Effect of Quenching Media on Laser butt Welded Joint on Transformed -Induced Plasticity (TRIP) Steel

The characteristics of laser welding joint were investigated by bearing in mind the effect of normal materials, Post-heated materials and cooled with different media i.e. water and air on microstructure, microhardness distribution and tensile strength on Transformation-Induced Plasticity (TRIP) Steel. In our, experiments The Normal -Air (N-A) specimen gives ultimate tensile strength is very improved as 575.05 MPa with the elongation as 14.8% as compare to 524.37 MPa ultimate tensile strength and 22.8% elongation in case of N-N specimen which gives 9.66% change in ultimate tensile strength. As its ultimate tensile strength and percentage elongations decrease, the outcome of N-W Prepared samples also follows the inverse pattern. The tensile strength affects reversal with respect to lower cooling rate of the welded specimen during air quenching and the faster cooling rate leads to more distortion in water quenching. Finally, microstructure, microhardness behavior of Base Metal (BM), Heat Affected Zone (HAZ) and Fusion Zone (FZ) was investigated and discussed.