Abstract
The correct choice of a material in the process of structural design is the most important task. This study deals with determining and analyzing the mechanical properties of the material, and the material resistance to short-time creep and fatigue. The material under consideration in this investigation is austenitic stainless steel X6CrNiTi18-10. The results presenting ultimate tensile strength and 0.2 offset yield strength at room and elevated temperatures are displayed in the form of engineering stress-strain diagrams. Besides, the creep behavior of the steel is presented in the form of creep curves. The material is consequently considered to be creep resistant at temperatures of 400 °C and 500 °C when subjected to a stress which is less than 0.9 of the yield strength at the mentioned temperatures. Even when the applied stress at a temperature of 600 °C is less than 0.5 of the yield strength, the steel may be considered as resistant to creep. Cyclic tensile fatigue tests were carried out at stress ratio R = 0.25 using a servo-pulser machine and the results were recorded. The analysis shows that the stress level of 434.33 MPa can be adopted as a fatigue limit. The impact energy was also determined and the fracture toughness assessed.
Highlights
The structure is usually designed both in accordance with the purpose for the use intended and with favorable material selection
Specimens used in uniaxial tests to determine engineering stress-strain diagrams and in creep testing were machined from 18 mm steel rod
The structure operating under certain environmental conditions is to be subjected to certain operating under certain environmental conditions be structure subjected to certain structure operating under acertain environmental conditions is meet toisbetothe subjected to certain loads.The
Summary
The structure is usually designed both in accordance with the purpose for the use intended and with favorable material selection. The basic properties of steel depend on the chemical composition, resulting microstructure, the state, form, and dimensions of the finished product This means that processing as a means to development and control of the microstructure as well as heat treatment are of significance for achieving the required material properties. Its optimal fabrication and mechanical properties are achieved after solution annealing (temperature range: from 1075 ̋ C to 1125 ̋ C) followed by rapid cooling (air or water) Equipment used in these investigations can be divided into equipment used to perform uniaxial tests at room and high temperatures and equipment used to determine impact energy. Specimens used in uniaxial tests to determine engineering stress-strain diagrams and in creep testing were machined from 18 mm steel rod. All of the mentioned standards can be found in the Annual Book, Ref. [35]
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