Formability studies on Ni-Ti shape memory alloy using laser forming technology

3rd International Conference on Materials and Manufacturing Engineering 2018

Sharma, Abhinav^1 ; Mani Prabu, S.S.^1 ; Palani, I.A.^1 ; Hosmani, S.S.^1 ; Patil, Rohit^2

Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Indore

453552, India^1

Control and Automation Department, VIT University, Vellore

632014, India^2

关键词: Advanced manufacturing;    Continuous fibers;    Differential scanning calorimeters;    External force;    Manufacturing industries;    Maximum power;    NiTi shape memory alloys;    Process parameters;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/390/1/012053/pdf
DOI  :  10.1088/1757-899X/390/1/012053

来源: IOP

【 摘 要 】

Laser forming is an advanced manufacturing process which is extensively used in automotive and manufacturing industry by deforming metallic and non-metallic sheets. In this process, a continuous fiber laser is irradiated over Ni-Ti sheet. As the laser beam imbibed over the sheet, a step temperature thermal gradient got induced across the thickness of the sheet. The bending moment arises due to uneven thermal stresses leads to the deformation of the sheet without using any external forces. This paper shows the experiments performed on Ni-Ti sheets of dimension 60mm×50mm with a maximum power of 50W. The process parameters which were varied are number of passes (10 to 20), power (30W to 50W) to get the maximum bending angle with a uniform spot diameter of 2mm. The study between variations of the bending angle with process parameters is done. After this, the characterization of samples was done using differential scanning calorimeter (DSC) and the changes in phase transformation of Ni-Ti SMA with respect to change in different powers and number of passes is studied.