Effects of surface laser treatments on microstructure, tension, and fatigue behavior of AISI 316LVM biomedical wires

Lavvafi, Hossein; Lewandowski, Mark E.; Schwam, David; Lewandowski, John J.

doi:10.1016/j.msea.2017.01.083

Cited by 39 publications

(34 citation statements)

References 16 publications

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“…al developed a method, which combines the small feature size of a femtosecond laser with faster material removal rates associated with traditional milling techniques. They presented a method to machine plates of micro‐channel heat exchangers and introduced an approach for fatigue studies of components under strain‐controlled cyclic fatigue loading . Figure represents the laser‐machined sheet of 316 stainless with different channel spacing after micromachining is completed.…”

Section: Literature and Discussionmentioning

confidence: 99%

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Recent advantages in laser fabrication of micro‐channel heat exchangers

Mehrpouya

Emamian

2017

Materialwissenschaft Werkst

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Micro‐channel heat exchangers transfer more heat because of having a greater surface area compared to the conventional generation. This principle advantage can be applied widely in various industries for waste heat recovery purposes. Laser micromachining is a unique fabrication process, which presents some challenges. The main drawback of laser processes is introduction of residual stresses, which create distortion on the surface of heat‐affected areas. This study investigates some recent improvement in the fabrication methods of micro‐channel heat exchangers and concludes the strategies to control the distortion.

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Section: Literature and Discussionmentioning

confidence: 99%

“… Laser machined sheet of 316 stainless with different channel spacing Laserbearbeitete Platte aus rostfreiem Stahl 316 mit variierendem Abstand der Kanäle …”

Section: Literature and Discussionunclassified

Recent advantages in laser fabrication of micro‐channel heat exchangers

Mehrpouya

Emamian

2017

Materialwissenschaft Werkst

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“…Tubes at the 5th and 6th rows, where the failure is observed, are made of AISI 304 stainless steels. The temperature at 5th and 6th rows is approximately 500 • C. Austenitic stainless steel AISI 304 is known to have an excellent combination of high temperature mechanical properties, high temperature corrosion resistance, and superior structural stability [1][2][3][4][5][6], making it a popular choice for convection tubes for temperature range 500 to 700 • C. Tubes in similar working conditions are reported to be failed due to oxidation, erosion, creep, thermal fatigue and stress relaxation cracking [7][8][9][10][11][12][13][14][15][16][17]. Depending on the working condition, either of these mechanisms or a combination of them can control the damage.…”

Section: Introduction and Case Backgroundmentioning

confidence: 99%

A Study on the Failure of AISI 304 Stainless Steel Tubes in a Gas Heater Unit

Bahrami

Taheri

2019

Metals

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This paper investigates a failure in convection section tubes of a gas heater unit in a petrochemical plant. Tubes are made of AISI 304 stainless steel. The failure is reported after 5 years of service at working temperature 500 °C. The failure is in the form of circumferential cracks in the vicinity of the weld. Various characterization techniques, including optical and electron microscopes as well as energy-dispersive X-ray spectroscopy (EDS), were used to study the failure. Results showed that that the damage has initiated in the heat affected zone (HAZ) area parallel to the weld/base metal interface. Cracks have propagated alongside grain boundaries, resulting in an intergranular fracture. The main cause of failure was concluded to be attributable to the grain boundary sensitization and intergranular grain boundary attack due to improper welding and long time exposure of tubes to high temperature. Possible mitigation strategies to minimize similar failures will be discussed.

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“…Some of these deficiencies can be overcome by adding alloying elements as in the case of stainless steels. 3 By adding a few layers on the surface of a metal through electroless process most of the surface characteristics can be improved to reach in an appropriate level. Ni electroless is used particularly for making a uniform and continuous metal coating.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Electroless Bath Parameters and Heat Treatment on the Properties of Ni-P and Ni-P-Cu Composite Coatings

et al. 2018

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NiP -(Cu) composite coatings were applied on a St37 steel in an acidic bath of hypophosphite composite. The effect of the concentration of the Cu particles and pH of the solutionon the amount of Ni and P of the coatings, their morphology, and hardness of the coatings were explored. Some of the coated samples were also heat treated at 400ºC for 1 hour. The phases formed, the microstructure and the amount of the alloying elements of the coatings were analyzed by X-Ray powder diffraction (XRD), Scanning Electron Microscope (SEM) equiped with Energy Dispersive Spectroscopy (EDS). Results show that although adding Cu particles reduced the hardness of NiP coating (from 482.4 to 351.2 VH in 1 gr/lit Cu), within NiP -Cu composite coatings the hardness of NiP -Cu composite coating increased from 351.2 to 380.7 VH by increasing the Cu particles from 1 to 7 gr/lit. The structure of the coating was crystalline during the heat treatment making the coating harder. With increasing the pH of the solution from 4.5 to 7 and then to 9, the weight percent of P and the particle of Cu were reduced.

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Effects of surface laser treatments on microstructure, tension, and fatigue behavior of AISI 316LVM biomedical wires

Cited by 39 publications

References 16 publications

Recent advantages in laser fabrication of micro‐channel heat exchangers

Recent advantages in laser fabrication of micro‐channel heat exchangers

A Study on the Failure of AISI 304 Stainless Steel Tubes in a Gas Heater Unit

The Effect of Electroless Bath Parameters and Heat Treatment on the Properties of Ni-P and Ni-P-Cu Composite Coatings

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