Pure bending creep of SUS 304 stainless steel tubes

2002 ◽  
Vol 2 (6) ◽  
pp. 461-474 ◽  
Author(s):  
Kuo-Long Lee ◽  
Wen-Fung Pan
Keyword(s):  
Stainless Steel ◽  
304 Stainless Steel ◽  
Pure Bending ◽  
Steel Tubes

Pyrolytic carbon filaments and associated catalytic particles formed in steel tubes

1984 ◽  
Vol 42 ◽  
pp. 662-663
Author(s):  
Y. L. Chen ◽  
J. R. Bradley
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Catalyst Particle ◽  
Pyrolytic Carbon ◽  
Plain Carbon Steel ◽  
304 Stainless Steel ◽  
Hydrocarbon Gases ◽  
Steel Tubes ◽  
Filamentous Carbon ◽  
Carbon Filaments

Considerable effort has been directed toward an improved understanding of the production of the strong and stiff ∼ 1-20 μm diameter pyrolytic carbon fibers of the type reported by Koyama and, more recently, by Tibbetts. These macroscopic fibers are produced when pyrolytic carbon filaments (∼ 0.1 μm or less in diameter) are thickened by deposition of carbon during thermal decomposition of hydrocarbon gases. Each such precursor filament normally lengthens in association with an attached catalyst particle. The subject of filamentous carbon formation and much of the work on characterization of the catalyst particles have been reviewed thoroughly by Baker and Harris. However, identification of the catalyst particles remains a problem of continuing interest. The purpose of this work was to characterize the microstructure of the pyrolytic carbon filaments and the catalyst particles formed inside stainless steel and plain carbon steel tubes. For the present study, natural gas (∼; 97 % methane) was passed through type 304 stainless steel and SAE 1020 plain carbon steel tubes at 1240°K.

Residual stress and springback analysis for 304 stainless steel tubes in flexible-bending process

2017 ◽  
Vol 94 (1-4) ◽  
pp. 1317-1325 ◽  
Author(s):  
Yongping Zhou ◽  
Pengfei Li ◽  
Mingzhe Li ◽  
Liyan Wang ◽  
Shuo Sun
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
304 Stainless Steel ◽  
Steel Tubes ◽  
Bending Process

Influence of loading path on formability of 304 stainless steel tubes

2009 ◽  
Vol 52 (8) ◽  
pp. 2263-2268 ◽  
Author(s):  
ShiHong Zhang ◽  
AnYing Yuan ◽  
Bin Wang ◽  
HaiQu Zhang ◽  
ZhongTang Wang
Keyword(s):  
Stainless Steel ◽  
304 Stainless Steel ◽  
Loading Path ◽  
Steel Tubes

Fusion welding of nickel–titanium and 304 stainless steel tubes: Part I: laser welding

2012 ◽  
Vol 24 (8) ◽  
pp. 945-961 ◽  
Author(s):  
Ryan Hahnlen ◽  
Gordon Fox ◽  
Marcelo J Dapino
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
System Integration ◽  
Nickel Titanium ◽  
Fusion Welding ◽  
304 Stainless Steel ◽  
Hydraulic Systems ◽  
Ultimate Shear Strength ◽  
Steel Tubes ◽  
Maximum Width

Due to their large blocking stresses, high recovery strains, and solid-state operation, nickel–titanium actuators can offer substantial weight and space savings relative to traditional electric or hydraulic systems. A challenge surrounding NiTi-based actuators is integration of the NiTi components into a given system; this alloy is difficult and expensive to machine and challenging to weld to itself and structural materials. In this research, we join NiTi and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through laser welding to create joints with weld depths up to 1.65 mm (0.065 in). By joining NiTi to a common structural material that is easily machined and readily welded to other materials, system integration is greatly improved. The joints prepared in this study were characterized through optical microscopy, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and analysis of the resulting fracture surfaces. The average ultimate shear strength of these joints is 429 MPa (62.2 103 lbf/in2) and the resulting fusion zone has a maximum width of 21.9 μm with a maximum hardness of 929 HV, while a possible heat-affected zone in NiTi is limited between 1 and 2 μm over most of the weld.

