Mr.Mahesh B.Davanageri - Academia.edu (original) (raw)

Papers by Mr.Mahesh B.Davanageri

Applied Sciences

The present work aims at cost-effective approaches for biodiesel conversion from niger seed (NS) ... more The present work aims at cost-effective approaches for biodiesel conversion from niger seed (NS) oil by employing the transesterification process, Box–Behnken design (BBD), and artificial intelligence (AI) tools. The performances of biodiesel yield are reliant on transesterification variables (methanol-to-oil molar ratio M:O, reaction time Rt, catalyst concentration CC, and reaction temperature RT). BBD matrices representing the transesterification parameters were utilized for experiment reductions, analyzing factor (individual and interaction) effects, deriving empirical equations, and evaluating prediction accuracy. M:O showed a dominant effect, followed by CC, Rt, and RT, respectively. All two-factor interaction effects are significant, excluding the two interactions (Rt with RT and M:O with RT). The model showed a good correlation or regression coefficient with a value equal to 0.9869. Furthermore, the model produced the best fit, corresponding to the experimental and predicted ...

IOP Conference Series: Materials Science and Engineering, 2021

The present study is to investigate the influence of ageing time on the microstructure, hardness ... more The present study is to investigate the influence of ageing time on the microstructure, hardness and corrosion properties of UNS Zeron 100 super duplex stainless steel. The material was solution treated at 1050°C and water quenched, further the ageing has been carried out at 850°C for 30, 60 and 90 minutes. Hardness test and corrosion test were carried out for both solution treated as well as aged specimens for different ageing period. Results of hardness test indicate an increase in hardness as the ageing period increases. Corrosion test results showed good resistance to corrosion as the ageing time increases. Changes in mechanical properties were observed due to sigma phase formation. Scanning electron microscope (SEM) analysis showed the sigma phase precipitation in duplex stainless steel. EDX analysis shows the consumption of ferrite and formation of chromium which indicates the formation of sigma phase. Optical image analysis showed the increment of sigma phase as the ageing time is increased.

American Journal of Materials Science, 2016

The aim of this present work is to investigate the dry sliding wear behavior of 17-4 PH stainless... more The aim of this present work is to investigate the dry sliding wear behavior of 17-4 PH stainless steel or AISI 630 hardened by precipitation hardening. The sliding wear tests were conducted with the use of a pin-on-disc tribometer by considering three factors viz., normal load (20N, 40N and 60N), sliding distances (400m, 600m and 800 m) and sliding velocity (3, 5 and 7 m/s). The analysis of wear volume loss and specific wear rate has been defined by the Taguchi methodology and analysis of variance using statistical software MINITAB 15. Signal to noise ratio shows that, among the factors the load is the most significant factor that affects wear volume loss and specific wear rate.

American Journal of Materials Science, 2015

In the present work the microstructure, hardness and wear behavior of super duplex stainless AISI... more In the present work the microstructure, hardness and wear behavior of super duplex stainless AISI 2507 were investigated when it was exposed to heat treatment 850°C for one hour followed by water and oil quenching. It was found that heat treatment at 850°C duplex stainless steel precipitates secondary phase sigma (𝜎𝜎). The sigma (𝜎𝜎) phase is a tetragonal crystal structure, originated from the phase transformation of ferrite to 𝜎𝜎 phase. When the ferrite to sigma (𝜎𝜎) phase transformation occurs, the 𝜎𝜎 phase will precipitate in the high Cr-concentrated region of 𝛿𝛿-ferrite and is formed directly in 𝛿𝛿-ferrite particles. The sigma (𝜎𝜎) phase increases the hardness. The increase in hardness was found to be directly correlated with the precipitation of sigma phase in the microstructure. The microstructures of heat treated samples were examined using scanning electron microscope and X-ray diffraction analysis (XRD) and both confirm the precipitation of sigma phase. The hardness and Wea...

Materials Today: Proceedings, 2017

In this paper, the wear behaviour of heat treated (oil and water quenched) super duplex stainless... more In this paper, the wear behaviour of heat treated (oil and water quenched) super duplex stainless steel (SDSS) AISI 2507 was studied using dry sliding wear test rig. Initially as received materials was solution treated at 1050°C for duration of 2 h to achieve a balanced austenite (γ) and ferrite (δ) microstructure. The effect of different heat treatment techniques on microstructure and wear behaviour was studied by heat treating specimen at 850°C for duration of 1 h and was followed by oil and water quenching. The microstructure and crystal structure were studied through scanning electron microscope (SEM) and X-ray diffraction. The sliding wear test was employed with variation in load and speed at constant sliding distance. The results reveal that wear rate increased with increase in wear parameters. The oil quenched exhibited better wear resistance than water quenched and solution treated specimen. The worn surface morphology were analysed through SEM micrographs.

