A preliminary study on machinability of super austenitic stainless steel

Polishetty, Ashwin, Alabdullah, Mohanad Fakhri Abdulqader, Pillay, Nihal and Littlefair, Guy 2015, A preliminary study on machinability of super austenitic stainless steel, in IMECE 2015 : Advanced Manufacturing : Proceedings of the ASME International Mechanical Engineering Congress & Exposition, ASME, New York, N.Y., pp. 1-8, doi: 10.1115/IMECE2015-50224.

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Title A preliminary study on machinability of super austenitic stainless steel
Author(s) Polishetty, AshwinORCID iD for Polishetty, Ashwin orcid.org/0000-0002-8572-6024
Alabdullah, Mohanad Fakhri AbdulqaderORCID iD for Alabdullah, Mohanad Fakhri Abdulqader orcid.org/0000-0003-3214-8926
Pillay, Nihal
Littlefair, Guy
Conference name ASME International Mechanical Engineering. Congress & Exposition (2015 : Houston, Texas)
Conference location Houston, Texas
Conference dates 13-19 Nov. 2015
Title of proceedings IMECE 2015 : Advanced Manufacturing : Proceedings of the ASME International Mechanical Engineering Congress & Exposition
Publication date 2015
Start page 1
End page 8
Total pages 8
Publisher ASME
Place of publication New York, N.Y.
Keyword(s) super austenite stainless steel
cutting forces
surface roughness
Summary Stainless steel is the most widely used alloys of steel. The reputed variety of stainless steel having customised material properties as per the design requirements is Duplex Stainless Steel and Austenitic Stainless Steel. The Austenite Stainless Steel alloy has been developed further to be Super Austenitic Stainless Steel (SASS) by increasing the percentage of the alloying elements to form the half or more than the half of the material composition. SASS (Grade-AL-6XN) is an alloy steel containing high percentages of nickel (24%), molybdenum (6%) and chromium (21%). The chemical elements offer high degrees of corrosion resistance, toughness and stability in a large range of hostile environments like petroleum, marine and food processing industries. SASS is often used as a commercially viable substitute to high cost non-ferrous or non-metallic metals. The ability to machine steel effectively and efficiently is of utmost importance in the current competitive market. This paper is an attempt to evaluate the machinability of SASS which has been a classified material so far with very limited research conducted on it. Understanding the machinability of this alloy would assist in the effective forming of this material by metal cutting. The novelty of research associated with this is paper is reasonable taking into consideration the unknowns involved in machining SASS. The experimental design consists of conducting eight milling trials at combination of two different feed rates, 0.1 and 0.15 mm/tooth; cutting speeds, 100 and 150 m/min; Depth of Cut (DoC), 2 and 3 mm and coolant on for all the trials. The cutting tool has two inserts and therefore has two cutting edges. The trial sample is mounted on a dynamometer (type 9257B) to measure the cutting forces during the trials. The cutting force data obtained is later analyzed using DynaWare supplied by Kistler. The machined sample is subjected to surface roughness (Ra) measurement using a 3D optical surface profilometer (Alicona Infinite Focus). A comprehensive metallography process consisting of mounting, polishing and etching was conducted on a before and after machined sample in order to make a comparative analysis of the microstructural changes due to machining. The microstructural images were capture using a digital microscope. The microhardness test were conducted on a Vickers scale (Hv) using a Vickers microhardness tester. Initial bulk hardness testing conducted on the material show that the alloy is having a hardness of 83.4 HRb. This study expects an increase in hardness mostly due to work hardening may be due to phase transformation. The results obtained from the cutting trials are analyzed in order to judge the machinability of the material. Some of the criteria used for machinability evaluation are cutting force analysis, surface texture analysis, metallographic analysis and microhardness analysis. The methodology followed in each aspect of the investigation is similar to and inspired by similar research conducted on other materials. However, the novelty of this research is the investigation of various aspects of machinability and drawing comparisons between each other while attempting to justify each result obtained to the microstructural changes observed which influence the behaviour of the alloy. Due to the limited scope of the paper, machinability criteria such as chip morphology, Metal Removal Rate (MRR) and tool wear are not included in this paper. All aspects are then compared and the optimum machining parameters are justified with a scope for future investigations
ISBN 9780791857359
Language eng
DOI 10.1115/IMECE2015-50224
Field of Research 091399 Mechanical Engineering not elsewhere classified
Socio Economic Objective 869999 Manufacturing not elsewhere classified
HERDC Research category E1 Full written paper - refereed
ERA Research output type E Conference publication
Copyright notice ©2015, ASME
Persistent URL http://hdl.handle.net/10536/DRO/DU:30082615

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