Residual Stress in Steels caused by Various Heat-Treatments

Effects of Heat Treatments on Steels for Bearing Applications

Heat Transfer in Semitransparent Medium Caused by Laser Pulse

In this paper, the combination of conduction with radiation into a semitransparent medium which includes absorption, emission and scattering has been investigated. In order to Study the conduction in medium, the Non-Fourier heat conduction has been applied. In this model there is a time delay between heat flux and temperature gradient. Also, in contrast with Fourier heat conduction, the speed o...

Effect of Residual Stress on Failure of Tube-to-tubesheet Weld in Heat Exchangers

In a shell and tube heat exchanger, the failure of tube-to-tubesheet welds results in high-pressure water jet which erodes the refractory in front of the tubesheet. Finite element method was employed to simulate the welding process and post weld heat treatment (PWHT) to find the factors affecting the failure in tube-to-tubesheet weldments. Residual stresses in two different geometries of tube-t...

Effect of a Coating Induced Residual Stress on Magnetic Domain Structure in Non-Oriented Electrical Steels

To produce the magnetic core of the electric motors, non-oriented electrical steels (NOES) are used. Recently much attention has been focused on optimizing the efficiency of electric motors and, as such, various materials aspects of NOES are being re-examined. Typically, NOES are used in the form of laminations (~200-1000 μm thick) with an electrically insulating coating applied to the surface....

Effects of Various Ageing Heat Treatments on Microstructural Features and Hardness of Piston Aluminum Alloy

Piston aluminum alloys have different intermetallic phases, such as Cu3Al, Mg2Si ,and AlNi phases. The morphology and the distribution of such phases have important roles on mechanical properties of the piston material. Therefore, in this research, various ageing heat treatments on the mentioned material were done and the microstructural feature and the hardness were studi...