The Dependence of the Notch Sensitivity of Waspaloy at 1000–1400 Deg F on the Gamma Prime Phase

1973 ◽  
Vol 95 (1) ◽  
pp. 15-20 ◽  
Author(s):  
D. J. Wilson
Keyword(s):  
Mechanical Behavior ◽  
Dislocation Motion ◽  
Time Dependent ◽  
Notch Sensitivity ◽  
Motion Mechanism ◽  
Gamma Prime ◽  
Edge Notch ◽  
Prime Phase

The morphology of the gamma prime phase was correlated with the mechanical behavior of Waspaloy sheet at 1000–1400 deg F. “Overaging” eliminated time-dependent edge-notch sensitivity and produced a change in the dislocation motion mechanism from shearing to bypassing the gamma prime particles.

scholarly journals Relationship of Mechanical Characteristics and Microstructural Features to the Time-Dependent Edge-Notch Sensitivity of Inconel 718 Sheet

1973 ◽  
Vol 95 (2) ◽  
pp. 112-123 ◽  
Author(s):  
D. J. Wilson
Keyword(s):  
Inconel 718 ◽  
Mechanical Characteristics ◽  
Rupture Life ◽  
Dislocation Motion ◽  
Time Dependent ◽  
Notch Sensitivity ◽  
Motion Mechanism ◽  
Notched Specimens ◽  
Edge Notch ◽  
Relationship Of

Time-dependent notch sensitivity of Inconel 718 sheet was observed at 900 deg F to 1200 deg F (482–649 deg C). It occurred when edge-notched specimens were loaded below the yield strength and smooth specimen tests showed that small amounts of creep consumed large rupture life fractions. The severity of the notch sensitivity was reduced by decreasing the temperature of the solution treatments, increasing the time and/or temperature of aging and increasing the test temperature to 1400 deg F (760 deg C). Elimination of time-dependent notch sensitivity correlated with a change in dislocation motion mechanism from shearing to bypassing precipitate particles.

Effect of rhenium and cobalt additions on the microstructure and gamma prime phase stability of vacuum arc melted modified nickel-based superalloys grade MGA 1400

2019 ◽  
Vol 61 (7) ◽  
pp. 609-617 ◽  
Author(s):  
Arpaporn Nararak ◽  
Panyawat Wangyao ◽  
Tanaporn Rojhirunsakool ◽  
Gobboon Lothongkum
Keyword(s):  
Phase Stability ◽  
Vacuum Arc ◽  
Gamma Prime ◽  
Prime Phase

INCONEL ALLOY 718SPF

Alloy Digest ◽  
1994 ◽  
Vol 43 (11) ◽  
Keyword(s):  
Base Alloy ◽  
Low Flow ◽  
Inconel Alloy ◽  
Gamma Prime ◽  
Size Stability ◽  
Super Plastic ◽  
Plastic Forming ◽  
Super Plastic Forming ◽  
Grain Size Stability ◽  
Prime Phase

Abstract INCONEL alloy 718SPF is an age-hardenable austenitic material whose strength is largely dependent on the precipitation of a gamma prime phase following heat treatment. The base alloy, however, possesses two-essential characteristics for super-plastic forming; grain size stability over time and temperature; and a combination of low flow stress and significant ductility. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties as well as creep and fatigue. It also includes information on low and high temperature performance. Filing Code: Ni-471. Producer or source: Inco Alloys International Inc.

scholarly journals Time-dependent mechanical behavior of lime-mortar masonry

2010 ◽  
Vol 44 (1) ◽  
pp. 29-42 ◽  
Author(s):  
Els Verstrynge ◽  
Luc Schueremans ◽  
Dionys Van Gemert
Keyword(s):  
Mechanical Behavior ◽  
Time Dependent ◽  
Lime Mortar

scholarly journals Time-dependent alterations in the deformability of human neutrophils in response to chemotactic activation

