Comparison of Rapidly Solidified Nickel Base Superalloys Prepared by Melt Spinning and Plasma Deposition

1983 ◽  
Vol 28 ◽  
Author(s):  
A.I. Taub ◽  
M.R. Jackson ◽  
S.C. Huang ◽  
E.L. Hall
Keyword(s):  
Tensile Testing ◽  
Melt Spinning ◽  
Plasma Deposition ◽  
Nickel Base Superalloy ◽  
Petch Relation ◽  
Melt Spun ◽  
Nickel Base Superalloys ◽  
Nickel Base ◽  
Rapidly Solidified ◽  
Base Superalloy

ABSTRACTThe microstructure and yield strength of two nickel base superalloys prepared by melt spinning and plasma deposition are compared in the as-solidified condition and after annealing. The results support the interpretation of the yield strengths obtained by tensile testing melt spun ribbon as representative of the values obtained for bulk specimens with equivalent microstructures. The effectiveness of grain size strengthening in a nickel base superalloy is also examined. The Hall-Petch relation appears to be obeyed, with a slope k = .77±.15 MPa−m1/2.

Rapidly solidified MC carbide morphologies of a laser-glazed single-crystal nickel-base superalloy

1992 ◽  
Vol 156 (1) ◽  
pp. 109-116 ◽  
Author(s):  
H.M. Wang ◽  
J.H. Zhang ◽  
Y.J. Tang ◽  
Z.Q. Hu ◽  
N. Yukawa ◽  
...  
Keyword(s):  
Single Crystal ◽  
Nickel Base Superalloy ◽  
Nickel Base ◽  
Rapidly Solidified ◽  
Base Superalloy

Effect of Al Addition in Cast Nickel Base Superalloys, Inconel-738 on Microstructures and Oxidation Behaviors at 900°C and 1000°C

2015 ◽  
Vol 656-657 ◽  
pp. 39-44 ◽  
Author(s):  
Panyawat Wangyao ◽  
Sureerat Polsilapa ◽  
Aimamorn Promboopha ◽  
Pajaree Srigiofun ◽  
Ornin Srihakulung
Keyword(s):  
Elevated Temperatures ◽  
Research Work ◽  
Intermetallic Phase ◽  
Vacuum Arc ◽  
Nickel Base Superalloy ◽  
Protective Oxide ◽  
Al Addition ◽  
Nickel Base Superalloys ◽  
Nickel Base ◽  
Base Superalloy

The objective of this research work is to investigate the effect of Aluminum addition in cast nickel base superalloy grade Inconel-738 by vacuum arc melting process on microstructural modification and oxidation behavior at elevated temperatures of 900°C and 1000°C. The Al element, basically, could be added in cast nickel base superalloys in proper amount to form precipitated intermetallic phase with nickel atoms as gamma prime phase (γ’, Ni3Al) to increase mechanical properties by blocking dislocation movements at elevated temperatures. Furthermore, Al can assist nickel base superalloy to form protective oxide film, Al2O3 for better oxidation resistance at very high temperatures (over 980°C). In this research, all casted samples of Inconel-738 with various Al additions for 1, 2 and 3 percent by weight were standard heat treated consisting of solution treating at 1125°C for 6 hours and following with precipitate aging at 845°C for 24 hours. The oxidation tests were carried out at temperatures of 900°C and 1000°C up to 110 hours. From all obtained results, it was found that the sample that has the most microstructural stability after long-term heating as simulated working conditions is Inconel-738 sample with 2%wt. Al addition. Furthermore, more Al addition had resulted in higher oxidation resistances for both testing temperatures.

Process and structural aspects of melt-spun nickel-base superalloy ribbons

1983 ◽  
Vol 14 (9) ◽  
pp. 1817-1823 ◽  
Author(s):  
H. H. Liebermann ◽  
R. E. Maxwell ◽  
R. W. Smashey ◽  
J. L. Walter
Keyword(s):  
Nickel Base Superalloy ◽  
Melt Spun ◽  
Nickel Base ◽  
Structural Aspects ◽  
Base Superalloy

Dependence of Intergranular Fracture on Boundary Topography and Cohesion

1973 ◽  
Vol 31 ◽  
pp. 150-151
Author(s):  
J. E. Doherty ◽  
A. F. Giamei ◽  
B. H. Kear ◽  
C. W. Steinke
Keyword(s):  
Grain Boundary ◽  
Room Temperature ◽  
Nickel Base Superalloy ◽  
Boundary Shear ◽  
Room Temperature Ductility ◽  
Solid Solution Matrix ◽  
Nickel Base ◽  
Solution Matrix ◽  
Different Levels ◽  
Base Superalloy

Recently we have been investigating a class of nickel-base superalloys which possess substantial room temperature ductility. This improvement in ductility is directly related to improvements in grain boundary strength due to increased boundary cohesion through control of detrimental impurities and improved boundary shear strength by controlled grain boundary micros true tures.For these investigations an experimental nickel-base superalloy was doped with different levels of sulphur impurity. The micros tructure after a heat treatment of 1360°C for 2 hr, 1200°C for 16 hr consists of coherent precipitates of γ’ Ni3(Al,X) in a nickel solid solution matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

Rapidly Solidified Melt-spun Bi-Sn Ribbons: Surface Composition Issues

2016 ◽  
pp. 3287-3297
Author(s):  
Tarek El Ashram ◽  
Ana P. Carapeto ◽  
Ana M. Botelho do Rego
Keyword(s):  
Chemical Composition ◽  
Optical Microscopy ◽  
Melt Spinning ◽  
Surface Composition ◽  
Electrochemical Process ◽  
Melt Spun ◽  
Bismuth Alloy ◽  
The One ◽  
Rapidly Solidified ◽  
Melt Spinning Technique

Tin-bismuth alloy ribbons were produced using melt-spinning technique. The two main surfaces (in contact with the rotating wheel and exposed to the air) were characterized with Optical Microscopy and AFM, revealing that the surface exposed to the air is duller (due to a long-range heterogeneity) than the opposite surface. Also the XPS chemical composition revealed many differences between them both on the corrosion extension and on the total relative amounts of tin and bismuth. For instance, for the specific case of an alloy with a composition Bi-4 wt % Sn, the XPS atomic ratios Sn/Bi are 1.1 and 3.7 for the surface in contact with the rotating wheel and for the one exposed to air, respectively, showing, additionally, that a large segregation of tin at the surface exists (nominal ratio should be 0.073). This segregation was interpreted as the result of the electrochemical process yielding the corrosion products.

Sign in / Sign up

Export Citation Format

Share Document