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 Failure analysis of stainless steel lanyard wire rope

2019 ◽  
Vol 16 (1) ◽  
Author(s):  
A. Sambasiva Rao ◽  
A. K. Singh
Keyword(s):  
Stainless Steel ◽  
Fracture Surface ◽  
Failure Analysis ◽  
Grain Boundaries ◽  
Wire Rope ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Wire Ropes ◽  
Fracture Surfaces

Present work describes the failure analysis of AISI 304 stainless steel consisting of 7x19 construction lanyard wire rope which has failed during service. The microstructures and properties of failed wire rope have been investigated and compared with unused wire rope. Both the periphery and fracture surface of the wire rope display the presence of corrosion debris enriched with O and Cl. The fracture surfaces of the failed and unused wire ropes display intergranular and dimples, respectively. The lanyard wire rope has been exposed in corrosive atmosphere and failed in intergranular mode due to enrichment of O and Cl along the grain boundaries.

scholarly journals Failure analysis of stainless steel lanyard wire rope

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
A. Sambasiva Rao ◽  
A. K. Singh
Keyword(s):  
Stainless Steel ◽  
Fracture Surface ◽  
Failure Analysis ◽  
Grain Boundaries ◽  
Wire Rope ◽  
304 Stainless Steel ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Wire Ropes ◽  
Fracture Surfaces

Present work describes the failure analysis of AISI 304 stainless steel consisting of 7x19 construction lanyard wire rope which has failed during service. The microstructures and properties of failed wire rope have been investigated and compared with unused wire rope. Both the periphery and fracture surface of the wire rope display the presence of corrosion debris enriched with O and Cl. The fracture surfaces of the failed and unused wire ropes display intergranular and dimples, respectively. The lanyard wire rope has been exposed in corrosive atmosphere and failed in intergranular mode due to enrichment of O and Cl along the grain boundaries.

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.

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