Grain Size Effect on the Hot Deformation Processing Map of AISI 304 Austenitic Stainless Steel

author

  • J. Rasti Department of Mechanical Engineering, Qom University of Technology (QUT)
Abstract:

In this study, the hot deformation processing map of AISI 304 austenitic stainless steel in two initial grain sizes of 15 and 40 μm was investigated. For this purpose, cylindrical samples were used in the hot compression test at the temperature range of 950-1100 °C and the strain rate of 0.005-0.5% s-1. At first, the relationship between the peak stress and Zener-Hollomon parameter was obtained and their microstructures were studied, then the strain rate sensitivity and the processing map were determined at the strains of 0.5 and 0.7. It was found that in the aforementioned temperature range and strain rate ,the prevailing softening mechanism was the dynamic recrystallization process. Instability regions were observed at lower temperatures and higher strain rates, associated with the occurrence of necklace phenomenon in both grain sizes, as well as the semi-necklace structure in coarse-grained steel and in fine grain steel to the formation of geometrically necessary dislocation along the grain boundaries. Moreover, it was associated with the development of cell structure interior the grains. In addition, with an increase in temperature and a decrease in strain rate, both the power dissipation efficiency and the strain rate sensitivity increased, indicating an increase in the volume of the recrystallized materials in a constant strain and a decrease in the localization of the plastic flow.

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

The Effect of Hot Deformation Parameters on Grain Size Refinement in a Martensitic Stainless Steel

The grain size refinement of AISI 422 martensitic stainless steel in the temperature range of 950-1150 ºC was investigated by hot deformation tests. The deformed specimens were held at deformation temperature with delay times of 5 to 300s after achieving a strain of 0.3. The austenite grains exhibit a considerable growth at temperature higher than 1050˚C, while the grain coarsening is negligibl...

full text

Effect of Thickness to Grain Size Ratio on Drawability for Micro Deep Drawing of AISI 304 Stainless Steel

Although deep drawing process in the macro scale are well developed, the known concepts cannot be applied to micro deep drawing through directly scale down the specimen and tooling size due to the so-called size effects. Therefore, tensile test and micro deep drawing experiments were conducted to generate the knowledge for the micro deep drawing process. Stainless steel 304 foils with 4 differe...

full text

Design optimization of cutting parameters for turning of AISI 304 austenitic stainless steel using Taguchi method

In the present work Taguchi method is used to optimize cutting parameters during dry turning of AISI 304 austenitic stainless steel with AlTiCrN coated tool. The coating was deposited on fine-grained K-grade (ISO K-20) cemented carbide cutting insert using physical vapor deposition (PVD) technique. The turning parameters evaluated are cutting speed of 200 and 260 m/min, feed rate of 0.20 and 0....

full text

The adhesion of hot-filament CVD diamond films on AISI type 316 austenitic stainless steel

Steel ball indentation and scratch adhesion testing of hot filament chemical vapour deposited diamond films onto AISI type 316 austenitic stainless steel substrates using two different interlayer systems, namely chromium nitride and borided steel, have been investigated. In order to compare the adhesion of these films with that of a well-known and strongly adherent system, detailed adhesion tes...

full text

Regression analysis of shot peening process for performance characteristics of AISI 304 austenitic stainless steel

The surface fibers of the material are yielded in tension by the impact of shots in shot peening process. Below the surface fiber an even thin skin surface layer of material is deformed and this layer is highly stressed in compression. It results in the improvement of surface and mechanical properties of the material. Regression analysis is the statistical modeling technique, and it is suitable...

full text

Optimization of Surface Roughness of Aisi 304 Austenitic Stainless Steel in Dry Turning Operation Using Taguchi Design Method

The present work is concentrated with the dry turning of AISI 304 Austenitic Stainless Steel (ASS). This paper presents the influence of cutting parameters like cutting speed, feed rate and depth of cut on the surface roughness of austenitic stainless steel during dry turning. A plan of experiments based on Taguchi’s technique has been used to acquire the data. An orthogonal array, the signal t...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 15  issue 2

pages  54- 61

publication date 2018-12-01

By following a journal you will be notified via email when a new issue of this journal is published.

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023