Search results for: B. P. Kashyap

Items from 1 to 20 out of 24 results

article

Effects of Temporary Alloying and Severe Plastic Deformation on Microstructure Evolution and Mechanical Properties of Ti-Alloys: A Comparative Study

S. M. Jagadeesh Babu, S. V. S. Narayana Murty, N. Prabhu, R. Kapoor, more

Transactions of the Indian Institute of Metals > 2019 > 72 > 6 > 1421-1425

Near-α (VT 20) and α + β (Ti–6Al–4V) Ti alloys having similar initial grain morphology with equiaxed α in transformed β were subjected to microstructure refinement processes by thermohydrogen processing (THP) and caliber rolling (CR), respectively. The microstructure analysis after THP and CR of the alloys revealed the change in morphology and refinement of microstructure. The microstructure analysis...

article

Effect of Strain Rate and Temperature on the Tensile Flow Behavior and Microstructure Evolution in Fe-0.3 Pct C-CrMoV Grade Steel

G. Dilip Chandra Kumar, V. Anil Kumar, R. K. Gupta, S. V. S. Narayana Murty, more

Metallurgical and Materials Transactions A > 2019 > 50 > 1 > 161-178

The effect of temperature and strain rate on the tensile flow behavior of Fe-0.3 pct C-CrMoV grade steel was studied over a wide range of strain rates (10⁻⁴ to 10⁻¹ s⁻¹) and temperatures (700 °C to 950 °C). The flow curves of the steel showed typical dynamic recovery (DRV)-type characteristics at low temperature, high strain rate, and dynamic recrystallization (DRX) type at high temperature > 775 °C...

article

Effect of Solid Die Equi-Channel Pressing Angle on β-Mg₁₇Al₁₂ Phase Morphology and Mechanical Behavior of AZ80 Mg alloy

Pabitra Palai, N. Prabhu, B. P. Kashyap

Journal of Materials Engineering and Performance > 2017 > 26 > 4 > 1825-1829

The effects of die channel angle (Φ) in hot (~623 K) equi-channel angular pressing (ECAP) on microstructure, and tensile and compressive flow properties of AZ80 Mg alloy were investigated. Two solid ECAP dies, having Φ of (1) dual 60° and 120° in a single die and (2) 90° in another die, were designed for this purpose. Grain refinement with more than 40% reduction in average grain size along with submicron...

article

On the High Temperature Deformation Behaviour of 2507 Super Duplex Stainless Steel

M. K. Mishra, I. Balasundar, A. G. Rao, B. P. Kashyap, more

Journal of Materials Engineering and Performance > 2017 > 26 > 2 > 802-812

High temperature deformation behaviour of 2507 super duplex stainless steel was investigated by conducting isothermal hot compression tests. The dominant restoration processes in ferrite and austenite phases present in the material were found to be distinct. The possible causes for these differences are discussed. Based on the dynamic materials model, processing map was developed to identify the optimum...

article

Effect of Multipass Friction Stir Processing on Mechanical and Corrosion Behavior of 2507 Super Duplex Stainless Steel

M. K. Mishra, G. Gunasekaran, A. G. Rao, B. P. Kashyap, more

Journal of Materials Engineering and Performance > 2017 > 26 > 2 > 849-860

The microstructure, mechanical properties, and corrosion behavior of 2507 super duplex stainless steel after multipass friction stir processing (FSP) were examined. A significant refinement in grain size of both ferrite and austenite was observed in stir zone resulting in improved yield and tensile strength. Electrochemical impedance spectroscopy and anodic polarization studies in 3.5 wt.% NaCl solution...

article

Taguchi Based Optimisation of Artificial Neural Network to Establish a Direct Microstructure: Mechanical Property Correlation in a near-α Titanium Alloy

I. Balasundar, T. Raghu, B. P. Kashyap

Transactions of the Indian Institute of Metals > 2016 > 69 > 10 > 1929-1941

The microstructural features present in titanium alloys not only vary over a wide range of length scale but are also highly interdependent. It is not possible to experimentally study the variation effect of only one microstructural feature while maintaining others at a constant value. Due to this complexity, there are no physical models available to relate the microstructural features to the mechanical...

article

Overview: Experimental Constitutive Relationship for High Temperature Deformation and the Effect of Concurrent Microstructure Evolution

B. P. Kashyap

Transactions of the Indian Institute of Metals > 2016 > 69 > 2 > 463-467

A wide range of superplastic materials were investigated for their high temperature flow property characteristics. Depending on the ranges of strain rates, temperatures and grain sizes, there appear 2–3 regimes of stress–strain rate relationship, with distinct values of strain rate sensitivity index, activation energy for deformation and grain size exponent. These parameters of constitutive relationship...

article

Estimation of Creep Failure Life of Rotor Grade Steel by Using Time–Temperature Parametric Methods

