scholarly journals Final test specification Inconel-718 materials test 37/W410. Tubular specimens 15W/202. Stress relaxation specimens 15/W101

1968 ◽  
Author(s):  
D.L. Burwell
Keyword(s):  
Stress Relaxation ◽  
Inconel 718 ◽  
Final Test ◽  
Test Specification ◽  
Tubular Specimens

STRESS RELAXATION BEHAVIOUR AND MECHANISM OF HEAT TREATED INCONEL 718 IN HIGH TEMPERATURE ENVIRONMENTS

2013 ◽  
Vol 21 (1) ◽  
pp. 43-51
Author(s):  
O. Bapokutty ◽  
◽  
Z. Sajuri ◽  
J. Syarif ◽  
◽  
...  
Keyword(s):  
High Temperature ◽  
Stress Relaxation ◽  
Inconel 718 ◽  
Relaxation Behaviour ◽  
Heat Treated

Stress Relaxation Behavior of Heat Treated Inconel 718

2012 ◽  
Vol 12 (9) ◽  
pp. 870-875 ◽  
Author(s):  
O. Bapokutty ◽  
Z. Sajuri ◽  
J. Syarif
Keyword(s):  
Stress Relaxation ◽  
Inconel 718 ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Heat Treated

Stress-relaxation in bending of Inconel 718, at 773 and 823 K

1988 ◽  
Vol 23 (1) ◽  
pp. 241-247 ◽  
Author(s):  
F. Povolo ◽  
J. F. Reggiardo
Keyword(s):  
Stress Relaxation ◽  
Inconel 718

Characterization of Precipitation Kinetics of Inconel 718 Superalloy by the Stress Relaxation Technique

2012 ◽  
Vol 706-709 ◽  
pp. 2393-2399 ◽  
Author(s):  
Jessica Calvo ◽  
She Yu Shu ◽  
Jose María Cabrera
Keyword(s):  
Mechanical Properties ◽  
Stress Relaxation ◽  
Inconel 718 ◽  
Relaxation Times ◽  
Precipitation Kinetics ◽  
Nickel Chromium ◽  
Phase Intermetallic ◽  
Δ Phase ◽  
Inconel 718 Superalloy

Inconel 718 is a nickel-chromium-iron superalloy which presents excellent mechanical properties at high temperatures, as well as good corrosion resistance and weldability. These characteristics can be optimized with an appropriate control of microstructural features such as grain size and precipitation. Precipitates of different nature can form in these alloys, i.e. γ’’ (a metastable metallic compound Ni3Nb), γ’ (Ni3(Ti, Al), carbides and/or δ phase (intermetallic Ni3Nb). Aging treatments are usually designed to obtain the precipitation required in order to optimize mechanical properties. However, precipitation can also appear induced by deformation and therefore interfere with hot forming operations, such as forging. Under these conditions, precipitation may lead to an increase of the loads required to carry out the process. The aim of the work was the characterization of precipitation kinetics for Inconel 718. With this purpose, stress relaxation tests were carried out at temperatures ranging from 950°C to 800°C. Moreover, different amounts of deformation were applied to the samples, prior to stress relaxation, to evaluate the effect of this variable on inducing precipitation. Some samples were quenched at different relaxation times for metallographic evaluation. The results obtained through mechanical testing, together with a proper characterization of precipitation by Scanning Electron Microscopy, were the basis for obtaining precipitation-time-temperature (PTT) diagrams after different deformation conditions.

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