Search results for: P. Wanjara

Items from 1 to 20 out of 45 results

article

Linear Friction Welding of Dissimilar Materials 316L Stainless Steel to Zircaloy-4

P. Wanjara, B. S. Naik, Q. Yang, X. Cao, more

Metallurgical and Materials Transactions A > 2018 > 49 > 5 > 1641-1652

In the nuclear industry, there are a number of applications where the transition of stainless steel to Zircaloy is of technological importance. However, due to the differences in their properties there are considerable challenges associated with developing a joining process that will sufficiently limit the heat input and welding time—so as to minimize the extent of interaction at the joint interface...

article

Residual stress analysis in linear friction welded in-service Inconel 718 superalloy via neutron diffraction and contour method approaches

M. Smith, J.-B. Levesque, L. Bichler, D. Sediako, more

Materials Science and Engineering: A > 2017 > 691 > C > 168-179

In this study, an analysis of elastic residual stress in Inconel^® 718 (IN 718) linear friction welds (LFWs) was carried out. In particular, the suitability of LFW for manufacturing and repair of aero engine components was emulated by joining virgin and in-service (extracted from a turbine disk) materials. The evolution in the residual strains and stresses in the heat-affected zone (HAZ), thermomechanically...

article

Mechanical properties of electron beam welds in heavy-section UNS S41500 martensitic stainless steel

S. Sarafan, P. Wanjara, J. Gholipour, H. Champliaud, more

The International Journal of Advanced Manufacturing Technology > 2017 > 91 > 9-12 > 4141-4150

Single pass autogenous butt welds, without detectable volumetric defects, were manufactured by electron beam welding 90-mm-thick UNS S41500—a low carbon 13% Cr-4% Ni martensitic stainless steel typically used for hydroelectric turbine applications. The mechanical properties of the joints were evaluated in the as-welded condition by tensile testing, Charpy V-notch testing, and bend testing. Specifically,...

article

Phase structures and morphologies of tempered CA6NM stainless steel welded by hybrid laser-arc process

F. Mirakhorli, X. Cao, X-T. Pham, P. Wanjara, more

Materials Characterization > 2017 > 123 > C > 264-274

The post-weld tempered microstructure of hybrid laser-arc welded CA6NM, a cast low carbon martensitic stainless steel, was investigated. The microstructural evolutions from the fusion zone to the base metal were characterized in detail using optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and microhardness techniques. The fusion...

article

Mechanical properties and microstructural evolution of in-service Inconel 718 superalloy repaired by linear friction welding

M. Smith, L. Bichler, J. Gholipour, P. Wanjara

The International Journal of Advanced Manufacturing Technology > 2017 > 90 > 5-8 > 1931-1946

The focus of this study was to evaluate the possibility of extending the service life of an Inconel® alloy 718 (IN 718) aero-engine turbine using the linear friction welding (LFW) process. In particular, the repair of a blade integrated disk (BLISK) through replacement of blades damaged in-service was emulated by LFW virgin IN 718 to in-service IN 718. The virgin–in-service (V–IS) welds were then...

article

Global and local characteristics of an autogenous single pass electron beam weld in thick gage UNS S41500 steel

S. Sarafan, P. Wanjara, J. Gholipour, H. Champliaud

Materials Science and Engineering: A > 2016 > 666 > C > 360-371

Electron beam welding of UNS S41500, a low carbon martensitic stainless steel utilized in hydroelectric turbine manufacturing, was investigated by applying a single pass autogenous process to penetrate a section thickness of 72mm without preheating. In the as-welded and post-weld heat treated conditions, the evolution in microhardness and microstructure across the weldments, as well as the global...

article

Mechanical and Metallurgical Evolution of Stainless Steel 321 in a Multi-step Forming Process

M. Anderson, F. Bridier, J. Gholipour, M. Jahazi, more

Journal of Materials Engineering and Performance > 2016 > 25 > 4 > 1526-1538

This paper examines the metallurgical evolution of AISI Stainless Steel 321 (SS 321) during multi-step forming, a process that involves cycles of deformation with intermediate heat treatment steps. The multi-step forming process was simulated by implementing interrupted uniaxial tensile testing experiments. Evolution of the mechanical properties as well as the microstructural features, such as twins...

article

Extension of flow stress–strain curves of aerospace alloys after necking

M. Saboori, H. Champliaud, J. Gholipour, A. Gakwaya, more

The International Journal of Advanced Manufacturing Technology > 2016 > 83 > 1-4 > 313-323

