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

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.

Effects of Strain Amplitude and Loading Path on Cyclic Behavior and Martensitic Transformation of 304 Stainless Steel

2018 ◽  
Author(s):  
Yajing Li ◽  
Dunji Yu ◽  
Xu Chen
Keyword(s):  
Stainless Steel ◽  
Martensitic Transformation ◽  
Strain Amplitude ◽  
Cyclic Deformation ◽  
Deformation Behavior ◽  
Secondary Hardening ◽  
304 Stainless Steel ◽  
Loading Path ◽  
Martensite Content ◽  
Number Of Cycles

Effects of strain amplitude and loading path on cyclic deformation behavior and martensitic transformation of 304 stainless steel were experimentally investigated at room temperature. Series of symmetrical strain-control low cycle fatigue tests with strain amplitude ranging from 0.4% to 1.0% and various loading paths (uniaxial, torsional, proportional, rhombus, square and circular) with the same equivalent strain amplitude of 0.5% were carried out. Three-stage cyclic deformation behavior containing initial hardening, cyclic softening or saturation, and secondary hardening as well as near-linear relationship between α’-martensite content and number of cycles was observed during the whole life regime as for each test. Besides, a nearly linear relation between peak stress and α’-martensite content was found during secondary hardening stage. Furthermore, higher strain amplitude or non-proportionality of loading path resulted in higher cyclic stress response and α’-martensite content growth rate, defined by the slope of curves of α’-martensite content versus number of cycles.

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

A New Nonproportional Low Cycle Fatigue Life Prediction Method for Type 304 Stainless Steel

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Bowen Liu ◽  
Xiangqiao Yan
Keyword(s):  
Stainless Steel ◽  
Fatigue Life ◽  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Prediction Method ◽  
Fatigue Life Prediction ◽  
New Method ◽  
304 Stainless Steel ◽  
Loading Path ◽  
Prediction Approach

A new method is put forward to predict fatigue life for low cycle nonproportional loading based on the Itoh criterion. The proposed method considers the multi-axiality influence on the reference maximum principal strain path and the calculation of nonproportionality factor Fnp by utilizing a multi-axial fatigue life prediction approach based on the modified Wöhler curve method. Different from the hypothesis of previous integral models for computing factor Fnp where the loading path is considered uniform, a new model using an inhomogeneous integral is presented and a path-dependent weight factor is defined to describe this inhomogeneity. The experimental tests of Itoh on 304 stainless steel with 14 different loading cases are referenced to examine the validity of the new method.

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

Effect of Process Parameters on Hydroforming of Stainless Steel Tubular Components with Rectangular Section

2013 ◽  
Vol 749 ◽  
pp. 67-74 ◽  
Author(s):  
Yong Xu ◽  
Shi Hong Zhang ◽  
Qing Xun Zhu ◽  
Ming Cheng ◽  
Hong Wu Song ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Process Parameters ◽  
304 Stainless Steel ◽  
Loading Path ◽  
Rectangular Section ◽  
Loading Paths ◽  
Tubular Components

The effects of key process parameters including initial lengths of tube blank, forming velocity and loading paths on hydroformability of stainless steel tubular components with rectangular section were systematically investigated. The results showed that sufficient axial feed must be given before the tube contacting the surface of die in order to prevent the excessive thickness thinning, especially for longer tube blank. The lower loading velocity led to enhanced formability. It is more important that pulsating loading path observably improved the formability of 304 stainless steel.

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.

Sign in / Sign up

Export Citation Format

Share Document