IOSR Journal of Mechanical and Civil Engineering, 2014

The unique and diverse characteristics of composite materials have increased in many folds. From ... more The unique and diverse characteristics of composite materials have increased in many folds. From feather weight rods to high performance aircraft parts, the use fiber reinforced materials have become a compelling asset due to their high strength to weight ratio and high strength to stiffness ratio combined with easy manufacturing methods. The present endeavor is one such attempt to study the mechanical properties of glass fiber reinforced plastic (GFRP) by varying volume percentage. The mechanical properties involved in the study are tensile strength, bending strength and impact strength. The results are compared for different loading conditions and a suitable composition is selected for the fabrication of mono composite leaf spring. The study concluded that the composite leaf spring had induced stresses much lower than that of steel leaf spring and the spring weight was nearly 44% lower when compared to steel leaf spring.

National Conference on Challenges in Research & Technology in the Coming Decades (CRT 2013), 2013

ABSTRACT The duplex stainless steel (DSS) is a two phase microstructure of about equal proportion... more ABSTRACT The duplex stainless steel (DSS) is a two phase microstructure of about equal proportion of austenite (chromiumnickel) and ferrite (chromium). Austenite is ductile in nature and ferrite is brittle in nature, this combination provides an excellent mechanical properties (hardness, impact toughness etc) and corrosion resistance [1]. This paper deals with the study of dry sliding wear of Lean duplex stainless steel (AISI 304) and super duplex stainless steel (AISI 310) as a function of heat treatment conditions. The wear test specimens were heat treated at 850°C and followed by oil quenching. These wear tests are carried out using pin on disk technique at; (i) constant sliding velocity and different sliding distances, (ii) constant sliding distance and different sliding velocity and (iii) varying load and the weight loss methodology is used to calculate the wear volume. Results related to the AISI 304 wear showed that the hardness introduced due to the presence of sigma phase plays an important role on wear behavior for this type of steel.

Applied Mechanics and Materials, 2013

The effect of solution and aging temperatures on microstructure and tensile property of Ti-5Al-5M... more The effect of solution and aging temperatures on microstructure and tensile property of Ti-5Al-5Mo-5V-3Cr-1Fe Alloy was investigated. The results showed that the tensile strength lowered, when the solution and aging temperature rose respectively. The alloy with different heat treatments showed better tensile strength totally, i.e. the minimum level of ultimate and yield strength passed 1280 MPa and 1245MPa. The highest ultimate tensile strength could reach 1445 MPa. After (α+β) solution and aging treatment, the microstructure consists of primary α phase and transformed β phase with fine secondary α phase precipitating to improve the tensile strength effectively.

AIP Conference Proceedings, 2019

In this work, the effect of heat treatment on the mechanical properties and the microstructure of... more In this work, the effect of heat treatment on the mechanical properties and the microstructure of heat treated aluminium alloy LM 25 (Al-Si7-Mg) as well as on the metal matrix composite (LM 25), reinforced with tungsten carbide (WC) has been experimentally studied. The composites were fabricated through Stir Casting Method with LM 25 as matrix material and tungsten carbide (WC) with 0%, 3%, 6% and 9% by weight as reinforcement material. The specimens were made as per ASTM standards in order to test for its tensile strength, hardness and wear performance. It is observed that LM 25 alloy aged at 150°C has better mechanical properties. Significant improvement in tensile strength and hardness is observed with addition of WC as reinforcement. The results show up to 30% improvement in wear strength of 6% and 9% wt WC when compared to 0%wt WC. The property enhancement of the composites can be achieved by adding WC in to LM 25.

Materials Research Express

The effect of ageing time on hardness, microstructure and wear behaviour of super duplex stainles... more The effect of ageing time on hardness, microstructure and wear behaviour of super duplex stainless AISI 2507 is examined. The material was solution treated at 1050 °C and water quenched, further the ageing has been carried out at 850 °C for 30 min, 60 min and 90 min. The chromium (Cr) and molybdenum (Mo) enriched intermetallic sigma phase (σ) were found to precipitate at the ferrite/austenite interface and within the ferrite region. The concentration of intermetallic sigma phase (σ), which was quantified by a combination of scanning electron microscopy and image analysis, increases with increasing ageing time, leading to significant increase in the hardness. The x-ray diffraction (XRD) and energy dispersive x-ray (EDX) was employed to investigate the element distribution and phase identification. Wear characterstics of the aged super duplex stainless steel were measured by varying normal loads, sliding speeds, sliding distance and compared with solution treated (as-cast) specimens. Scanning electron microscopy was used to assist in analysis of worn out surfaces. The outcomes suggested that the increase in percentage of sigma phase increases hardness and wear resistance in heat-treated specimens compared to solution treated specimens (as-cast).