Laser Welding of Nickel Titanium and 304 Stainless Steel Tubes

2011 ◽  
Author(s):  
Ryan Hahnlen ◽  
Gordon Fox ◽  
Marcelo J. Dapino
Keyword(s):  
Stainless Steel ◽  
Laser Welding ◽  
System Integration ◽  
Nickel Titanium ◽  
304 Stainless Steel ◽  
Hydraulic Systems ◽  
Ultimate Shear Strength ◽  
Steel Tubes ◽  
Maximum Width ◽  
Is Integration

Shape memory nickel-titanium (NiTi) can generate large blocking stresses and high recovery strains, up to 8%, which make NiTi a good candidate for solid state actuators, resulting in substantial weight and space savings when they replace traditional electric or hydraulic systems. A challenge surrounding NiTi based actuators is integration of the NiTi components into a given system; this alloy is difficult and expensive to machine and weld to itself and structural materials. In this research, we join NiTi and 304 stainless steel tubes 9.52 mm (0.375 in) in diameter through laser welding to create joints with weld depths up to 1650 μm (0.065 in). By joining NiTi to a common structural material that is easily machined and readily welded to other materials, the challenges surrounding system integration are reduced. The joints prepared in this study were characterized through optical microscopy, hardness mapping, and mechanical testing. The average ultimate shear strength of these joints is 423 MPa (61.3 ksi) and the resulting HAZ has a maximum width of 21.9 μm with a maximum hardness of 929 HV.

scholarly journals Creep Buckling of 304 Stainless-Steel Tubes Subjected to External Pressure for Nuclear Power Plant Applications

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 536 ◽  
Author(s):  
Byeongnam Jo ◽  
Koji Okamoto ◽  
Naoto Kasahara
Keyword(s):  
Stainless Steel ◽  
Elevated Temperatures ◽  
Failure Time ◽  
External Pressure ◽  
304 Stainless Steel ◽  
Stainless Steel Tube ◽  
Steel Tubes ◽  
Pressure Load ◽  
Creep Buckling ◽  
Buckling Failure

The creep-buckling behaviors of cylindrical stainless-steel tubes subjected to radial external pressure load at elevated temperatures—800, 900, and 1000 °C—were experimentally investigated. Prior to the creep-buckling tests, the buckling pressure was measured under each temperature condition. Then, in creep-buckling experiments, the creep-buckling failure time was measured by reducing the external pressure load for two different tube specimens—representing the first and second buckling modes—to examine the relationship between the external pressure and the creep-buckling failure time. The measured failure time ranged from <1 min to <4 h under 99–41% loading of the buckling pressure. Additionally, an empirical correlation was developed using the Larson–Miller parameter model to predict the long-term buckling time of the stainless-steel tube column according to the experimental results. Moreover, the creep-buckling processes were recorded by two high-speed cameras. Finally, the characteristics of the creep buckling under radial loading were discussed with regard to the geometrical imperfections of the tubes and the material properties of the stainless steel at the high temperatures.

Fusion welding of nickel–titanium and 304 stainless steel tubes: Part II: tungsten inert gas welding

2012 ◽  
Vol 24 (8) ◽  
pp. 962-972 ◽  
Author(s):  
Gordon Fox ◽  
Ryan Hahnlen ◽  
Marcelo J Dapino
Keyword(s):  
Stainless Steel ◽  
Solid State ◽  
System Integration ◽  
Nickel Titanium ◽  
Fusion Welding ◽  
Inert Gas ◽  
304 Stainless Steel ◽  
Tungsten Inert Gas Welding ◽  
Steel Tubes ◽  
Welding Processes

Shape memory nickel–titanium is attractive for lightweight actuators as it can generate large blocking stresses and high recovery strains through solid-state operation. A key challenge is the integration of the nickel–titanium components into systems; this alloy is difficult and expensive to machine and challenging to weld to itself and other materials. In this research, we join nickel–titanium and 304 stainless steel tubes of 9.53 mm (0.375 in) in diameter through tungsten inert gas welding. By joining nickel–titanium to a common structural material that is easily machined and readily welded to other materials, the system integration challenges are greatly reduced. The joints prepared in this study were subjected to optical microscopic inspection, hardness mapping, energy dispersive X-ray spectroscopy, mechanical testing, and failure surface analysis via scanning electron microscopy. The affected zone from welding is approximately 125 µm (0.005 in) wide including partially mixed zones with a maximum hardness of 817 HV and a possible heat-affected zone of 1–2 µm (39–79 µin) wide. The maximum average ultimate torsional strength is 415 MPa (60.2 x 103 lbf/in2). Implementation of this joining method is demonstrated in the construction of a solid-state torsional actuator that can lift a weight of 2.3 kg (5 lb) to a distance of 610 mm (24 in). The laser and TIG welding processes are compared.

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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