Investigation of HVOF processed carbide based coating on AISI-4340

Padmavathi, G.; Sarada, B.N.; Shanmuganathan, Sp.; Krishnamurthy, R.; Padmini, B.V.

doi:10.1063/5.0036544

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…An increase in porosity leads to higher water absorption percentage. The melting of the metal and rarefaction between chromium oxide granules effectively block a significant number of pores, resulting in reduced absorbency [46]. 6.1.3.…”

Section: Thermal Conductivity Testmentioning

confidence: 99%

Production of a double cermet coating to treatment of the turbine blades

Antar,

Darweesh,

Ridha

2024

Eng. Res. Express

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Turbine blades often experience external failures, such as cracks and high pores, during operation. To address these issues, a method known as thermal spraying by flame is employed to apply cermet materials consisting of metal and ceramics onto the blades. The process involved incorporating manganese (Mn) into a chromium oxide (Cr2O3) base in varying proportions (3,6,9,12,15)%. Prior to this, the two mixtures underwent several preparatory steps, including being mixed with a micro-mill for two hours and then dried at 80°C for thirty minutes to remove any moisture present in the laboratory. The coating bases were prepared from an out-of-service turbine bit and shaped into squares with a side length of 1cm. The bases were then roughened and indented using a paint gun. The resulting models were sintered at a temperature of 1000°C for two hours. A number of structural and physical tests were carried out for the painted models before and after thermal sintering. Scanning electron microscope tests revealed crystalline regularity and lattice consistency of the outer surface especially at 15%Mn. Regarding the findings of the actual density, it was observed that the inclusion of manganese leads to a gradual enhancement in density with each subsequent addition. However, there was a consistent decrease in real porosity and water absorption, resulting in lower values at 15%. The hardness and adhesion strength exhibited significant improvements, increasing by approximately 15%. Conversely, the addition of the stiffener led to a continuous decrease in thermal conductivity. Thus, it was determined that the optimal coating parameters for achieving favorable outcomes were a coating distance of 16cm, a coating angle of 90°, and thermal sintering at 1000°C.

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Section: Thermal Conductivity Testmentioning

confidence: 99%

Production of a double cermet coating to treatment of the turbine blades

Antar,

Darweesh,

Ridha

2024

Eng. Res. Express

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“…The Taguchi method was used to identify the optimum levels of wear parameters of AISI 4340 steel under different testing situations such as carried out load, sliding distance, and sliding velocity. The results reveal that a lower wear charge is done when the most dependable parameter placement (load, sliding speed, and sliding distance) is used [11][12][13][14]. The wear and tear resistance of AISI 4340 steel lined with Tungsten carbide and Chromium carbide-primarily based coatings deposition utilizing HVOF technology was explored and analyzed using the Pin-on-Disc technique, and the influence of floor modification on the wear conduct was investigated.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Multi-Walled Carbon Nanotubes Additives on the Tribological Properties of Austempered AISI 4340 Steel

Sultan¹,

Karash²,

Abdulrazzaq³

et al. 2022

JESA

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Due to a combination of optimal properties such as great strength, high hardness, good process ability, and good mechanical properties, AISI 4340 steel is widely used in many critical industrial applications such as nuclear, military, defense, and aerospace. It is also widely used in hydraulic forged machine tools, forged automotive crankshaft systems, shafts and gears, because of their improved characteristics, and its good tribological properties. The purpose regarding this work is to check the tribological characteristics of austempered AISI 4340 steel while dry and lubricated with machinery oil of SAE 30 grade as base oil. As received, AISI 4340 steel samples have been austempered to four definitely austenitic phase temperatures (850℃, 900℃, 1000℃, and 1050℃) for 90 minutes before being immersed in a mixture of potassium nitrite and sodium nitrite at 400℃ for 45 minutes. Friction and wear tests were then performed on austempered samples. Multi-walled carbon nanotube particles were blended at weight concentrations of 0.055, 0.1, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, and 0.45 with typical machinery oil of 30 grade as base lubricant oil. A pin on the disc wear configuration was used in the experimental investigation. The use of Multi-Walled Carbon Nanotube (MWCNTs) additives in the base oil resulted in a decrease in both friction coefficients and wear rates values when compared to typical base oil lubricant. The results also showed a reduction in both friction coefficients and wear rates as the sample's austempering temperatures were raised. Sliding surfaces were also photo micro graphed, and when the volume concentrations of Multi-Walled Carbon Nanotube particles in the normal base oil lubricant were increased, smoother surfaces with less damage were shown.

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Experimental Study on the Influence of TiN/AlTiN PVD Layer on the Surface Characteristics of Hot Work Tool Steel

et al. 2021

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It is desirable to improve tool steel wear resistance to produce pieces with precise dimensions and increase the lifetime of tools. The aim of this work was to modify the surface of 1.2344 (X40CrMoV5-1) hot work tool steel to improve the wear properties. Surface modification was achieved in three steps: first, hardening was applied, followed by plasma nitridation and, finally, physical vapor deposition (PVD) was employed to produce a TiN/AlTiN multilayer coating. The microhardness and the wear coefficient of the surfaces were measured. PVD coating showed the highest hardness value, 2938 HV0,01, whereas plasma nitridation followed by PVD resulted in 2679 HV0,01. The surface modification resulted in an increase in surface roughness in all cases compared to the hardened sample. However, the wear coefficient showed a significant decrease for the surface treated samples. The lowest wear coefficient of K = 1.47 10–10 mm3/Nm, which is a magnitude lower than the reference hardened sample (K = 6.32 10–9 mm3/Nm), was achieved employing both plasma nitridation and PVD. The results confirm that the use of a combined surface modification of plasma nitridation and PVD significantly improve the wear resistance of the treated samples.

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Investigation of HVOF processed carbide based coating on AISI-4340

Cited by 3 publications

References 21 publications

Production of a double cermet coating to treatment of the turbine blades

Production of a double cermet coating to treatment of the turbine blades

The Effect of Multi-Walled Carbon Nanotubes Additives on the Tribological Properties of Austempered AISI 4340 Steel

Experimental Study on the Influence of TiN/AlTiN PVD Layer on the Surface Characteristics of Hot Work Tool Steel

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