To define accurately the expansion limits of aerospace materials, determination of the material behavior before and after the onset of necking, as well as the failure threshold are essential requirements. The plastic flow behavior before necking (pre-necking phase) has been fully identified by various mathematical models, such as Hollomon and Swift constitutive equations, but a criterion to satisfy...

article

Analysis of integrity and microstructure of linear friction welded Waspaloy

A. Chamanfar, M. Jahazi, J. Gholipour, P. Wanjara, more

Materials Characterization > 2015 > 104 > Complete > 149-161

Nickel-base superalloy, Waspaloy, was linear friction welded (LFWed) under different axial shortening conditions of 2.0, 3.4, and 4.6mm. The tensile properties and microhardness of the weldments were investigated in the as-LFWed condition and compared with those in the post-weld heat treated (PWHTed) condition. Mechanical properties were related to microstructures following examination by optical...

article

Characteristics of an autogenous single pass electron beam weld in thick gage CA6NM steel

S. Sarafan, P. Wanjara, H. Champliaud, D. Thibault

The International Journal of Advanced Manufacturing Technology > 2015 > 78 > 9-12 > 1523-1535

CA6NM is a low carbon martensitic stainless steel that is widely applied in hydroelectric turbine manufacturing. Using conventional fusion welding techniques, the fabrication of a thick section in CA6NM requires a V-groove joint design and multiple passes to achieve the required penetration. However, exposure to a substantial heat input through this process renders large fusion and heat-affected zones,...

article

High and low cycle fatigue behavior of linear friction welded Ti–6Al–4V

J.C. Stinville, F. Bridier, D. Ponsen, P. Wanjara, more

International Journal of Fatigue > 2015 > 70 > C > 278-288

Linear friction welded Ti–6Al–4V was investigated in fatigue at various stress amplitudes ranging from the high cycle fatigue (HCF) to the low cycle fatigue (LCF) regime. The base material was composed of hot-rolled Ti–6Al–4V plate that presented a strong crystallographic texture. The welds were characterized in terms of microstructure using electron backscatter diffraction and hardness measurements...

article

Evolution of flow stress and microstructure during isothermal compression of Waspaloy

A. Chamanfar, M. Jahazi, J. Gholipour, P. Wanjara, more

Materials Science and Engineering: A > 2014 > 615 > C > 497-510

The evolution of the flow stress and microstructure for Waspaloy was studied in the 950–1140°C temperature range under constant true strain rate conditions of 0.001–1s⁻¹ up to a true strain of 0.83 using isothermal hot compression testing. The impact of friction at the sample/anvil interface and adiabatic heating during deformation on the flow stress evolution was also examined. Mathematical models...

article

Evaluating the flow stress of aerospace alloys for tube hydroforming process by free expansion testing

M. Saboori, H. Champliaud, J. Gholipour, A. Gakwaya, more

The International Journal of Advanced Manufacturing Technology > 2014 > 72 > 9-12 > 1275-1286

In order to obtain accurate tube hydroforming (THF) simulation results, one of the important inputs in the finite element model (FEM) of the process is the mechanical response of the material during THF. Generally, the mechanical response is defined by the stress–strain behavior that can be determined from tensile testing of the specimens extracted either from the sheet used for roll forming of the...

article

Texture Development in a Friction Stir Lap-Welded AZ31B Magnesium Alloy

B. S. Naik, D. L. Chen, X. Cao, P. Wanjara

Metallurgical and Materials Transactions A > 2014 > 45 > 10 > 4333-4349

The present study was aimed at characterizing the microstructure, texture, hardness, and tensile properties of an AZ31B-H24 Mg alloy that was friction stir lap welded (FSLWed) at varying tool rotational rates and welding speeds. Friction stir lap welding (FSLW) resulted in the presence of recrystallized grains and an associated hardness drop in the stir zone (SZ). Microstructural investigation showed...

article

Microstructural Analysis of Linear Friction-Welded 718 Plus Superalloy

K. R. Vishwakarma, O. A. Ojo, P. Wanjara, M. C. Chaturvedi

JOM > 2014 > 66 > 12 > 2525-2534

The microstructure of Allvac 718 Plus (718 Plus; ATI, Pittsburgh, PA, USA) superalloy was examined after linear friction welding (LFW) and after standard postweld heat treatment (PWHT). The liquid phase reaction of second-phase precipitates, which are known to constitutionally liquate during conventional fusion welding, was observed in the thermomechanically affected zone (TMAZ) of the welded material...

