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

Bordinassi, Ed Claudio; Stipkovic, Marco Filho; Batalha, Gilmar Ferreira; Delijaicov, Sérgio; Lima, Nelson Batista de

doi:10.1504/ijmpt.2008.020582

Cited by 14 publications

(21 citation statements)

References 17 publications

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“…They are alloys of Fe-Cr-Ni-Mo and also contain up to 0.30 % by weight nitrogen [10]. Due to their microstructure, duplex stainless steels present a good combination of ferritic and austenitic steel properties: increased toughness, high mechanical strength, and high corrosion resistance in several environments [11].…”

Section: Super Duplex Stainless Steelmentioning

confidence: 99%

Tool wear mechanisms in the machining of steels and stainless steels

Diniz

Machado

Corrêa

2016

Int J Adv Manuf Technol

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In machining processes, tool performance is measured by the tool life, which is determined by the tool wear rate. This rate is strongly dependent on the tool wear mechanisms that occur in a specific process. Moreover, determining the wear mechanism is a fundamental task for the development of cutting tools. However, the tool wear mechanism depends on factors such as the workpiece material, the cutting operation, the properties of the tool material, the cutting conditions, and the cooling/lubrication system. This study aims to contribute to the understanding of the mechanisms that cause wear in tools. First, it presents a review of the literature describing the wear mechanisms that are present in metal cutting. Then, an analysis of the tool wear mechanisms during the machining of steels and stainless steels using different cutting tools is presented based on a review of studies performed mostly by research groups at the University of Campinas and Federal University of Uberlandia, Brazil. This analysis was performed using pictures of the worn regions taken in a scanning electronic microscope (SEM) with energydispersive spectroscopy (EDS) device which are fundamental to better understand the causes of tool wear. The major findings of this work were as follows: (i) Attrition is a very important wear mechanism in the machining of ductile materials such as steels and stainless steels; (ii) when a steel alloy with high ductility and work hardening rate is machined, a hard burr occurs in the end of the depth of cut and the burrfurrowing effect on the tool coating stimulates the attrition mechanism; and (iii) other wear mechanisms like abrasion and diffusion also appear in the machining of steels and stainless steels.

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Section: Super Duplex Stainless Steelmentioning

confidence: 99%

Tool wear mechanisms in the machining of steels and stainless steels

Diniz

Machado

Corrêa

2016

Int J Adv Manuf Technol

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“…The level of stresses in the surface layer results from complex phenomena of the following processes: mechanical-leading to inhomogeneous plastic deformation, thermal-causing thermal plastic flow, and physical-leading to phase transformations and specific volume variation. The experimental results indicate that residual stresses in the surface layer are mostly a consequence of complex interactions of the mechanical and thermal effects leading to inhomogeneous plastic deformation associated with the process of chip formation and an interaction between the tool and the freshly machined surface [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…The type of residual stresses and their level deeply depend on the mechanical properties of the machined material. With an increase of mechanical properties (material hardness, tensile strength, strain rate dependency, thermal conductivity, mechanics of plastification), the level of residual stresses also increases [6,7,9,10]. High mechanical properties and severe work hardening of austenitic stainless steels during the chip formation process, combined with low thermal conductivity generate high cutting forces along with high localized interfacial temperatures and adhesion in the cutting zone which are the main reasons for high level tensile residual stresses both in the hoop and feed direction [5,[10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Residual stresses in surface layer after dry and MQL turning of AISI 316L steel

Leppert

Peng

2012

Prod. Eng. Res. Devel.

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Residual stresses in the surface layer exert a significant impact on functional aspects of machined parts. Their type and value depend on the workpiece and tool material properties, cutting parameters and cooling and lubrication conditions in the tool-chip-machined surface interface. As the effects of material properties and cutting parameters have been widely studied, the influence of cooling and lubrication conditions, especially minimum quantity lubrication (MQL) on the surface layer residual stresses and the relationships between them have not been investigated. In this paper the effects of dry, MQL cutting and cutting with emulsion conditions together with cutting parameters on residual stresses after turning AISI 316L steel were investigated. X-ray diffraction method was used for measuring superficial residual stresses in the cutting (hoop) and feed (axial) directions. Tensile residual stresses were detected in both directions and the values in the cutting direction turned out to be higher than in the feed direction. The effects of cooling and lubrication conditions largely depend on the selected cutting parameters, whose influence is linked to the cutting zone cooling and lubrication mode. Elaborated regression functions allow calculation and optimization of residual stresses in turning AISI 316L steel, depending on cooling and lubrication conditions as well as cutting parameters.

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“…SDSS has a favorable combination of chromium, nickel and molybdenum [1], which provides an attractive combination of mechanical and corrosion properties and is thus widely applied in aggressive corrosion environments such as gas and oil, petrochemical and chemical, industries. These materials are considered difficult to machine because they have low thermal conductivity combined with high tensile strength and high shear strength and during machining they show a high tendency toward work-hardening [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Coated Cutting Tool Performance during Machining of Super Duplex Stainless Steels through 3D Wear Evaluations

et al. 2017

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Abstract:In this study, the wear mechanisms and tribological performance of uncoated and coated carbide tools were investigated during the turning of super duplex stainless steel (SDSS)-Grade UNS S32750, known commercially as SAF 2507. The tool wear was evaluated throughout the cutting tests and the wear mechanisms were investigated using an Alicona Infinite Focus microscope and a scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS). Tribo-film formation on the worn rake surface of the tool was analyzed using X-ray Photoelectron Spectroscopy (XPS). In addition, tribological performance was evaluated by studying chip characteristics such as thickness, compression ratio, shear angle, and undersurface morphology. Finally, surface integrity of the machined surface was investigated using the Alicona microscope to measure surface roughness and SEM to reveal the surface distortions created during the cutting process, combined with cutting force analyses. The results obtained showed that the predominant wear mechanisms are adhesion and chipping for all tools investigated and that the AlTiN coating system exhibited better performance in all aspects when compared with CVD TiCN + Al 2 O 3 coated cutting insert and uncoated carbide insert; in particular, built-up edge formation was significantly reduced.

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

Cited by 14 publications

References 17 publications

Tool wear mechanisms in the machining of steels and stainless steels

Tool wear mechanisms in the machining of steels and stainless steels

Residual stresses in surface layer after dry and MQL turning of AISI 316L steel

Investigation of Coated Cutting Tool Performance during Machining of Super Duplex Stainless Steels through 3D Wear Evaluations

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