Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/123669
Title: Formability Studies of Austenitic Stainless Steel 316 at Elevated Temperatures
Researcher: SYED MUJAHED HUSSAINI
Guide(s): Amit Kumar Gupta
Keywords: lAustenitic Stainless Steel 316,Elevated Temperatures
University: Birla Institute of Technology and Science
Completed Date: 
Abstract: Sheet metal forming involves forming of flat thin sheet metal blanks into desired shape and size, under the applied forces by punch and die assembly. Sheet metal forming processes are widely used for producing a large number of simple to complex shape components in automotive, aerospace, nuclear, and defense applications. In recent times, there has been a growing demand for sheet metal forming of high strength materials like stainless steels, titanium alloys, etc., which have a poor drawability at room temperature due to having high mean flow stress values. One of the ways to overcome this limitation is warm forming, in which the material is usually formed at an elevated temperature, (0.3 0.5) times of melting temperature. Warm forming helps in decreasing the load requirement for plastic deformation, in attaining uniform thickness distribution in the drawn component and in increasing the material formability significantly. newlineThe focus of this research work is to study the forming behavior of Austenitic Stainless Steel (ASS) 316 at elevated temperatures through deep drawing experimentation. First, the material has been characterized using tensile tests at elevated temperatures and different mechanical properties such as Young s modulus, yield stress, strain hardening exponent, etc. have been evaluated. In addition, with the help of observations about serrations in true stress vs. true strain curves and the presence of negative strain rate sensitivity, the presence of Dynamic Strain Aging (DSA) phenomenon has been identified. In ASS 316, the DSA phenomenon occurred in a temperature range of 400°C 600°C and at a strain rate of less than 10-2 s-1. newlinevi newlineIn order to understand the formability behavior of ASS 316 at elevated temperatures, deep drawing experiments have been conducted on a hydraulic press test setup from room temperature to 400°C. The drawability has been measured in terms of the Limiting Draw Ratio (LDR) and the thickness distribution of the drawn cups. It has been found that the LDR increases.
Pagination: 5.18 MB
URI: http://hdl.handle.net/10603/123669
Appears in Departments:Mechanical Engineering

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