Search

Austenitic Stainless-Steel grade 316 L is one of the huge ASS grades used in different industry sectors, nuclear power plants and pharmaceutical applications. Because of these various applications at high temperature, it is a must to know its properties at different conditions. The present work focued on to improve the mechanical properties, like ultimate tensile strength (UTS), yield strength (YS), strain hardening exponent (n) and % elongation. These are assessed depending on the test information obtained from the uniaxial isothermal tensile tests. A total of 27 tests based on fullfactorial designed to performe temperature at 750°C, 825°C and 900°C, three orientations (0, 45, 90) degrees to the rolling direction and strain rates (0.1, 0.01 and 0.001 s−1) were chosen. From the experimental results, it is clear that temperature and strainrate has a significant effect on material properties. With the rise in temperature, % elongation increases and a considerable decline in strength was observed. The scanning electron microscope and microstructural analysis was carried out at elevated temperatures to type of fracture. From ANOVA analysis, it was observed that temperature for UTS, combine temperature * strain rate for YS and strain rate*strain rate for % elongation with 85.889%, 38.93 and 65.73% contribution respectively. [ABSTRACT FROM AUTHOR]

Austenitic Stainless Steel 316 L grade has wide applications in industries like pharmaceutical, chemical, petrochemical, medical equipment, and many specific subzero temperature products. These subzero applications are increasing in modern-day products to solve many issues like Natural gas storage and transport and many more. It is an ideal material for these applications due to its superior properties at these operating temperatures. In the present investigation tensile tests for ASS316 L material is conducted by considering the various parameters like different temperatures (room temperature(RT), 0°C, −25°C, −50°C) along with different orientation (0°,45°,90°), and crosshead speeds (3, 5 and 7 mm/min). The temperature variation was achieved by regulating the liquid CO2 cylinder connected using a pipe system to the closed furnace of the Universal Testing Machine setup is electronic controlled system. The output data were used to analyse the Mechanical Characteristics of the material. Then the fractured specimens at the room temperature and sub-zero temperatures were studied and analysed the failure modes in the material for the above changing variables. It was observed that the failure mode is changing from a ductile fracture to brittle when decreasing the temperature below zero degrees centigrade as predicted. [ABSTRACT FROM AUTHOR]