The Role of Diffusion Media in Nitriding Process on Surface Layers Characteristics of AISI 4140 with and without Hard Chrome Coatings
Journal Title: Tribology in Industry - Year 2016, Vol 38, Issue 3
Abstract
The surface layer characteristics of the AISI 4140 tool steel treated by nitriding gas before and after hard chrome plating utilizing pure nitrogen diffusion media (fluidized bed reactor) and the without gas (muffle reactor) has been studied experimentally. The result shows that nitriding substrate with hard chrome layers has nitrogen atoms concentration almost twice greater than that without hard chrome layers. After being given a hard chrome plating, nitriding on AISI 4140 steel generally has a nitrogen concentration of up to 4 times more than the substrate without hard chrome coating. Almost the entire specimen showed the highest concentration of N atoms in the area below the surface (hardening depth of 200 to 450 µm). N atoms diffusion depth profile has a correlation with hardening depth profile, especially on the specimens layered with hard chromium. The substrate without hard chrome plating tends to have higher surface hardness than the sub-surface. The results show that the effectiveness and efficiency of the gas nitriding diffusion process can be produced without the use of gas in the muffle reactor but the specimens must be hard chromium coated first. This phenomenon can be explained by the role of the passive layer formation that works as a barrier to keeps the spreading of N atoms concentrated in sub-surface areas.
Authors and Affiliations
K. A. Widi , I. Wardana , W. Suprapto , Y. S. Irawan
Emission and Friction Analysis of IC Engine Running in Methanol Blend
Emission and friction are considered to be the significant contributors towards engine parasitic losses. Inherent engine design responsible for such irregularities is difficult to eliminate totally, as millions of engine...
The Initial Estimate of the Useful Lifetime of the Oil in Diesel Engines Using Oil Analysis
In this paper the Initial lifetime of the lubricating oil in 70 Diesel engines model E6-350 ECONODYNE 4VH has been estimated using oil analysis. The engines have been installed on the super heavy vehicles. This method is...
The Accelerated Aging Effect of Salt Water on Lignocellulosic Fibre Reinforced Composites
In recent years natural fibre reinforced composite materials have received an increasing attention in consideration of their biodegradability and admirable mechanical properties. The present paper reveals the experimenta...
Wear Behavior of Austempered Ductile Iron with Nanosized Additives
The microstructure and properties of austempered ductile iron (ADI) strengthened with nanosized addtives of titanium nitride + titanium carbonitride (TiN + TiCN), titanium nitride TiN and cubic boron nitride cBN are i...
Tribological Properties of Silicone Rubber-Based Ceramizable Composites Destined for Wire Covers. Part I. Studies of Block-On-Ring Friction Contact
Ceramizable composites of silicone rubber matrix become more and more popular materials destined for wire covers, what can enhance fire safety of building increasing operation time of important equipment or devices (eg f...