scholarly journals Surface Texture after Turning for Various Workpiece Rigidities

Machines ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 9
Author(s):  
Michal Dobrzynski ◽  
Karolina Mietka
Keyword(s):  
Surface Texture ◽  
Surface Characteristics ◽  
304 Stainless Steel ◽  
Aisi 304 ◽  
Aisi 304 Steel ◽  
Surface Irregularities ◽  
Surface Microgeometry ◽  
Surface Profiles ◽  
Turned Parts ◽  
Positive Effect

In the paper, we present an analysis of the surface texture of turned parts with L/D (length/diameter) ratios of 6 and 12 and various rigidity values. The studies were carried out on samples made of S355JR steel and AISI 304 stainless steel. A detailed analysis of 2D surface profiles was carried out by using a large number of parameters that allowed us to distinguish significant differences in the surface microgeometry, which confirmed that determining surface characteristics from one height parameter (Ra—arithmetical mean height) is far from sufficient. The obtained results indicate significantly better roughness and waviness values of the AISI 304 steel surfaces in terms of its size, periodicity, and regularity. Therefore, the turning process of AISI 304 shafts with low rigidity allows one to be able to achieve better quality texture and have a positive effect on the general properties of a workpiece. In all tested samples, surface irregularities decreased along with the distance from the tailstock. The shafts with an L/D ratio of 12 had worse surfaces in the first two sections due to lower rigidity. The results received close to the three-jaw chuck, regardless of the L/D ratio and material type, demonstrated similar waviness and roughness parameters and profiles.

Effect of Phosphoric Acid Treatment on Isothermal High Temperature Oxidation Behaviour of AISI 304 Stainless Steel at 800°C

2012 ◽  
Vol 323-325 ◽  
pp. 359-364
Author(s):  
F. Riffard ◽  
Henri Buscail ◽  
F. Rabaste ◽  
Christophe Issartel ◽  
Sébastien Perrier
Keyword(s):  
High Temperature ◽  
Phosphoric Acid ◽  
Acid Treatment ◽  
High Temperature Oxidation ◽  
304 Stainless Steel ◽  
Protective Oxide ◽  
Temperature Oxidation ◽  
Aisi 304 ◽  
Oxidation Test ◽  
Aisi 304 Steel

Phosphoric acid treatment is used as a way to improve the high temperature oxidation resistance of a chromia-forming AISI 304 steel. Chromia-forming steels are excellent candidates to resist to high temperature oxidizing atmospheres because of the formation of protective oxide scales. The oxide scale growth mechanisms are studied by exposing phosphoric acid-treated and untreated 304 steel samples to high temperature conditions in air. The analyses were carried out by means of thermogravimetry, andin situX-ray diffraction (XRD). The experimental results show that the phosphoric acid treatment does not have a beneficial effect on cyclic high temperature oxidation (up to 70h of the oxidation test) of AISI 304 steel because of growth of a layer mainly formed by external cation diffusion which grows very quickly. The isothermal high temperature oxidation of this steel at 800°C in air shows a very fast initial iron oxidation towards the external interface, allowing to chromium element to be more available to the internal interface to form a continuous chromia layer, thus causing the establishment of a parabolic oxidation regime and leading to a beneficial reduction of the oxidation rate (after 70h of the oxidation test).

The Effect of Tool Flexibility on Back-Cutting in End Milled Surfaces

1999 ◽  
Vol 121 (3) ◽  
pp. 532-537 ◽  
Author(s):  
S. N. Melkote ◽  
J. W. Sutherland ◽  
C. King
Keyword(s):  
Cutting Force ◽  
Surface Texture ◽  
Surface Characteristics ◽  
End Mill ◽  
Force System ◽  
Feed Force ◽  
Milled Surface ◽  
Cutting Effect ◽  
Surface Profiles ◽  
Good Agreement

End milled surface texture is inhomogeneous and often exhibits complex lay patterns. An important contributing factor to these surface characteristics is the back-cutting effect. This effect causes cutter tooth mark patterns on the surface in the forward and reverse tool feed directions. In this paper, the dependence of back-cutting on end mill flexibility and its influence on the slot floor surface texture are modeled and experimentally verified. It is shown that the extent to which tool flexibility affects back-cutting is determined by the resultant cutting force system and not the feed force alone. The variation in the amount of back-cutting typically observed across the width of a milled slot is also explained by this model. The model, although simple in form, yields reasonably good agreement with the measured surface profiles.

