Open AccessEstimation of residual stress and deformation of laser deposited tracks of Ni-5Mo-5Al powder using thermo-mechanical finite element simulation
Author(s) -
Ankit Shrivastava,
Vikash Kumar,
Vivek Singh,
Sumanta Mukherjee,
Prakash Kumar,
Sitanshu Shekhar Chakraborty
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/561/1/012059
Subject(s) - materials science , residual stress , composite material , cladding (metalworking) , laser , thermal spraying , deformation (meteorology) , metallurgy , rod , stress (linguistics) , ultimate tensile strength , finite element method , coating , optics , structural engineering , medicine , alternative medicine , pathology , linguistics , philosophy , physics , engineering
Exhaust fans and manifolds, valve and pump seats, connecting rods etc. are coated with Ni-5Mo-5Al powder for service temperature up to 650 °C. Till date, it has been coated on structural steels etc. substrate mostly using plasma spray and High-Velocity Oxy-Fuel (HVOF) spraying. However, a few pioneering works, reported cladding by melt and deposition of the same powder using laser. Laser being much more precise heat source has the potential to achieve cladding without causing much thermally induced damage. In this work, laser cladding of Ni-5Mo-5Al powder was simulated probably for the first time. Layer thickness and width were input from the experiments. A significant amount of tensile residual stress (up to 500 MPa normal stress component along the scan track) and deformation (up to 32 μm) of the deposited layer was found in the simulation results. These were more at higher laser power. Experiments consisted of depositing overlapping tracks, on AISI 1020 steel cylindrical substrates having 39 mm diameter and 22.4 mm thickness, by blown powder method, with the help of a 2 KW Yb fibre laser having 1.07 μmwavelength.