M. I. Mehta, B. P. Kashyap, R. K. P. Singh, R. Kadam, more

Transactions of the Indian Institute of Metals > 2016 > 69 > 2 > 591-595

Creep behavior is one of the most critical factors determining the failure life of components at elevated temperature. Turbine rotor shaft is subjected to such elevated conditions. The creep behavior of rotor grade steel 28CrNiMoV59 was studied at elevated temperatures from 550 to 650 °C and at stress levels varying from 120 to 300 MPa. Tensile tests were conducted to determine the basic properties...

article

Effect of Preaging Deformation on Aging Characteristics of 2507 Super Duplex Stainless Steel

M. K. Mishra, A. G. Rao, R. Sarkar, B. P. Kashyap, more

Journal of Materials Engineering and Performance > 2016 > 25 > 2 > 374-381

In the present study, precipitation of sigma (σ) phase was investigated over the temperature range of 700-850 °C in undeformed and deformed (60% cold rolling) samples of 2507 super duplex stainless steel. The fraction of sigma phase formed as a result of the transformation α → σ + γ₂ increases with increasing time and temperature. The increase in sigma phase leads to increase in yield strength and...

article

High-Temperature Tensile Flow Behavior of Caliber-Rolled Mg-3Al-1Zn Alloy

R. L. Doiphode, S. V. S. Narayana Murty, N. Prabhu, B. P. Kashyap

Metallurgical and Materials Transactions A > 2015 > 46 > 7 > 3028-3042

Mg-3Al-1Zn (AZ31) alloy was caliber rolled isothermally in the temperature range of 523 K to 723 K (250 °C to 450 °C) to develop fine grains of 3 to 13 µm. Tensile tests by constant initial strain rate as well as differential strain rate test techniques were conducted over the temperature range of 493 K to 723 K (220 °C to 450 °C) and strain rate range of 10⁻⁵ to 10⁻¹ s⁻¹. Maximum tensile elongation...

article

Microstructure and Texture Evolution During Annealing of Caliber Rolled Mg–3Al–1Zn Alloy

R. L. Doiphode, S. V. S. Narayana Murty, N. Prabhu, B. P. Kashyap

Transactions of the Indian Institute of Metals > 2015 > 68 > 2 > 317-321

Mg–3Al–1Zn (AZ31) alloy was caliber rolled isothermally at the temperature of 300 °C to develop fine grains of 3 µm size. The microstructure and texture evolution of caliber rolled bar during annealing at 300 °C was investigated for 5 to 6000 min. The grain growth from 6 to 17 µm was observed. The grain growth was noted to be faster initially but it became sluggish after ~60 min of annealing. The...

article

Biocorrosion and biodegradation behavior of ultralight Mg–4Li–1Ca (LC41) alloy in simulated body fluid for degradable implant applications

S. S. Nene, B. P. Kashyap, N. Prabhu, Y. Estrin, more

Journal of Materials Science > 2015 > 50 > 8 > 3041-3050

Biocorrosion and biodegradation behavior of Mg–4Li–1Ca alloy were investigated for industrially important end product conditions, namely the homogenized, rolled, and rolled + annealed ones. Among the three, homogenized material showed the highest corrosion rate (27.2 mm/year) in a simulated body fluid (SBF) owing to its coarse grain structure containing long dumbbell-shaped eutectic phase....

article

Processing map for a cast and homogenized near alpha titanium alloy

I. Balasundar, T. Raghu, B. P. Kashyap

International Journal of Material Forming > 2015 > 8 > 1 > 85-97

The high temperature deformation behaviour of cast and homogenised near α titanium alloy Titan 29A (M/s MIDHANI, India), equivalent to IMI 834 (M/s TIMET, UK) was studied towards developing a processing map. The processing map is interpreted in terms of the microstructural changes occurring during deformation, based on the values of a dimensionless parameter η which represents the energy dissipation...

article

Hot Workability and Flow Characteristics of Aluminum-5 wt.% B₄C Composite

S. Gangolu, A. G. Rao, N. Prabhu, V. P. Deshmukh, more

Journal of Materials Engineering and Performance > 2014 > 23 > 4 > 1366-1373

Flow behavior of aluminum-5 wt.% boron carbide (Al-B₄C) composite was investigated by carrying out compression tests over a range of strain rates (10⁻⁴-10⁰ s⁻¹) and temperatures (200-500 °C). The flow stress data obtained from these tests at true strain 0.5 were used to develop processing map. The stable and instable flow regimes in the map were characterized by the microstructural examination using...

article

Grain Growth and β-Mg₁₇Al₁₂ Intermetallic Phase Dissolution During Heat Treatment and Its Impact on Deformation Behavior of AZ80 Mg-Alloy

P. Palai, N. Prabhu, P. D. Hodgson, B. P. Kashyap

Journal of Materials Engineering and Performance > 2014 > 23 > 1 > 77-82

Microstructure evolution after solutionizing and ageing treatment of cast AZ80 Mg alloy were investigated using optical and scanning electron microscopy. Effect of these treatments on grain size, β-Mg₁₇Al₁₂ intermetallic phase, mechanical behavior, and flow asymmetry were investigated. The initial continuous network of β-phase found to be reduced after solutionizing. The dissolution of β-phase and...

article

Recrystallization Phenomena During Friction Stir Processing of Hypereutectic Aluminum-Silicon Alloy

