Abstract:The article describes basic principles of induction bending and the change of mechanical properties from as received (straight) pipe made from HSLA steel to induction bend. The main purpose of this article is to experiment with tempering temperatures below 540°C. After tempering at 540°C which is the lowest recommended temperature for post bend heat treatment (PBHT) according to CSA specifications (Canadian Standards Association) the induction bend area in many cases does not achieve the minimum required mechanical properties and therefore it is not accepted for usage. In this article mechanical properties such as tensile, toughness, hardness are evaluated. Also the article contains microstructural analyses and comparison of bended and heat treated samples.

Abstract-This paper reports the results of comparative studies of the abrasive and fretting wear resistance of specimens manufactured by the method of selective laser melting and casting. The materials of specimens are powdered CoCrMo cobalt refractory alloy and the cast KKhS D cobalt based alloy.

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Abstract-A model of dynamic effect during low amplitude oscillations of surfaces comparable with the pre liminary displacement and the first acts of sleep under the oscillating tangential loading of the contact is developed. Solving a system of differential force balance equations has yielded the main characteristics of the process of the dynamics of a nominally stationary contact depending on the governing parameters of the sys tem. Regularities of the friction characteristic at low sliding velocity are determined with allowance for the preliminary displacement phenomenon, the Stribeck effect, as well as the parameter of the plasticity and vis cosity of friction. The model allows one tracing the evolution of relative displacements and slip velocities, cal culating phase diagrams, as well as deriving the friction characteristic and real slip amplitudes typical of the mixed friction mode and low amplitude fretting.