Theoretical Prediction of Thickness Distribution on Warm Deep Drawn AISI 304 Steel Cup

2015 ◽  
Vol 766-767 ◽  
pp. 974-981
Author(s):  
N. Ethiraj ◽  
P. Ganesh ◽  
V.S. Senthil Kumar
Keyword(s):  
Deep Drawing ◽  
Room Temperature ◽  
Thickness Distribution ◽  
Research Work ◽  
Austenitic Stainless Steels ◽  
304 Stainless Steel ◽  
Recrystallization Temperature ◽  
Aisi 304 ◽  
Warm Deep Drawing ◽  
Aisi 304 Steel

Warm deep drawing is a non-conventional deep drawing process which is performed by applying heat in the conventional deep drawing, at the same time keeping the blank below the recrystallization temperature. Austenitic stainless steels like AISI 304 are widely used in food and automotive industries. Most of the current research work in warm deep drawing has been focussing on experimental and numerical simulation only. In this work, a new methodology is proposed to calculate the thickness distribution of the warm deep drawn circular cup from AISI 304 stainless steel sheet of 1.0 mm thickness analytically at temperatures ranging from room temperature to 300°C. The results of the theoretical approach show a reasonably good correlation with the experimental results.

Fractal Analysis of the Microstructure of Aisi 304 Steel.

1995 ◽  
Vol 407 ◽  
Author(s):  
M. Hinojosa ◽  
V. Trejo ◽  
U. Ortiz
Keyword(s):  
Grain Boundaries ◽  
Fractal Analysis ◽  
Tensile Strain ◽  
Fractal Dimensions ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Steel Microstructure ◽  
Aisi 304 Steel ◽  
Structure Dimension

ABSTRACTThe present work reports the results of fractal analysis of the grain boundaries of AISI 304 stainless steel. Microstructure in the non deformed condition is compared against microstructure with 50% tensile strain. Observations were made by optical microscopy, magnifications used were 50, 100, 200, 400, and 1000x. Measurements were made over digitized images using image analysis. Fractal dimension of the grain boundaries were obtained using Richardson plots of perimeter against yardstick length. Our results agree well with reported values for different natural fractal curves. We found that, in general, grains exhibit two different fractal dimensions: one structure dimension that gives information about the morfology of the grain and one texture dimension which accounts for the fine details of the grain boundary.

scholarly journals Effect of Disk Laser Beam Offset on the Microstructure and Mechanical Properties of Copper—AISI 304 Stainless Steel Dissimilar Metals Joints

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1294 ◽  
Author(s):  
Miroslav Sahul ◽  
Ema Tomčíková ◽  
Martin Sahul ◽  
Matej Pašák ◽  
Barbora Ludrovcová ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Laser Beam ◽  
Weld Metal ◽  
Welded Joints ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Copper Sheet ◽  
Aisi 304 ◽  
Aisi 304 Steel

Deoxidized oxygen free copper C12200, 1 mm in thickness, was welded to 1-mm thick AISI 304 stainless steel with disk laser. The butt-welded joints were produced with different welding parameters. Full factorial design of experiment (DoE) approach consisting of three factors and two levels was utilized. Laser powers used for welding were 1.3 and 1.9 kW and welding speeds of 20 and 30 mm/s. Two beam offsets were tested, namely, 100 μm toward copper side and 200 μm toward AISI 304 steel. It was found that beam offset possesses the largest influence on the welded joints’ tensile strength. Tensile strengths attained values more than 3.7 times higher in comparison to the AISI 304 steel beam offset. When lower laser power was used, the higher tensile strength was attained for copper sheet offset. Higher microhardness was observed when laser beam was offset to AISI 304 steel side. The average microhardness of the weld metal was higher than that of the weaker base material, copper sheet. Energy dispersive X-ray spectroscopy (EDS) analysis confirmed the heterogeneity in elemental composition across the welded joint interface, being lower when laser beam was offset to AISI 304 steel side. On the other hand, the copper content dropped to the average composition of weld metal at the distance of about 140 μm from copper-weld metal interface.

Comparison of Recovery and Recrystallization in Stainless Steel Following Plane-Wave Shock Loading and Explosive Forming

1970 ◽  
Vol 28 ◽  
pp. 428-429 ◽  
Author(s):  
J. A. Korbonski ◽  
L. E. Murr
Keyword(s):  
Stainless Steel ◽  
Shock Loading ◽  
Pressure Pulse ◽  
Shock Pressure ◽  
304 Stainless Steel ◽  
Strain Rates ◽  
Two Dimensional ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Explosive Forming

Comparison of recovery rates in materials deformed by a unidimensional and two dimensional strains at strain rates in excess of 104 sec.−1 was performed on AISI 304 Stainless Steel. A number of unidirectionally strained foil samples were deformed by shock waves at graduated pressure levels as described by Murr and Grace. The two dimensionally strained foil samples were obtained from radially expanded cylinders by a constant shock pressure pulse and graduated strain as described by Foitz, et al.

Optimization of Cutting Parameters Considering Surface Roughness When Milling AISI 304 Steel Using Coated Wc-Co and Tialn / Wc-Co Coated

2019 ◽  
Author(s):  
Murilo Pereira Lopes ◽  
Jose Rubens Gonçalves Carneiro ◽  
Gilmar Cordeiro da Silva ◽  
Carlos Eduardo Santos ◽  
Ítalo Bruno dos Santos
Keyword(s):  
Surface Roughness ◽  
Cutting Parameters ◽  
Aisi 304 ◽  
Aisi 304 Steel ◽  
Optimization Of Cutting Parameters
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