevated Temperatures ◽  
Surface Hardness ◽  
Ion Nitriding ◽  
Gear Teeth ◽  
Gas Nitriding ◽  
Aerospace Applications ◽  
High Shock ◽  
Hardening Heat Treatment

Abstract Nitriding is a surface hardening heat treatment that introduces nitrogen into the surface of steel while it is in the ferritic condition. Gas nitriding using ammonia as the nitrogen-carrying species is the most commonly employed process and is emphasized in this chapter. Nitriding produces a wear- and fatigue-resistant surface on gear teeth and is used in applications where gears are not subjected to high shock loads or contact stress. It is useful for gears that need to maintain their surface hardness at elevated temperatures. Gears used in industrial, automotive, and aerospace applications are commonly nitride. This chapter discusses the processes involved in gas, controlled, and ion nitriding.

scholarly journals Control of Local Hardness Gradient of Metal Surface by Inclined Surface Treatment Using Ultrasonic Nanocrystal Surface Modification

2021 ◽  
Vol 8 (2) ◽  
pp. 533-546
Author(s):  
Yeong-Kwan Jo ◽  
Yeong-Wook Gil ◽  
Do-Sik Shim ◽  
Young-Sik Pyun ◽  
Sang-Hu Park
Keyword(s):  
Surface Modification ◽  
Surface Treatment ◽  
Metal Surface ◽  
Incident Angle ◽  
Surface Hardness ◽  
Parameter Study ◽  
Local Hardness ◽  
Practical Usefulness ◽  
Inclined Surface ◽  
Hardness Gradient

AbstractWe propose an effective method to control the local hardness and morphology of a metal surface by tilting the incident angle of a horn during ultrasonic nanocrystal surface modification (UNSM). In this study, surface treatment using UNSM was performed on an S45C specimen and a parameter study was conducted for optimization. The process parameters were the feeding rate, static load, striking force, and processing angle (Ф). In particular, the Ф was analyzed by tilting the horn by 0°, 10°, 20°, 30°, 40°, and 45° to understand its effect on surface hardness and changes in the morphology. From fundamental experiments, some important phenomena were observed, such as grain-microstructure changes along the processing and thickness directions. Furthermore, to verify the practical usefulness of this study, a flat and a hemispherical specimen of S45C material were treated using UNSM with various values of Ф. A significant change in hardness (an increase from 2–45%) and a gradual hardness gradient on the tested specimens could be easily realized by the proposed method. Therefore, we believe that the method is effective for controlling the mechanical hardness of a metal surface.

Research and Application on Screen Soft Proofing Technology in Printing Quality Control

2012 ◽  
Vol 262 ◽  
pp. 263-268
Author(s):  
Zhan Jun Si ◽  
Jia Wang ◽  
Chong Gu
Keyword(s):  
Quality Control ◽  
Good Effect ◽  
Color Management ◽  
Actual Situation ◽  
Testing Scheme ◽  
Printing Quality ◽  
Display Technology ◽  
Soft Proofing ◽  
Display Performance

In recent years, screen soft proofing has matured with the development of color management and display technology, and it has become the direction of printing development and the key of promotion. This article aimed at raising a testing scheme of display performance and adjusting scheme of corresponding display parameters, on this account to test the professional display’s performance, adjust display parameters and make color management. At the same time with reflecting the actual situation of display, a stable and accurate color reproduction environment was provided for screen soft proofing. After that, evaluations were carried out to evaluate printing quality of screen soft proofing on the condition that display’s performance was good, consequently the differences between proofing effects and final printing were studied. The result shows that this testing scheme of display performance can reflect the truth of display which is tested in this paper, the display after adjusted and color management according to this scheme shows good effect in the ability of screen analog proofing original, it can approach the requirements of the printing proofing.

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