article

Oxide films in laser additive manufactured Inconel 718

Y.N. Zhang, X. Cao, P. Wanjara, M. Medraj

Acta Materialia > 2013 > 61 > 17 > 6562-6576

A continuous-wave 5kW fiber laser welding system was used in conduction mode to deposit Inconel® alloy 718 (IN718) by employing filler wire on as-serviced IN718 parent material (PM) substrates. The direct laser deposited (DLD) coupons and as-serviced IN718 PM were then evaluated through tensile testing. To understand the failure mechanisms, the tensile fracture surfaces of the as-serviced IN718 PM,...

article

Gap tolerance allowance and robotic operational window for friction stir butt welding of AA6061

P. Wanjara, B. Monsarrat, S. Larose

Journal of Materials Processing Tech. > 2013 > 213 > 4 > 631-640

In this work, it was determined that with increasing weld pitch, the occurrence of a “lazy S” defect in the weld nugget of friction stir welded (FSWed) AA6061 became increasingly pronounced, though its impact on the bend performance of the weld was negligible. For a fixed weld pitch of 0.48, the effect of gap, i.e. the spacing between two sheets at the butt joint interface, on the joint quality of...

article

Lap shear strength and fatigue behavior of friction stir spot welded dissimilar magnesium-to-aluminum joints with adhesive

S.H. Chowdhury, D.L. Chen, S.D. Bhole, X. Cao, more

Materials Science & Engineering A > 2013 > 562 > Complete > 53-60

Lightweighting is currently considered as an effective way in improving fuel efficiency and reducing anthropogenic greenhouse gas emissions. The structural applications of lightweight magnesium and aluminum alloys in the aerospace and automotive sectors unavoidably involve welding and joining while guaranteeing the safety and durability of motor vehicles. The objective of this study was to evaluate...

article

Friction Stir Welded AZ31 Magnesium Alloy: Microstructure, Texture, and Tensile Properties

S. H. Chowdhury, D. L. Chen, S. D. Bhole, X. Cao, more

Metallurgical and Materials Transactions A > 2013 > 44 > 1 > 323-336

This study was aimed at characterizing the microstructure, texture and tensile properties of a friction stir welded AZ31B-H24 Mg alloy with varying tool rotational rates and welding speeds. Friction stir welding (FSW) resulted in the presence of recrystallized grains and the relevant drop in hardness in the stir zone (SZ). The base alloy contained a strong crystallographic texture with basal planes...

article

Microstructure and Fatigue Properties of a Friction Stir Lap Welded Magnesium Alloy

B. S. Naik, D. L. Chen, X. Cao, P. Wanjara

Metallurgical and Materials Transactions A > 2013 > 44 > 8 > 3732-3746

Friction stir welding (FSW), being an enabling solid-state joining technology, can be suitably applied for the assembly of lightweight magnesium (Mg) alloys. In this investigation, friction stir lap welded (FSLWed) joints of AZ31B-H24 Mg alloy were characterized in terms of the welding defects, microstructure, hardness, and fatigue properties at various combinations of tool rotational rates and welding...