Journal of Mechanical Engineering and Automation, 2017

The present work aimed to determine the mechanical and vibration characteristics of Glass/Epoxy c... more The present work aimed to determine the mechanical and vibration characteristics of Glass/Epoxy composite with Mother of Pearl as secondary reinforcing material (filler material). The secondary material percentage was varied for three different compositions i.e., for composite with 5%, 10% and 15% weight percentage of filler material. The results showed that the Composite reinforced with 5% filler material yielded better results for Tension, whereas the composite reinforced with 15% filler material gave better results for Flexural and Vibration tests. The Experimental results were further verified by Analytical method using Nastran Software. The Experimental and Analytical results showed agreement with each other.

Archives of Foundry Engineering, 2016

The dry sliding wear behavior of heat-treated super duplex stainless steel AISI 2507 was examined... more The dry sliding wear behavior of heat-treated super duplex stainless steel AISI 2507 was examined by taking pin-on-disc type of wear-test rig. Independent parameters, namely applied load, sliding distance, and sliding speed, influence mainly the wear rate of super duplex stainless steel. The said material was heat treated to a temperature of 850°C for 1 hour followed by water quenching. The heat treatment was carried out to precipitate the secondary sigma phase formation. Experiments were conducted to study the influence of independent parameters set at three factor levels using the L

IOP Conference Series: Materials Science and Engineering

In this paper the finite element simulation approach has been employed for the work that has been... more In this paper the finite element simulation approach has been employed for the work that has been recently carried out by Davanageri et al.(2017). The super duplex stainless steel AISI 2507 material was heat treated at 850°C with different ageing time (30, 60, 90 minutes), followed by water quench. The heat treatment was carried out to encourage the precipitation of inter-metallic secondary sigma phase (σ). The study of dry sliding wear behavior was carried out with the pin-on-disc equipment. The heat treatment and ageing time increases the hardness of the duplex steel, resulting in improved wear resistance. The Archard wear model and finite element software ANSYS WORKBENCH-16 was used to determine the wear volume loss. The specific wear rate or dimensional wear coefficient is the most significant factor in the wear volume calculation and it varies with material and operating parameters. The study shows that frictional coefficient varies with material properties (hardness) at similar operating condition. Finally the results reveal that there is a good agreement that exists between the simulated (FE) values and those of the experimental values.

Materials Today: Proceedings

Polymer matrix composites are emerging as promising materials in many engineering materials. In t... more Polymer matrix composites are emerging as promising materials in many engineering materials. In the present study, mechanical behaviour of glass/epoxy composites with varied volume fraction of hematite filler has been investigated. The composites were prepared by hand lay-up technique. The mechanical properties viz. tensile behaviour, flexural behaviour, impact behaviour, hardness behaviour are investigated. The tensile test and flexural test has been carried out using Universal Testing Machine, impact test has been carried out using Charpy method, hardness test has been done by BHN method. The objective was to investigate influence of hematite filler on mechanical characteristics of glass/epoxy composites. The obtained results revealed that hematitie filled composites exhibited better than unfilled glass/epoxy composites. The 10% hematite filled glass/epoxy composites has shown superior to other studied composites.

Procedia Materials Science, 2014

ABSTRACT Machining of fiber reinforced plastic (FRP) composite materials is an alarmingly fast de... more ABSTRACT Machining of fiber reinforced plastic (FRP) composite materials is an alarmingly fast developing area in the recent years. Drilling of composite materials as a machining operation is a field open to a plethora of questions. The Delamination induced by drilling acts as a hindrance to the application, as the hole acts as a stress concentrating layout leading to failure during loading. Granite fiber reinforced epoxy composites are a class of composites that are highly reliable due to their effective strength-to-weight ratio and stiffness-to-weight ratio. The present research endeavour is an effort to investigate the influence of process parameters such as feed and cutting speed during drilling of Granite fiber reinforced composites. Standard array, Analysis of Variance (ANOVA) and response surface methodology are used to conduct investigations based on the experimental results. Mathematical models for thrust force, torque, and Delamination are proposed that agree well with the experimental values.

Composite materials are the class of materials which has lot of scope in the field of several eng... more Composite materials are the class of materials which has lot of scope in the field of several engineering applications such as structural, transport etc. But its application has limited because 100% replacement of composite with conventional metals/alloys is not possible while considering the properties. Lot of research and study is needed in this regard to develop the composite material as a promising material that is comparable with conventional metals/alloys. Attempt has been made in this work to develop and characterize epoxy based e-glass and asbestos powder filled composites by varying the asbestos powder from varying from 0 to6 vol. % in the epoxy matrix by hand layup technique.