Friction stir welding of advanced high strength (bainitic) steels for automotive applications

Ramakrishna, R.V.S.M.; Rao, K. Bhanu Sankara; Reddy, G. Madhusudan; Gautam, Jai Prakash

doi:10.1016/j.matpr.2018.04.122

Cited by 13 publications

(19 citation statements)

References 9 publications

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“…The contributory factors that influence the weldability aspects of Fiber Laser Welding are heat input during welding, power and of speed of laser beam. Among the aforementioned parameters, the change in speed is the important contributing parameter that dictates the phase transformations there by feasibility of welding [6]. The wide adoption of Fiber Laser Welding as the method of fabrication of steels was held up due to nonavailability of an appropriate fiber material.…”

Section: Fig 1 Rolling Methods To Produce Bainitic Steels For Currenmentioning

confidence: 99%

Optimization of post weld heat treatment cycle of fiber laser welded bainitic steel

R¹,

Gautam

2020

E3S Web Conf.

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Automobile industry has always been in look out for advanced materials that would account for greater crash resistance, high fatigue strength, optimum ductility and longer service life despite heavy mechanical loads applied on these engine components. These critical requirements are met through maintaining the complex microstructures and optimum phase constituents. The retention of microstructural constituents has always been a key parameter while fabricating these advanced automobile materials by fusion welding process. Carbide free bainitic steels are emerging out to be the candidate materials for automobile applications. Owing to their microstructure consisting fine bainitic ferrite laths that are interwoven with retained austenite in their lath boundaries. The fine Bainitic laths provide enough strength and the retained austenite phase facilitates the desired ductility. The current paper critically discusses the microstructural and microhardness variation across the zones during Fiber Laser welding of bainitic steel sheets. Keeping the phase transformations during welding in view, post weld heat treatments were undertaken. The welded steel was austenitized at 820 OC, rapidly cooled to 390 OC, and soaked at different durations before furnace cooing. The microstructure variation and microhardness profiling were done at all these heat treatment conditions. Basing on the analyses, the heat treatment cycle has been optimized.

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Section: Fig 1 Rolling Methods To Produce Bainitic Steels For Currenmentioning

confidence: 99%

Optimization of post weld heat treatment cycle of fiber laser welded bainitic steel

R¹,

Gautam

2020

E3S Web Conf.

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“…Another welding method used for nanostructured CFB steels is friction stir welding (FSW) [27,28]. The joining process takes place in a solid state, which reduces the formation of distortions and defects associated with thermal contraction.…”

Section: Review Of Welding Methodsmentioning

confidence: 99%

“…The material after cooling forms a joint between the plates [29]. In References [27,28], it was found that the parameters of the FSW process affect the mechanical properties and microstructure of the obtained joints. The research concerned silicon-rich steels with a relatively low carbon content (0.34 wt.%).…”

Section: Review Of Welding Methodsmentioning

confidence: 99%

Welding Capabilities of Nanostructured Carbide-Free Bainite: Review of Welding Methods, Materials, Problems, and Perspectives

2019

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This article presents state-of-the-art welding methods and the weldability aspect of steels, particularly high-carbon nanobainitic (NB) steels, without carbide precipitates (CFB—carbide-free bainite). On the basis of research conducted to date, all welding methods with parameters and weld metals for NB CFB are presented. It was found that the process parameters significantly affected the mechanical properties of the welds, which were determined primarily by the properties of the low-temperature heat-affected zone. The microstructures of welded joints in the heat-affected and fusion zones are also described. The general requirements for welding processes, as well as problems and perspectives for further research, are presented.

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“…The feasibility of joining copper and dissimilar materials such as aluminium and copper has also been studied to investigate the optimum machining parameters on the mechanical properties of the materials [8,9]. Recently, several research and development studies have been conducting to explore the potential applications of FSW for harder materials such as steel and titanium alloys [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

An advanced modelling to improve the prediction of thermal distribution in friction stir welding (FSW) for difficult to weld materials

Sarikavak

2020

J Braz. Soc. Mech. Sci. Eng.

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This study explores the thermal distribution of high-strength engineering alloys during the friction stir welding process (FSW). Materials which are difficult to weld or are unweldable by conventional welding processes can be successfully welded by FSW. The specific analysis and modification of the process require an understanding of the actual mechanism of the process. Therefore, a transient, three-dimensional, thermo-mechanical finite element model (FEM) for FSW was developed. The model calculates the temperature distribution during the welding process considering various boundary conditions such as rotational speed, linear speed, normal pressure, tool diameter and material properties. The thermo-mechanical FEM calculations consider the effects of conduction and convection heat transfer. The numerical results are successfully compared and validated by experimental results published in the literature for aluminium alloy, titanium alloy and steel (mild and bainitic) as workpiece materials. The model was found to be useful for understanding the effects of changes in different system parameters, and for selecting the optimum welding conditions before undertaking high-cost physical testing.

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Friction stir welding of advanced high strength (bainitic) steels for automotive applications

Cited by 13 publications

References 9 publications

Optimization of post weld heat treatment cycle of fiber laser welded bainitic steel

Optimization of post weld heat treatment cycle of fiber laser welded bainitic steel

Welding Capabilities of Nanostructured Carbide-Free Bainite: Review of Welding Methods, Materials, Problems, and Perspectives

An advanced modelling to improve the prediction of thermal distribution in friction stir welding (FSW) for difficult to weld materials

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