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Keywords

MICROSTRUCTURE (8)
ELECTRON BEAM WELDING (6)
LINEAR FRICTION WELDING (4)
FATIGUE PROPERTIES (3)
POST-WELD HEAT TREATMENT (3)
SUPERALLOY (3)
TENSILE PROPERTIES (3)
WASPALOY (3)
ALUMINUM ALLOY (2)
D. WELDING (2)
DIGITAL IMAGE CORRELATION (2)
DYNAMIC RECRYSTALLIZATION (2)
FRICTION STIR SPOT WELDING (2)
FRICTION STIR WELDING (2)
HYPEREUTECTOID STEEL (2)
LAP SHEAR STRENGTH (2)
LASER SCANNING CONFOCAL MICROSCOPY (2)
MAGNESIUM ALLOY (2)
MECHANICAL PROPERTIES (2)
MICROHARDNESS (2)
TITANIUM ALLOYS (2)
WELD INTEGRITY (2)
(A) STAINLESS STEEL (1)
(C) ELECTRON BEAM FREEFORMING (1)
(D) WIRE FEED WELDING (1)
7075 ALUMINIUM ALLOY (1)
A. FERROUS METALS AND ALLOYS (1)
A. NON-FERROUS METALS AND ALLOYS (1)
AA6061-T6 (1)
ACTIVATION ENERGY (1)
ADDITIVE MANUFACTURING (1)
ADHESIVE (1)
ADIABATIC HEATING (1)
AEROSPACE ALLOYS (1)
ALUMINUM ALLOY 2024 (1)
AS-WELDED JOINTS (1)
BEND TESTING (1)
BULGE TESTING (1)
C. LASERS (1)
CARBIDES (1)
CAST CA6NM MARTENSITIC STAINLESS STEEL (1)
CHARACTERIZATION (1)
CHARPY V-NOTCH TESTING (1)
COMPOSITE (1)
COMPRESSION TEST (1)
CONSTITUTIVE MODELING (1)
CONTOUR METHOD (1)
COPPER (1)
CRYSTALLOGRAPHIC TEXTURE (1)
DIFFRACTION (1)
DIRECT LASER DEPOSITION (1)
DUCTILITY (1)
EBSD (1)
ELECTRON BACKSCATTER DIFFRACTION (1)
ENGINEERING (1)
F. MICROSTRUCTURE (1)
FATIGUE (1)
FE-SEM (1)
FIBER LASER (1)
FILLER WIRE (1)
FINITE ELEMENT SIMULATION (1)
FLOW SOFTENING (1)
FLOW STRESS (1)
FRICTION (1)
FRICTION WELDING (1)
GAP TOLERANCE (1)
GRAIN SIZE (1)
HEAT INPUT (1)
HOT WORKING (1)
HYDRIDES (1)
HYDROFORMING (1)
HYPEREUTECTOID STEELS (1)
IN-SERVICE (1)
IN-SERVICE REPAIR (1)
IN718 (1)
INCONEL 718 (1)
INCONEL 718 SUPERALLOY (1)
INDUSTRIAL ROBOT (1)
INDUSTRY (1)
INTERFACIAL STABILITY (1)
INTERLAMELLAR SPACING (1)
INTERMEDIATE HEAT TREATMENTS (1)
INTERMETALLIC COMPOUND (1)
ISOTHERMAL DEFORMATION (1)
ISOTHERMAL HOT COMPRESSION (1)
KINETOSTATIC ANALYSIS (1)
LASER DEPOSITION (1)
LOW ENERGY ELECTRON MICROSCOPY (1)
MARTENSITIC STAINLESS STEEL (1)
MATERIAL BEHAVIOR (1)
MATERIAL CHARACTERIZATION (1)
MISORIENTATION (1)
MULTI-STAGE FORMING (1)
MULTI-STEP FORMING (1)
NEUTRON DIFFRACTION (1)
NEUTRON SCATTERING (1)
ONSET OF NECKING (1)
OPERATIONAL WINDOW (1)
OXIDE (1)
PEARLITE INTERLAMELLAR SPACING (1)
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Elsevier (25)
Springer (19)
Wiley (1)

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Search results for: P. Wanjara

Linear Friction Welding of Dissimilar Materials 316L Stainless Steel to Zircaloy-4

Residual stress analysis in linear friction welded in-service Inconel 718 superalloy via neutron diffraction and contour method approaches

Mechanical properties of electron beam welds in heavy-section UNS S41500 martensitic stainless steel

Phase structures and morphologies of tempered CA6NM stainless steel welded by hybrid laser-arc process

Mechanical properties and microstructural evolution of in-service Inconel 718 superalloy repaired by linear friction welding

Global and local characteristics of an autogenous single pass electron beam weld in thick gage UNS S41500 steel

Mechanical and Metallurgical Evolution of Stainless Steel 321 in a Multi-step Forming Process

Extension of flow stress–strain curves of aerospace alloys after necking

Analysis of integrity and microstructure of linear friction welded Waspaloy

Characteristics of an autogenous single pass electron beam weld in thick gage CA6NM steel

High and low cycle fatigue behavior of linear friction welded Ti–6Al–4V

Evolution of flow stress and microstructure during isothermal compression of Waspaloy

Evaluating the flow stress of aerospace alloys for tube hydroforming process by free expansion testing

Texture Development in a Friction Stir Lap-Welded AZ31B Magnesium Alloy

Microstructural Analysis of Linear Friction-Welded 718 Plus Superalloy

Oxide films in laser additive manufactured Inconel 718

Gap tolerance allowance and robotic operational window for friction stir butt welding of AA6061

Lap shear strength and fatigue behavior of friction stir spot welded dissimilar magnesium-to-aluminum joints with adhesive

Friction Stir Welded AZ31 Magnesium Alloy: Microstructure, Texture, and Tensile Properties

Microstructure and Fatigue Properties of a Friction Stir Lap Welded Magnesium Alloy

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