Alloying Element Nb Effect on Microstructure of Co-Al-W Superalloy by Vacuum Arc Melting

2012 ◽  
Vol 229-231 ◽  
pp. 63-67
Author(s):  
Yang Tao Xu ◽  
Tian Dong Xia ◽  
Wen Jun Zhao ◽  
Xiao Jun Wang
Keyword(s):  
Hardness Test ◽  
Melting Process ◽  
Xrd Analysis ◽  
Vacuum Arc ◽  
Rockwell Hardness ◽  
Pure Element ◽  
Alloying Element ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
L12 Structure

Co-Al-W supperalloy used pure element powder, according to the ratio of different atomic percentage composition to make ingredients. It is mixed by planetary ball mill, pressed into blocks after the melting shape. Vacuum arc melting process was prepared by melting, after grinding, polishing, and after a volume of 5% perchloric acid and 95% of the electrolytic etcheing solution prepared in ethanol corrosion observed after analysis of the microstructure and phase composition by XRD analysis .It can be found that Co-Al-W superalloys were mainly composed of cobalt-rich matrix of austenite precipitation of γ phase and coherent with matrix of the L12 structure of γ′-Co3(Al,W) phase. In addition, Nb have effect on grain refinement and refine grain. Rockwell hardness test and analysis, It can be found that Nb can clearly improve the Co-Al-W superalloy hardness.

Study on Homogenization Time and Cooling Rate on Microstructure and Hardness of Ni-42.5wt%Ti-3wt%Cu Alloy

2010 ◽  
Vol 297-301 ◽  
pp. 489-494 ◽  
Author(s):  
A. Etaati ◽  
Ali Shokuhfar ◽  
E. Omrani ◽  
P. Movahed ◽  
H. Bolvardi ◽  
...  
Keyword(s):  
Cooling Rate ◽  
Hardness Test ◽  
Vacuum Arc ◽  
Melting Method ◽  
X Ray ◽  
Cu Alloy ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Homogenization Time ◽  
Cooling Media

Over the last decades, numerous investigations have been conducted on Nitinol properties. However, the effects of alloying elements on Ni-rich NiTi alloys have been considered less. In this research, different effects of homogenization time and cooling rate on the behaviors of Ni-42.5wt%Ti-3wt%Cu alloy were evaluated. The mentioned alloy was fabricated by vacuum arc melting method. Three different homogenization times (half, one and two hours) and three cooling media (water, air and furnace) were selected. The microstructure and hardness were examined by means of optical and scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) analysis and hardness test, respectively. According to the microscopic investigations, no significant changes were observed after half an hour. However, results indicate that increasing time of homogenization leads to finer precipitations and a uniform distribution of them. The various cooling environments result in the formation of two types of precipitation phases. It was seen that in the high cooling rate, the majority of precipitations consisted of Ti2(Ni,Cu) while by decreasing cooling rate NiTiCu precipitates appeared too, which affect the hardness.

A Study of Quaternary Cr-Cr2Ta Alloys - Microstructure and Mechanical Properties

2013 ◽  
Vol 1516 ◽  
pp. 275-281 ◽  
Author(s):  
Varun Choda ◽  
Ayan Bhowmik ◽  
Ian M. Edmonds ◽  
C. Neil Jones ◽  
Howard J. Stone
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Eutectic Mixture ◽  
Melting Process ◽  
Laves Phase ◽  
Vacuum Arc ◽  
Micro Scale ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Atomic Radii

ABSTRACTSix alloys based on Cr-10Ta-7Si (by at.%) with quaternary additions of 0.5Ag, 5Ti, 1Hf, 3Mo, 3Al, or 3Re (by at.%) substituted for Cr were produced by vacuum arc-melting. The microstructures of the alloys were found to predominantly consist of a eutectic mixture of an A2 Cr-based solid solution and a C14 Cr2Ta Laves phase along with proeutectic Cr2Ta dendrites. Microstructural macro- and micro-scale inhomogeneities were observed in all alloy ingots, which were attributed to the non-equilibrium arc-melting process. The measured lattice parameters of the constituent phases and the elemental partitioning behaviour between the phases have been correlated with the respective covalent atomic radii. The bulk hardnesses of the alloys, along with the hardness of individual phases, have also been reported.

New Nickel Based Superalloys Development by Vacuum Arc Melting Process Based on Aluminum Addition of GTD-111

2014 ◽  
Vol 1025-1026 ◽  
pp. 455-460 ◽  
Author(s):  
Sureerat Polsilapa ◽  
Panyawat Wangyao ◽  
Pichayakit Boonpou ◽  
Aimamon Promboobpa ◽  
Suvanchai Pongsugitwat
Keyword(s):  
Melting Process ◽  
Vacuum Arc ◽  
Nickel Base Superalloy ◽  
Hardness Tester ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Reheat Treatment ◽  
Al Addition ◽  
Nickel Base ◽  
Al Additions

