Compositional Optimization of In718 Superalloy Powder for Additive Manufacturing

2018 ◽  
Vol 941 ◽  
pp. 2167-2172
Author(s):  
Che Yi Lin ◽  
Hui Yum Bor ◽  
Chao Nan Wei ◽  
Chien Hung Liao
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Additive Manufacturing ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Gas Atomization ◽  
In718 Superalloy ◽  
Sieving Process ◽  
Superalloy Powder ◽  
Metal Droplets

In this research, a composition optimized In718 superalloy powder suitable for additive manufacturing has been developed by using the vacuum induction melting gas atomization (VIGA) and the powder sieving process. VIGA which combines the vacuum induction melting (VIM) and gas atomization (GA) processes uses high pressure inert gas to atomize the metal melt formed by VIM to form metal droplets. These metal droplets are solidified to form metal powders during the falling process in the atomized chamber. After the sieving process, the mean particle size D50 of the powder is less than 35 μm and the particle size distribution (PSD) ranges from 10 to 55 μm (D10~D90). Besides, the produced powder has high flowability (ICarr ≦15), which is suitable for selective laser melting (SLM) additive manufacturing (AM). After the SLM process, the tensile tests are conducted at room temperature and high temperature of 650°C. The results show that the high temperature properties of the optimized In718 superalloy are superior to the commercial In718 superalloy.

VASCOMAX T-300

Alloy Digest ◽  
1990 ◽  
Vol 39 (12) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
High Temperature ◽  
Heat Treating ◽  
Vacuum Arc ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Vacuum Arc Remelting ◽  
Temperature Performance

Abstract VASCOMAX T-300 is an 18% nickel maraging steel in which titanium is the primary strengthening agent. It develops a tensile strength of about 300,000 psi with simple heat treatment. The alloy is produced by Vacuum Induction Melting/Vacuum Arc Remelting. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-454. Producer or source: Teledyne Vasco.

Influences of Solution Temperatures on Microstructure and Mechanical Properties of near α Titanium Alloy

2021 ◽  
Vol 1035 ◽  
pp. 89-95
Author(s):  
Chao Tan ◽  
Zi Yong Chen ◽  
Zhi Lei Xiang ◽  
Xiao Zhao Ma ◽  
Zi An Yang
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
High Temperature ◽  
Room Temperature ◽  
Solution Temperature ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Β Phase ◽  
Α Phase ◽  
New Type

A new type of Ti-Al-Sn-Zr-Mo-Si series high temperature titanium alloy was prepared by a water-cooled copper crucible vacuum induction melting method, and its phase transition point was determined by differential thermal analysis to be Tβ = 1017 °C. The influences of solution temperature on the microstructures and mechanical properties of the as-forged high temperature titanium alloy were studied. XRD results illustrated that the phase composition of the alloy after different heat treatments was mainly α phase and β phase. The microstructures showed that with the increase of the solution temperature, the content of the primary α phase gradually reduced, the β transformation structure increased by degrees, then, the number and size of secondary α phase increased obviously. The tensile results at room temperature (RT) illustrated that as the solution temperature increased, the strength of the alloy gradually increased, and the plasticity decreased slightly. The results of tensile test at 650 °C illustrated that the strength of the alloy enhanced with the increase of solution temperature, the plasticity decreased first and then increased, when the solution temperature increased to 1000 °C, the alloy had the best comprehensive mechanical properties, the tensile strength reached 714.01 MPa and the elongation was 8.48 %. Based on the room temperature and high temperature properties of the alloy, the best heat treatment process is finally determined as: 1000 °C/1 h/AC+650 °C/6 h/AC.

Microstructure and Hardness of High Temperature Alloy Ti-1100 Melted in CaO Crucible

2014 ◽  
Vol 788 ◽  
pp. 158-163
Author(s):  
Bin Guo Fu ◽  
Hong Wei Wang ◽  
Chun Ming Zou ◽  
Pan Ma ◽  
Zun Jie Wei
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Thin Layer ◽  
Vickers Hardness ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
High Temperature Alloy ◽  
Melting Technology ◽  
Cast Alloys

A high temperature alloy Ti-1100 was produced by vacuum induction melting technology. The effects of casting modulus on the microstructure and hardness of the cast alloys were determined and the results were presented and briefly discussed. Results demonstrate that the microstructure of cast alloys with different modulus are all widmanstatten structure with basket weave features where individual α-laths are separated by a thin layer of retained prior β phase. The greater the modulus, the larger the prior β grain size and α-laths spacing, and the less the Vickers hardness. The roles of the casting modulus governing the microstructures and hardness of the alloys were also discussed.

NICKELVAC X-750

Alloy Digest ◽  
1990 ◽  
Vol 39 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Rupture Strength ◽  
Heat Treating ◽  
Vacuum Arc ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Creep Rupture Strength ◽  
Temperature Performance ◽  
Oxidation And Corrosion

Abstract NICKEL VAC X-750 is a precipitation hardenable nickel-alloy with high creep-rupture strength up to 1500 F(816 C) and excellent oxidation and corrosion resistance up to 1800 F(982 C). It is produced by vacuum induction melting followed by either vacuum arc or electroslag remelting. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-386. Producer or source: Teledyne Allvac.

