scholarly journals On the tensile creep behaviour of a directionally-solidified Ni3Al-based alloy

1993 ◽  
Vol 16 (1) ◽  
pp. 63-72
Author(s):  
M S Gopala Krishna ◽  
M C Pandey
Keyword(s):  
Creep Behaviour ◽  
Tensile Creep ◽  
Directionally Solidified

Development of a Corrosion Resistant Directionally Solidified Material for Land Based Turbine Blades

1997 ◽  
Author(s):  
N. S. Cheruvu
Keyword(s):  
Turbine Blades ◽  
Grain Structure ◽  
Tensile Creep ◽  
Screening Tests ◽  
Directionally Solidified ◽  
Corrosion Resistant ◽  
Cooling Flow ◽  
Property Evaluation ◽  
Temperature Capability ◽  
Operating Stress

Advanced turbines with improved efficiency require materials that can operate at higher temperatures. Availability of these materials would minimize cooling flow requirements and thus, improve the efficiency of a turbine. Advanced processing such as directional solidification (DS), can improve temperature capability of the majority of Ni based superalloys. However, results of earlier work on IN-738 reveal that the DS process does not significantly improve temperature capability of this alloy. A research program was initiated to develop a corrosion resistant Ni-based DS blade material for land-based turbines. In this program, eight heats with varied Cr, Al, Ti, Ta, and W contents were selected for evaluation. Screening tests performed on these heats in the DS condition include tensile, creep, and corrosion. The results of experimental heats were compared with those of IN-738 in the equiaxed condition. From these results, two chemistries offering approximately 100°F temperature advantage at typical row 1 turbine blade operating stress, were selected for castability and further mechanical property evaluation. Several row 1 solid and cored turbine blades were successfully cast. The blades were evaluated for grain structure and mechanical properties. Tests were also conducted to evaluate the effects of withdrawal rates on properties. These results are summarized in this paper.

Tensile creep behaviour of polymethylpentene-silica nanocomposites

2010 ◽  
Vol 59 (6) ◽  
pp. 719-724 ◽  
Author(s):  
Andrea Dorigato ◽  
Alessandro Pegoretti
Keyword(s):  
Creep Behaviour ◽  
Tensile Creep ◽  
Silica Nanocomposites

Microstructure and Creep Properties of AJ62 and AE44 Die-Casting Magnesium Alloys

2010 ◽  
Vol 638-642 ◽  
pp. 1546-1551 ◽  
Author(s):  
Andrzej Kiełbus ◽  
Tomasz Rzychoń
Keyword(s):  
Magnesium Alloys ◽  
Creep Resistance ◽  
Cell Structure ◽  
Creep Behaviour ◽  
Die Casting ◽  
Tensile Creep ◽  
Creep Properties ◽  
Die Cast ◽  
Subgrain Formation ◽  
Good Creep Resistance

Microstructure and tensile creep behaviour of the die-cast AE44 and AJ62 magnesium alloys has been studied at temperatures between 175°C and 200°C and at stresses in the range from 60 to 75 MPa. At the 175°C the AJ62 and AE44 alloys exhibit good creep resistance after 120h creep deformation. At 200°C the AE44 alloy shows still good creep resistance, whereas in the case of AJ62 alloy the rapid decreasing of creep resistance has been observed. TEM observations reveal dislocations cell structure in AE44 alloy after creep test. In AJ62 alloy subgrain formation and decreasing the dislocation density have been observed.

A Reference Stress Approach to Creep Bending of Straight Tubes

1974 ◽  
Vol 16 (3) ◽  
pp. 125-138 ◽  
Author(s):  
J. Fairbairn
Keyword(s):  
Entire Range ◽  
Creep Behaviour ◽  
Tensile Creep ◽  
Bending Moments ◽  
Stress Distributions ◽  
Creep Tests ◽  
Reference Stress ◽  
Hyperbolic Sine ◽  
Rotation Method ◽  
Reference Stress Approach

Reference-stress parameters, based on the Norton constitutive equation, are developed for creep bending of circular and elliptical tubes. The parameters are presented in the form of a design chart. The reference stress methods apply also to other simple constitutive equations of the power law, exponential and hyperbolic sine forms, and also to two complex equations describing creep behaviour over the entire range from primary to tertiary. In these equations the functions of stress and time are not separable and reference stress techniques provide a convenient method of evaluating stationary stress distributions and investigating the variation of these stresses with time. Aluminium alloy tubes were creep tested with cyclic uniform bending moments. Creep strains to fracture were measured by an end-rotation method. The creep behaviour of the tubes was well predicted by reference-stress cyclic tensile creep tests.

Development of Creep Damage in Similar Weld Joints of P92 Steel Pipe

2017 ◽  
Vol 270 ◽  
pp. 162-167
Author(s):  
Petr Král ◽  
Vaclav Sklenička ◽  
Květa Kuchařová ◽  
Marie Svobodová ◽  
Marie Kvapilová ◽  
...  
Keyword(s):  
Welded Joints ◽  
Creep Behaviour ◽  
Creep Damage ◽  
Electron Back Scatter Diffraction ◽  
Steel Pipe ◽  
Tensile Creep ◽  
Creep Tests ◽  
P92 Steel ◽  
Welding Technology ◽  
Fracture Ductility

The microstructure and creep behaviour of the welded joints of P92 steel pipe were investigated in order to determine the influence of orbital heat welding technology on the creep resistance. Creep specimens were machined from the welded joints. Tensile creep tests of welded joints were performed at 873 K using different stresses. The microstructure of tested specimens was investigated by scanning electron microscope Tescan equipped with an electron-back scatter diffraction. The creep results showed that the creep fracture strain of the welded joints decreases with decreasing value of applied stress. Microstructure investigation showed that fracture behaviour of welded joints is influenced by an enhanced cavity formation at grain boundaries in the heat-affected zone causing lower fracture ductility.

Tensile creep behaviour of NiAl-Cr(Zr) multiphase intermetallic alloy

2003 ◽  
Vol 19 (3) ◽  
pp. 399-402 ◽  
Author(s):  
Y. H. Qi ◽  
J. T. Guo ◽  
C. Y. Cui
Keyword(s):  
Creep Behaviour ◽  
Intermetallic Alloy ◽  
Tensile Creep

Influence of additions of Sb and/or Sr on microstructure and tensile creep behaviour of squeeze-cast AZ91D Mg alloy

2017 ◽  
Vol 683 ◽  
pp. 37-45 ◽  
Author(s):  
Punit Kumar ◽  
A.K. Mondal ◽  
S.G. Chowdhury ◽  
G. Krishna ◽  
Ashok Kumar Ray
Keyword(s):  
Creep Behaviour ◽  
Mg Alloy ◽  
Tensile Creep ◽  
Squeeze Cast
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