This research objective is to study the microstructural modification by Al additions in cast nickel base superalloy, GTD-111 by means of vacuum arc melting process. The Al additions to the alloy were 1, 2 and 3% by weight. After that, all casted specimens were performed with different reheat treatment conditions, which consist of solutioning temperatures of 1125°C, 1145°C, 1165°C, 1185°C and 1205°C, respectively, for 6 hours following with precipitation aging at 845°C for 24 hours. After all reheat treatments, the microstructures were investigated and analyzed by SEM. From all obtained results, it was founded that the specimens with Al additions for 1-2%wt. following with reheat treatment show the decrease in size of γ’ precipitated particles when increasing solutioning temperatures. 3%wt. of Al addition was too high content resulting in already improper microstructural characteristics. However all obtained data of area fractions of precipitate phase were almost the same. Effect of Al addition and solutioning temperature did not provide any significant effect in this case. The mechanical property behavior: hardness was investigated by using Vickers hardness tester. It was found that the hardness all was very similar and increased with higher solutioning temperatures.

Effects of Al Additions and Reheat Treatments on Microstructures of Modified Nickel-Based Superalloy, Grade Inconel 738, by Vacuum Arc Melting Process

2014 ◽  
Vol 1025-1026 ◽  
pp. 395-402 ◽  
Author(s):  
Panyawat Wangyao ◽  
Peerada Jariyasakuntham ◽  
Sureerat Polsilapa ◽  
Aimamon Promboobpa ◽  
Suvanchai Pongsugitwat
Keyword(s):  
Melting Process ◽  
Area Fraction ◽  
Vacuum Arc ◽  
Nickel Based Superalloy ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Treatment Conditions ◽  
Al Addition ◽  
Al Additions ◽  
Solutioning Temperature

This research has an aim to modify and improve the microstructures and hardness property of cast nickel-based superalloy, IN-738 by modified chemical composition of various Al additions as well as different reheat treatment conditions. IN-738 was modified by adding aluminium in 1, 2 and 3% by weight and casting with vacuum arc melting process. Then all casted alloys were performed with 5 different solutioning temperatures of 1125°C, 1145°C, 1165°C, 1185°C and 1205°C for 6 hours and all following with the same precipitation aging temperature of 845°C for 24 hours. The various obtained microstructures of the casting and reheat treatments were observed and investigated by SEM to evaluate the average area fraction and size of γ’ precipitated particles. The mechanical property was evaluated by Vickers hardness. From the obtained results, it was found that fine microstructure, which would be the most appropriate for using at elevated temperature, was obtained by the Al addition with 1%wt. following with solutioning temperature range between 1125°C – 1145°C/6 hours and precipitation aging at 845°C/24 hours. The microstructures received consist of high area fraction of γ’ particles in cubic shape with the proper size. However, the maximum hardness value of 683 HV was obtained from the alloy with 3%wt. Al addition following with solutioning temperature of 1205°C.

New alloy development from modified cast Ni-base superalloy GTD-111 with additions of Al, Ni and/or Co prepared by vacuum arc melting process

2020 ◽  
Vol 62 (7) ◽  
pp. 665-671
Author(s):  
Napat Kiatwisarnkij ◽  
Panyawat Wangyao ◽  
Tanaporn Rojhirunsakool ◽  
Gobboon Lothongkum
Keyword(s):  
Melting Process ◽  
Vacuum Arc ◽  
Alloy Development ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Base Superalloy

Study on Microstructure and Phase Composition of Co-8.8Al-9.8W Superalloy with Alloying Element Tantalum

2015 ◽  
Vol 1083 ◽  
pp. 37-39
Author(s):  
Yang Tao Xu ◽  
Qi Zhen Sha ◽  
Wan Li Zhao
Keyword(s):  
Phase Composition ◽  
Ball Mill ◽  
Melting Process ◽  
Xrd Analysis ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Pure Element ◽  
Alloying Element ◽  
Etching Solution ◽  
Electrolytic Etching

In order to study the effect of tantalum to the microstructure and phase composition of Co-8.8Al-9.8W-XTa (X=0,2,at%) superalloy. The Co-8.8Al-9.8W-XTa (X=0,2) supperalloy used pure element powder, according to the ratio of different atomic percentage composition to make ingredients. It is mixed by planetary ball mill, pressed into blocks after the melting shape. Vacuum induction melting process was prepared by melting, after grinding, polishing, and after a volume of 5% perchloric acid and 95% of the electrolytic etching solution prepared in ethanol corrosion observed after analysis of the microstructure and phase composition by OM and XRD analysis. It can be found that the 9.8W and 2Ta alloy were mainly composed of rich γ-Co matrix of austenite precipitation of γ phase and coherent with matrix of the L12 structure of γ′-Co3(Al,W) phase. In addition, Ta element has effect on grain refinement and the number of γ′-Co3(Al,W) phase refines grain.