Blood ◽  
1990 ◽  
Vol 76 (12) ◽  
pp. 2606-2612 ◽  
Author(s):  
RS Frank
Keyword(s):  
Mechanical Behavior ◽  
Control Level ◽  
Colchicine Treatment ◽  
Time Dependent ◽  
Cell Stiffness ◽  
Human Neutrophils ◽  
Partial Recovery ◽  
Cell Deformability ◽  
Two Phase ◽  
Transit Times

Abstract Transit times of individual human neutrophils through single capillary- sized pores were measured to determine the time-dependent changes in the mechanical behavior of the cells during activation by the chemotactic agent formyl-methionyl-leucyl-phenylalanine (FMLP) and in response to cytochalasin B (CTB) and colchicine. FMLP elicited a two- phase response consisting of a rapid increase in cell stiffness, which peaked between 2 and 3 minutes, followed by a partial recovery of deformability to a level significantly above that of control after 5 minutes. The mechanical changes closely followed changes in F-actin content, although the peak in cell stiffness appeared to lag the F- actin response. Treatment with 3 mumols/L CTB produced a transient decrease in cell rigidity followed by a return to control level in 10 minutes, whereas treatment with 30 mumols/L CTB resulted in a sustained decrease in cell transit times to a level 60% of control. Addition of 3 mumols/L CTB to cells prestimulated with FMLP produced a rapid (1 to 2 minutes) cessation of changes in cellular deformability produced by the FMLP. Colchicine treatment did not decrease cell rigidity, but produced a delayed increase in F-actin content accompanied by increased stiffness of the cells. These results implicate actin as the major determinant of the mechanical behavior of the neutrophil, as measured by whole cell deformability tests. The significant changes in cell deformability that occur in response to fractional changes in F-actin content suggest that changes in the structure of the actin network occur during these processes.

Microstructure Evolution of Nickel-Based Superalloys Induced by Thermomechanical Processing - Simulation and Verification

2018 ◽  
Vol 385 ◽  
pp. 424-429 ◽  
Author(s):  
Shamil Mukhtarov ◽  
Farid Z. Utyashev ◽  
Ruslan Shakhov
Keyword(s):  
Microstructure Evolution ◽  
Thermomechanical Processing ◽  
Strain Rates ◽  
Microstructure Formation ◽  
Turbine Engine ◽  
Fine Grained ◽  
Gamma Prime ◽  
Deflected Mode ◽  
Fine Grained Structure ◽  
Prime Phase

It is known that different parts of the gas turbine engine discs are operated at different temperature and load. Therefore, it is advisable to make such components out of nickel-based superalloys with a regulated structure that provides them the best operational properties. It is important to know the thermomechanical treatment for their processing to form such structures. Research of the deformation behavior and the microstructure evolution of nickel-based superalloys were carried out on small specimens. The accumulated strains and the stress distribution in specimens were determined during simulation. It is possible to predict structure formation on the basis of a deflected mode. Verification was carried out by isothermal upsetting of specimens out of superalloys at the temperature and strain rates determined by simulation. Thermomechanical treatments of the superalloys for different microstructure formation were defined. The features of the microstructure formation are shown depending on the chemical and phase composition of the alloys. Hot deformation of the ATI Allvac 718Plus superalloy leads to dissolution of the gamma prime phase that facilitates the deformation capacity. Increasing the alloyage of superalloys, including rhenium, leads to formation of a necklace structure instead of a homogeneous fine-grained structure for less alloyed superalloys at the same strain.

The effect of heat treatment on characteristics of the gamma prime phase and hardness of the nickel-based superalloy Rene®80

2019 ◽  
Vol 227 ◽  
pp. 46-55 ◽  
Author(s):  
Mohammad Mehdi Barjesteh ◽  
Seyed Mehdi Abbasi ◽  
Karim Zangeneh Madar ◽  
Kourosh Shirvani
Keyword(s):  
Heat Treatment ◽  
Gamma Prime ◽  
Nickel Based Superalloy ◽  
Prime Phase
Sign in / Sign up

Export Citation Format

Share Document