The demand for components made from high performance materials like titanium or nickel-based alloys as well as strain-hardening stainless steel is steadily increasing. However, conventional forming operations conducted on these materials are generally very laborious and time-consuming. This is where the limitations of metal spinning also become apparent. Using a laser to apply heat localized to...

conclusions caffeic acid treatment reduced bacterial growth and resulted in a decreased number of colony formation. the simultaneous effect of caffeic acid and laser at three time courses showed a synergic effect in reducing colony formation compared to the control and caffeic acid, and laser alone. objectives the aim of this study was to investigate the effect of caffeic acid and low-power las...

the forming limit diagram (fld) is a useful method for characterizing the formability of sheet metals. in this paper, different numerical models were used to investigate the fld of tailor welded blank (twb). twbs were co2 laser-welded samples of interstitial-free (if) steel sheets with different thicknesses. the results of the numerical models were compared with the experimental fld as well as ...

one of the great challenges in the processing of materials using equal channel angular pressing (ecap) is the high forming forces required to produce large shear deformation in the material. researchers show that the friction forces between the die and the sample constitute a great part of the total forming forces. recently, ultrasonic vibrations are successfully implemented into the ecap proce...

For laser forming of sheet metal to become a practical production or rapid prototyping tool, multiscan, that is, to use a laser to scan the workpiece repeatedly is necessary in order to achieve the required magnitude of deformation. Between consecutive scans, substantial waiting time is normally necessary for the workpiece to cool down in order for a steep temperature gradient to be reestablish...

Laser forming of steel is a hot forming process with high heating and cooling rate, during which strain hardening, dynamic recrystallization, and phase transformation take place. Numerical models considering strain rate and temperature effects only usually give unsatisfactory results when applied to multiscan laser forming operations. This is mainly due to the inadequate constitutive models emp...

Abstract With the continuous development of ship technology, usage environment some parts has changed, with higher requirements for materials and preparation technology being put forward. Some traditional structural have do not meet actual working conditions ships, which necessitates new research on their technology. Owing to its high strength stable mechanical properties at temperature, molybd...

Bending angle obtained in laser forming process is much smaller than that conventional die pressing or roller bending processes. Therefore, multi-stage necessary to form deep drawn shapes and/or complex by forming. However, irradiation varies material properties, posture, and stiffness of metal plates, those influences are accumulated during the consecutive stages process. Thus, thermo-elasto-p...