Alloying Element Ta Effect on Microstructure of Co-Al-W Superalloy by Vacuum Arc Melting

2013 ◽  
Vol 718-720 ◽  
pp. 10-13
Author(s):  
Wen Jun Zhao ◽  
Yang Tao Xu
Keyword(s):  
High Temperature ◽  
High Strength ◽  
Vacuum Arc ◽  
High Temperature Strength ◽  
The Novel ◽  
Alloying Element ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Before And After ◽  
Nickel Base

Co-based high temperature alloys have been widely used in aeronautics and astronautics industry, because of its high strength at high temperature, excellent resistance of hot corrosion and oxidation. Unlike the traditional Co-based superalloys, strengthened by solution and carbide strengthening, the novel Co-Al-W superalloys are strengthened by a ternary compound with the Ll2 structure γ-Co3(Al,W). And the novel Co-Al-W superalloys showing high-temperature strength greater than those of conventional nickel-base superalloys, will become the candidates for next-generation high-temperature materials. We research alloying element Ta effect on microstructure of Co-Al-W superalloys by vacuum arc melting. Compare with the microstructure before and after adding alloying element Ta of Co-Al-W superalloy, we find that most of Ta element distributed in the γ-Co substrate phase, stabilizing and reinforcement the γ phase.

Effect of Si Content on Microstructure and Wear Resistance of Cold Roll Steel with 5%Cr

2011 ◽  
Vol 189-193 ◽  
pp. 4281-4285 ◽  
Author(s):  
Ying Mai Wu ◽  
Yi Tao Yang ◽  
Guang Jie Shao
Keyword(s):  
Wear Resistance ◽  
Melting Furnace ◽  
Xrd Analysis ◽  
Vacuum Arc ◽  
Primary Carbide ◽  
Roll Steel ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Cold Roll ◽  
Si Content

The effect of Si content on structure and wear resistance of cold roll steel with 5%Cr by using vacuum arc melting furnace had been studied in this paper. Results showed that with increasing Si content martensite got coarsening and the number and content of primary carbide increased; The type of primary carbide was M7C3 and Si mainly dissolved into martensite by XRD analysis; The wear resistance was effectively improved while Si content increased. The appropriate Si content in cold roll steel with 5%Cr was 1.5%~2％.

Effects of Aluminum Addition on Microstructural Characteristics in Modified Coated Nickel-Based Superalloy, GTD-111, by Arc Melting

2015 ◽  
Vol 1101 ◽  
pp. 129-133
Author(s):  
Panyawat Wangyao ◽  
Arisa Meechoorit ◽  
Pattarin Pattaraumpornchai ◽  
Seksak Asavavisithchai
Keyword(s):  
Elevated Temperatures ◽  
Solution Treatment ◽  
Melting Process ◽  
Vacuum Arc ◽  
Microstructural Stability ◽  
Aluminum Addition ◽  
Nickel Based Superalloy ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
High Area

The nickel-based superalloys, grade GTD-111, were modified by aluminum addition by the mean of vacuum arc melting process, in order to improve microstructure and oxidation resistance at elevated temperatures. The arc melted GTD-111 specimens were added with aluminum of 1, 2 and 3 wt. %. All specimens were then performed with heat treatment, which consists of solution treatment for 6 h at various temperatures of 1125, 1145, 1165, 1185 and 1205°C. After that, all specimens were followed by precipitation aging at 845°C for 24 h. Finally, to evaluate the microstructural stability, the long-term heating at temperatures of 900 and 1000°C for 400 h were performed to the specimens. It was found that the most proper amount of aluminum addition was 1 wt.%, which provided reheat treated microstructures with high area fractions of γ′-precipitated particles, as well as uniformed distribution of cubic γ′-morphology. The most proper solutioning condition is also found at 1165°C for 6 h.

scholarly journals Irradiation Behaviors in BCC Multi-Component Alloys with Different Lattice Distortions

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 706
Author(s):  
Yue Su ◽  
Songqin Xia ◽  
Jia Huang ◽  
Qingyuan Liu ◽  
Haocheng Liu ◽  
...  
Keyword(s):  
Single Phase ◽  
Vacuum Arc ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Chemical Complexity ◽  
Arc Melting ◽  
Vacuum Arc Melting ◽  
Lattice Distortions ◽  
Face Centered ◽  
Displacement Per Atom

Recently, the irradiation behaviors of multi-component alloys have stimulated an increasing interest due to their ability to suppress the growth of irradiation defects, though the mostly studied alloys are limited to face centered cubic (fcc) structured multi-component alloys. In this work, two single-phase body centered cubic (bcc) structured multi-component alloys (CrFeV, AlCrFeV) with different lattice distortions were prepared by vacuum arc melting, and the reference of α-Fe was also prepared. After 6 MeV Au ions irradiation to over 100 dpa (displacement per atom) at 500 °C, the bcc structured CrFeV and AlCrFeV exhibited significantly improved irradiation swelling resistance compared to α-Fe, especially AlCrFeV. The AlCrFeV alloy possesses superior swelling resistance, showing no voids compared to α-Fe and CrFeV alloy, and scarce irradiation softening appears in AlCrFeV. Owing to their chemical complexity, it is believed that the multi-component alloys under irradiation have more defect recombination and less damage accumulation. Accordingly, we discuss the origin of irradiation resistance and the Al effect in the studied bcc structured multi-component alloys.

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