Title: Surface integrity analysis in the super duplex stainless steel ASTM-A890 after machining

Authors: Ed Claudio Bordinassi, Marco Filho Stipkovic, Gilmar Ferreira Batalha, Sergio Delijaicov, Nelson Batista de Lima

Addresses: Escola de Engenharia Maua, Instituto Maua de Tecnologia, Sao Caetano do Sul, SP 09580-900, Brasil. ' Escola de Engenharia Maua, Instituto Maua de Tecnologia, Sao Caetano do Sul, SP 09580-900, Brasil; Departamento de Engenharia Mecatronica e Sistemas Mecanicos, Escola Politecnica da Universidade de Sao Paulo, Sao Paulo, SP 05508-900, Brasil; Departamento de Engenharia Mecanica, Escola de Engenharia da Universidade Presbiteriana Mackenzie, Sao Paulo, SP 01302-907, Brasil. ' Departamento de Engenharia Mecatronica e Sistemas Mecanicos, Escola Politecnica da Universidade de Sao Paulo, Sao Paulo, SP 05508-900, Brasil. ' Escola de Engenharia Maua, Instituto Maua de Tecnologia, Sao Caetano do Sul, SP 09580-900, Brasil; Faculdade de Engenharia Industrial, Centro Universitario da FEI, Sao Bernardo do Campo, SP 09850-901, Brasil. ' Laboratorio de difracao de raios-x – CCTM, Instituto de Pesquisas Energeticas e Nucleares IPEN-CNEN, Sao Paulo, SP 05508-900, Brasil

Abstract: The purpose of this paper was to study the main effects of the turning in the superficial integrity of the duplex stainless steel ASTM A890-6A. The tests were conducted on a turning centre with carbide tools and the main entrances variables were: tool material class, feed rate, cutting depth, cutting speed and cutting fluid utilisation. The answers were analysed: microstructural analysis by optical microscopy and x-ray diffraction, cutting forces measurements by a piezoelectric dynamometer, surface roughness, residual stress by x-ray diffraction technique and the microhardness measurements. The results do not show any changes in the microstructural of the material, even when the greater cutting parameters were used. The smaller feed rate (0.1 mm/v), smaller cutting speed (110 m/min) and the greater cutting depth (0.5 mm) provided the smaller values for the tensile residual stress, the smaller surface roughness and the greater microhardness. [Received on 3 April 2006; Accepted on 21 February 2007]

Keywords: machining; turning; surface integrity analysis; ASTM-A890; super duplex stainless steel; residual stress; carbide tools; tool materials; feed rate; cutting depth; cutting speed; cutting fluids; microstructure; cutting force; surface roughness; microhardness.

DOI: 10.1504/IJMPT.2008.020582

International Journal of Materials and Product Technology, 2008 Vol.33 No.3, pp.198 - 212

Available online: 01 Oct 2008 *

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