CARPENTER VIM-VAR M-50 BEARING STEEL

Alloy Digest ◽  
1991 ◽  
Vol 40 (7) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Bearing Steel ◽  
Vacuum Arc ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Vacuum Arc Remelting ◽  
Temperature Performance ◽  
High Degree

Abstract CARPENTER VIM-VAR M-50 Bearing Steel is produced by vacuum induction melting and vacuum arc remelting. The alloy's high degree of cleanliness enables it to be finished to a high luster. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming and heat treating. Filing Code: TS-360. Producer or source: Carpenter. Originally published as Carpenter M-50, April 1980, revised July 1991.

scholarly journals Size-Dependent Structural Properties of a High-Nb TiAl Alloy Powder

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 161 ◽  
Author(s):  
Binglin Liu ◽  
Maosong Wang ◽  
Yulei Du ◽  
Jingxiao Li
Keyword(s):  
Particle Size ◽  
High Temperature ◽  
Structural Properties ◽  
Structural Changes ◽  
Structural Characteristics ◽  
Nominal Composition ◽  
Induction Melting ◽  
Powder Size ◽  
Size Dependent ◽  
High Temperature Xrd

TiAl-based alloys are promising light weight structural materials for high temperature applications in the field of aerospace. Recently, fabrication technologies starting from powders including powder metallurgy and additive manufacturing have been developed to overcome the difficulties in the processing, machining and shaping of TiAl-based alloys. Spherical alloy powders with different particle size distributions are usually used in these fabrication techniques. The purpose of this study is to reveal the size-dependent structural properties of a high-Nb TiAl powder for these fabrication technologies starting from powders. A high-Nb TiAl pre-alloyed powder with nominal composition of Ti-48Al-2Cr-8Nb (at. %) was prepared by the electrode induction melting gas atomization (EIGA) method. The phase structure and morphology of the as-atomized powders were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The size-dependent structural changes of the as-atomized powders with different sizes were studied by differential scanning calorimetry (DSC) and in situ high temperature XRD. It was found that with decreasing the powder size, the content of the γ-TiAl phase decreases and the α2-Ti3Al phase increases. The α2-Ti3Al to γ-TiAl phase transformation was found in the temperature range of 600–770 °C. Based on the present work, the structural characteristics of TiAl powders are strongly dependent on their particle size, which should be considered in optimizing the process parameters of TiAl alloys fabricated from powders.

Oxide Dispersion in Direct-Cast Gamma TiAl-Based Alloy

1994 ◽  
Vol 364 ◽  
Author(s):  
Toshihiro Hanamura ◽  
Keizo Hashimoto
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
High Frequency ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Oxide Dispersion ◽  
Dispersion Strengthening ◽  
Alumina Particles ◽  
High Temperature Tensile ◽  
High Frequency Induction

AbstractThe objective of this study is to evaluate the high temperature behavior of γ TiAl-based alloy sheets containing AI2O3 particles, produced by a combination of vacuum induction melting, use of a CaO crucible, and direct sheet casting, over a wide temperature range. Alumina particles, having a tendency to coagulate during solidification of a TiAl ingot, are finely dispersed due to the disturbance of high frequency induction, and frozen without having enough time to grow in size by direct sheet casting. The TiAl sheet thus produced shows remarkable high temperature tensile strength which exceeds that of conventional ingots having the same composition and various different structures. This is determined to be attributable to the dispersion strengthening of finely dispersed AI2O3 particles whose diameter is from 100 to 500nm. Moreover, because of the small size of these alumina particles, the TiAl sheet does not show any significant retardation in high temperature ductility, which is often the case in conventional ceramic-reinforced intermetallic compound composites.

A Novel Process for Making Spherical Powders of High Nb Containing TiAl Alloys

2012 ◽  
Vol 520 ◽  
pp. 111-119 ◽  
Author(s):  
Xin Lu ◽  
L.P. Zhu ◽  
Xuan Hui Qu
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Fluidized Bed ◽  
Argon Plasma ◽  
Average Diameter ◽  
Processing Parameters ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Distribution Uniformity ◽  
Jet Milling

A novel process was developed to make micro-fine spherical high Nb containing TiAl alloyed powders in quantity. Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y(at%) ingot prepared by vacuum induction melting was heat-treated for homogenization, and then machined with a crusher. The chippings were refined by fluidized bed jet milling, and subsequently spheroidized with radio frequency (RF) argon plasma. The effects of processing parameters on powder characteristics were studied. By fluidized bed jet milling, the particle size and distribution uniformity both decline with the rise of classifier frequency. Above 5800rpm, the number-average diameter is lower than 20μm with a bimodal particle size distribution. The powders consist of coarse plate-shaped particles and some finer flaky debris, and with the further rise of the frequency, the amount of debris gradually increases. The plasma-spheroidized powders are found to possess good sphericity and composition homogeneity with phase dominated by supersaturated α2-Ti3Al. The granulometric characteristics of the spherical powders strongly depend on those of the feed powders. For the jet milled powders below 5800rpm, due to the relatively lower size distribution uniformity, the fine particle fraction reduces after spheroidization, which causes an obvious improvement of distribution uniformity and the corresponding increase of number-average diameter

Sign in / Sign up

Export Citation Format

Share Document