scholarly journals Experimental Investigation and Statistical Approach to Wear Characterization of Plasma Nitrided AISI 4140 Steel-A Case Study

2017 ◽  
Vol 15 (1-2) ◽  
Author(s):  
Santosh V. Bhaskar ◽  
Hari N. Kudal
Keyword(s):  
Plasma Nitriding ◽  
Interaction Effects ◽  
Wear Volume ◽  
Effective Parameters ◽  
Operational Parameters ◽  
Sliding Speed ◽  
Aisi 4140 Steel ◽  
Study Results ◽  
Aisi 4140 ◽  
The Impact

<p>Components of forming tool dies such as draw ring, ejector pin use AISI 4140 as material for their manufacturing. The integrity of the die cutting tools is essential to achieve adequate product quality. In present study, the influence of plasma nitriding (PN) on the wear behav-iour of AISI 4140 steel was investigated. Full factorial experimental design technique was used to study the main effects and the interaction effects between operational parameters and the response variable. The control factors at their two levels (-1 and +1) were: applied load (4.905N and 14.715N), sliding speed (3.14 m/s and 5.23 m/s), and sliding distance (500m and 1000m).The parameters were coded as A, B, and C, consecutively, and were investigated at two levels (-1 and +1). Response selected was Wear Volume Loss (WVL). The effects of in-dividual variables and their interaction effects for dependent variables, namely, WVL were determined. The process of selecting significant factors, based on statistical tools, is illustrat-ed. Analysis of Variance (ANOVA) was performed to know the impact of individual factors on the WVL. Untreated and PN treated AISI 4140 specimens were investigated using field emission Scanning Electron Microscope (SEM) equipped with Energy Dispersive X-ray (EDX) analyzer. Finally diagnostics tools were used to check adequacy of the model in terms of assumptions of ANOVA. ‘Design Expert-7’ and ‘Minitab 17’ softwares were used in the study. Results of statistical analysis indicate that the most effective parameters in the WVL were load and sliding speed. The interaction between load and sliding speed was the most influencing interaction. Results of regression analysis indicate regression coefficient (R2) to be above 90% which suggests good predictability of the model. ‘Predicted-R2’ and ‘Adjusted-R2’, found to be in good agreement with R2, for both the materials under investigation. More-over, results of SEM microscopy suggest PN to be an effective technique to reduce wear.</p>

Effect of TiCN and AlCrN Coating on Tribological Behaviour of Plasma-nitrided AISI 4140 Steel

2017 ◽  
Vol 5 (2) ◽  
pp. 1-17
Author(s):  
Santosh Vitthal Bhaskar ◽  
Hari Narayan Kudal
Keyword(s):  
Physical Vapor Deposition ◽  
Sliding Wear ◽  
Plasma Nitriding ◽  
Titanium Carbonitride ◽  
Wear Behaviour ◽  
Dry Sliding Wear ◽  
Tribological Behaviour ◽  
Wear Properties ◽  
Aisi 4140 Steel ◽  
Aisi 4140

In the present article, samples made of AISI 4140 steel, pre-treated with plasma nitriding (PN), and coated with different coatings like Titanium Carbonitride (TiCN), Aluminium Chromium Nitride (AlCrN), using Physical Vapor Deposition (PVD) technique, were investigated in terms of their microhardness, surface roughness, and dry sliding wear behaviour. Wear tests were performed with a pin-on-disc machine. Coatings were deposited on plasma nitrided samples. The wear behaviour, and wear mechanisms of TiCN- and AlCrN-coated, PN treated AISI 4140 specimens were investigated using a field emission Scanning Electron Microscope (SEM), equipped with an Energy Dispersive X-ray (EDX) analyzer. An SEM was used to study the surface morphology of the worn surfaces. Also, adhesion tests were conducted to investigate the adhesion quality of the coated specimens. The results of the investigation showed improved wear properties. Furthermore, the compound layer formed during nitriding was found to act as an intermediate hard layer, leading to superior sliding wear properties.

scholarly journals Influence of Xe Ion-Bombardment on the Substrate Microstructure and the Residual Stresses of Tin Coatings Deposited by Plasma Reactive Sputtering onto AISI 4140 Steel