A. G. Rao, K. R. Ravi, B. Ramakrishnarao, V. P. Deshmukh, more

Metallurgical and Materials Transactions A > 2013 > 44 > 3 > 1519-1529

Microstructural evolution and related dynamic recrystallization phenomena were investigated in overlapping multipass friction stir processing (FSP) of hypereutectic Al-30 pct Si alloy. FSP resulted in the elimination of porosities along with the refinement of primary silicon particles and alpha aluminum grains. These alpha aluminum grains predominantly exhibit high angle boundaries with various degrees...

article

Dynamic Recrystallization during Hot Deformation of 304 Austenitic Stainless Steel

A. Marchattiwar, A. Sarkar, J. K. Chakravartty, B. P. Kashyap

Journal of Materials Engineering and Performance > 2013 > 22 > 8 > 2168-2175

The kinetics of dynamic recrystallization (DRX) during hot compression of 304 austenitic stainless steel was studied over the temperature range of 900-1200 °C and strain rate range of 0.002-0.1 s⁻¹. The initiation and evolution of DRX were investigated using the process variables derived from flow curves. By the regression analysis for conventional hyperbolic sine equation, the activation energy for...

article

Microstructure and yield behavior of a high aluminum containing Ti-Al-Nb alloy

Archana G. Paradkar, V. K. Varma, Vydeshi Joshi, T. K. Nandy, more

Metallurgical and Materials Transactions A > 2002 > 33 > 8 > 2763-2766

article

Processing maps for hot deformation of α₂ aluminide alloy Ti-24Al-11Nb

S. V. S. Narayana Murty, B. Nageswara Rao, B. P. Kashyap

Journal of Materials Science > 2002 > 37 > 6 > 1197-1201

Using the test data of α₂ titanium aluminide alloy Ti-24Al-11Nb with microstructural observations, studies are made to examine the flow localization concepts as well as the simplified metallurgical stability criterion for delineating the regions of flow instabilities in the processing maps. The optimum hot working conditions for the material are suggested.

article

Microstructural instability and superplasticity in a Zr-2.5 Wt Pct Nb pressure-tube alloy

R. N. Singh, R. Kishore, T. K. Sinha, A. K. Singh, more

Metallurgical and Materials Transactions A > 2001 > 32 > 11 > 2827-2840

The effect of microstructural evolution on superplastic deformation parameters, such as the nature of σ-ε plots, strain-rate sensitivity parameter, and activation energy, were studied for unstable and thermally stable microstructures of a Zr-2.5 wt pct Nb pressure-tube alloy. Two types of differential strain-rate tests (increasing temperature (IT) and decreasing temperature (DT), in the temperature...

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Search results for: B. P. Kashyap

Effects of Temporary Alloying and Severe Plastic Deformation on Microstructure Evolution and Mechanical Properties of Ti-Alloys: A Comparative Study

Effect of Strain Rate and Temperature on the Tensile Flow Behavior and Microstructure Evolution in Fe-0.3 Pct C-CrMoV Grade Steel

Effect of Solid Die Equi-Channel Pressing Angle on β-Mg₁₇Al₁₂ Phase Morphology and Mechanical Behavior of AZ80 Mg alloy

On the High Temperature Deformation Behaviour of 2507 Super Duplex Stainless Steel

Effect of Multipass Friction Stir Processing on Mechanical and Corrosion Behavior of 2507 Super Duplex Stainless Steel

Taguchi Based Optimisation of Artificial Neural Network to Establish a Direct Microstructure: Mechanical Property Correlation in a near-α Titanium Alloy

Overview: Experimental Constitutive Relationship for High Temperature Deformation and the Effect of Concurrent Microstructure Evolution

Estimation of Creep Failure Life of Rotor Grade Steel by Using Time–Temperature Parametric Methods

Effect of Preaging Deformation on Aging Characteristics of 2507 Super Duplex Stainless Steel

High-Temperature Tensile Flow Behavior of Caliber-Rolled Mg-3Al-1Zn Alloy

Microstructure and Texture Evolution During Annealing of Caliber Rolled Mg–3Al–1Zn Alloy

Biocorrosion and biodegradation behavior of ultralight Mg–4Li–1Ca (LC41) alloy in simulated body fluid for degradable implant applications

Processing map for a cast and homogenized near alpha titanium alloy

Hot Workability and Flow Characteristics of Aluminum-5 wt.% B₄C Composite

Grain Growth and β-Mg₁₇Al₁₂ Intermetallic Phase Dissolution During Heat Treatment and Its Impact on Deformation Behavior of AZ80 Mg-Alloy

Recrystallization Phenomena During Friction Stir Processing of Hypereutectic Aluminum-Silicon Alloy

Dynamic Recrystallization during Hot Deformation of 304 Austenitic Stainless Steel

Microstructure and yield behavior of a high aluminum containing Ti-Al-Nb alloy

Processing maps for hot deformation of α₂ aluminide alloy Ti-24Al-11Nb

Microstructural instability and superplasticity in a Zr-2.5 Wt Pct Nb pressure-tube alloy

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