2014 ◽  
Vol 996 ◽  
pp. 841-847 ◽  
Author(s):  
Thaís Helena Carvalho Miranda ◽  
Sandra Vales ◽  
Erika Ochoa Becerra ◽  
Roosevelt Droppa ◽  
Pedro Brito ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Plasma Nitriding ◽  
Treatment Strategies ◽  
Ion Bombardment ◽  
Surface Finishing ◽  
Temperature Plasma ◽  
Tin Coatings ◽  
Aisi 4140 ◽  
The Impact ◽  
Enhanced Surface

The seek for sustainability in the global economic scenario has led to the need for developing materials that provide higher productivity, greater speed of operation, extended lifetimes and enhanced surface finishing of engineering parts. To achieve these goals it is essential to modify the metal surface with respect to its behavior in situations of friction, wear and oxidation at high temperatures. In this work, we studied the impact of different surface treatment strategies involving atomic peening with Xe ions and low temperature plasma nitriding on the surface microstructure of AISI 4140steel and the consequences of those surface treatments on the residual stresses of TiN coatings deposited onto the pre-treated substrates. The results show that ion bombardment at 1000 eV leads to mainly sputtering of surface material and no appreciable surface activation could be obtained for the subsequent plasma nitriding treatment. In the sample subjected to simple plasma nitriding, the highest nitride content was found and a Ti-enriched transition zone deposition appears to build up during the coating deposition. Accordingly the residual stresses of the TiN coatings deposited onto the nitrided steel surface were significantly lower in comparison to those encountered in the coatings grown on the non-treated, only bombarded and bombarded followed by nitriding substrates.

The effect of applied load and sliding speed on the tribological properties of Nylon 6 and ultra-high-molecular-weight polyethylene

2014 ◽  
Vol 66 (3) ◽  
pp. 498-504 ◽  
Author(s):  
Huseyin Unal ◽  
Salih Hakan Yetgin ◽  
Fehim Findik
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Polymer Material ◽  
Nylon 6 ◽  
Sliding Speed ◽  
Content Type ◽  
Aisi 4140 Steel ◽  
Aisi 4140 ◽  
Engineering Polymers ◽  
Ultra High Molecular Weight

Purpose – The purpose of the study was to find the best performance polymer material to be used in railway car bogies. Design/methodology/approach – Wear tests and optical and scanning electron microscopy were used. Findings – The friction coefficients of ultra-high-molecular-weight polyethylene (UHMWPE) and Nylon 6 polymers, as opposed to AISI 4140 steel, reduced with the increment of applied loads. With the increment of sliding speed, the friction coefficient increased in both UHMWPE and Nylon 6 polymers. The specific wear rate of the UHMWPE polymer was determined to be about 10-14 m2/N, whereas the rate of Nylon 6 was determined to be 10-13 m2/N. Practical implications – The aim of the study was to find the best performance polymer material to be used in railway car bogies. Originality/value – The friction and wear performance of UHMWPE and Nylon 6 engineering polymers were studied and compared to their AISI 4140 steel counterparts. It is an original work and it is not published in any media.

Comparative study of plasma oxynitriding and plasma nitriding for AISI 4140 steel

2016 ◽  
Vol 680 ◽  
pp. 642-645 ◽  
Author(s):  
Jiqiang Wu ◽  
Han Liu ◽  
Jingcai Li ◽  
Xingmei Yang ◽  
Jing Hu
Keyword(s):  
Comparative Study ◽  
Plasma Nitriding ◽  
Aisi 4140 Steel ◽  
Aisi 4140

Influence of plasma nitriding treatment on the adhesion of DLC films deposited on AISI 4140 steel by PVD magnetron sputtering

2017 ◽  
Vol 31 (18) ◽  
pp. 2015-2027 ◽  
Author(s):  
Halim Kovacı ◽  
Özlem Baran ◽  
Özgü Bayrak ◽  
Ali Fatih Yetim ◽  
Ayhan Çelik
Keyword(s):  
Magnetron Sputtering ◽  
Plasma Nitriding ◽  
Aisi 4140 Steel ◽  
Aisi 4140
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