Effect of Ta on the Oxidation Resistance of a Cast Nickel-Base Die Material with Low Cr and High W Content

2005 ◽  
Vol 475-479 ◽  
pp. 669-672
Author(s):  
Qing Li ◽  
Cheng Bo Xiao ◽  
Jin Xia Song ◽  
Ding Gang Wang ◽  
Ya Fang Han
Keyword(s):  
Oxidation Resistance ◽  
Protective Layer ◽  
Mass Gain ◽  
Nickel Base Superalloy ◽  
Temperature Oxidation ◽  
Isothermal Forging ◽  
Oxidation Test ◽  
Die Material ◽  
Nickel Base ◽  
Forging Die

A conventional cast nickel-base superalloy with the chemical composition of Ni-16W-2Mo-1.5Cr-6Al wt % has been recently developed as isothermal forging die material operating at temperatures above 1000°C. The oxidation test results showed that the oxide scale spalled heavily after exposure in air at 1050°C for 100 h, which is unacceptable for the process of isothermal forging. To improve the high temperature oxidation resistance, 3 wt% Ta was added into the alloy. Specimens after oxidation test were analyzed by the scanning electron microscope (SEM) and the X-ray diffraction analysis (XRD). The results showed that the oxides were mainly NiO, NiWO4, and NiAl2O4 for all the samples. The oxidation resistance of the alloy with 3wt%Ta was fairly good at 1050°C with the mass gain rate of around 0.016g/m2•h and spallation of oxides less than 2g/m2 within 100h.The SEM results showed that a continuous protective layer of Al2O3 has been formed under the layer of NiO for the alloy containing Ta.

The Effect of Ultrasonic Treatment on the Oxidation Resistance and Microstructure of Fe80Cr20 Alloy Powder at High Temperature Oxidation Process

2015 ◽  
Vol 1087 ◽  
pp. 126-130
Author(s):  
Dafit Feriyanto ◽  
Maizlinda Izwana Idris ◽  
Darwin Sebayang
Keyword(s):  
Surface Morphology ◽  
Oxidation Resistance ◽  
Ultrasonic Treatment ◽  
Alloy Powder ◽  
Parabolic Rate Constant ◽  
Mass Gain ◽  
Raw Material ◽  
Ultrasonic Technique ◽  
Temperature Oxidation ◽  
Oxidation Test

Effect of ultrasonic treatment on the oxidation kinetics and microstructure of Fe80Cr20alloy is investigated. The aim of this study is to improve the surface morphology and oxidation resistance of the Fe80Cr20alloy powder as a raw material. Ultrasonic technique is very promise technology and not yet fully explored. The Fe80Cr20material was treated by ultrasonic technique (UT) at various times of 3.5 h, 4.5 h, 5 h and followed by cold compaction with force of 13 Newton. The oxidation test was carried out using tube furnace under argon gas environment with 5 cycles, which has been considered. It was found that the UT has improved the surface morphology of the material effectively. Ultrasonic was revealed that the good interparticle bonding when experimented with ultrasonic treatment at 4.5 h. In the oxidation test, the lowest mass gain of 68 mg/cm2was found at the oxidation time of 100 h. Meanwhile, the lowest parabolic rate constant of 6.8198 x 10-14g2cm-4s-1was revealed when ultrasonic for 4.5 h sample.

OXIDATION RESISTANCE OF LOW-TEMPERATURE PACK ALUMINIZING COATINGS ON NI-BASE SUPERALLOY

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3185-3189 ◽  
Author(s):  
BIFEI YUAN ◽  
LONGWEN YU ◽  
GUIWU LU
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Aluminide Coating ◽  
Nickel Base Superalloy ◽  
Temperature Oxidation ◽  
Pack Aluminizing ◽  
Nickel Base ◽  
Base Superalloy

A nickel-base superalloy has been used to deposit the aluminide coating by low-temperature pack cementation process. The high temperature oxidation tests on aluminized alloys and the uncoated specimens are carried out at 1000°C for 10h. It is observed that a dense and protective Al 2 O 3 surface layer is produced on the aluminized alloy, and the aluminizing process has greatly enhanced the high temperature oxidation resistance of the Ni -base superalloy at 1000°C. As a contrast, the uncoated specimen begins to be failure when treated only for 6h at the same temperature.

ENHANCING HIGH-TEMPERATURE OXIDATION RESISTANCE OF TITANIUM ALLOY WITH KF110-B4C-Ag THROUGH LASER TECHNOLOGY

2021 ◽  
Author(s):  
ZHAO ZHANG ◽  
JIANING LI ◽  
ZHIYUN YE ◽  
CAINIAN JING ◽  
MENG WANG ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Mass Gain ◽  
Temperature Oxidation ◽  
Laser Technology ◽  
X Ray ◽  
Ta15 Titanium Alloy ◽  
Oxidation Resistant

In this paper, the high-temperature oxidation resistant coating on the TA15 titanium alloy by laser cladding (LC) of the KF110-B4C-Ag mixed powders was analyzed in detail. The scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDS) images indicated that a good metallurgy bond between the fabricated coating/TA15 was formed; also the fine/compact microstructure was produced after a cladding process. The oxidation mass gain of TA15 was higher than that of the coating after LC process, which were 3.72 and 0.91[Formula: see text]mg[Formula: see text]cm[Formula: see text], respectively, at 60[Formula: see text]h, greatly enhancing the high temperature oxidation resistance.

scholarly journals Isothermal Forging of Nickel-Base Superalloy Modified IN-100 Disk

1989 ◽  
Vol 30 (1) ◽  
pp. 67-76 ◽  
Author(s):  
Kiyoyuki Ohuchi ◽  
Yoshinori Nakazawa ◽  
Ken-ichi Matsuno
Keyword(s):  
Nickel Base Superalloy ◽  
Isothermal Forging ◽  
Nickel Base ◽  
Base Superalloy

Oxidation Behaviour of Nickel-Based Alloys Containing High Re Contents Comparable to the Third Generation Nickel-Based Superalloys

2004 ◽  
Vol 449-452 ◽  
pp. 349-352 ◽  
Author(s):  
Yoshinori Murata ◽  
Masahiko Morinaga ◽  
Ryokichi Hashizume
Keyword(s):  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Oxidation Behaviour ◽  
The Other ◽  
Third Generation ◽  
Temperature Oxidation ◽  
Oxidation Test ◽  
Al Content ◽  
The Third

In order to elucidate the Re effect on oxidation resistance, a high-temperature oxidation test was conducted with two groups of Ni-based superalloys. One group of alloys was characterized by 10mol%Al content (10-Al series). The other group of alloys was characterized by 15mol%Al content (15-Al series). The oxidation resistance decreased clearly with increasing Re content in the 10-Al series alloys, but did not in the 15-Al series alloys.

EFFECT OF BORON CONTENT ON HIGH-TEMPERATURE OXIDATION RESISTANCE OF B-BEARING HIGH-SPEED STEEL

2020 ◽  
Vol 27 (12) ◽  
pp. 2050023
Author(s):  
YINGHUA LIN ◽  
HUI LI ◽  
JIANG JU ◽  
CHANGCHUN JIANG ◽  
YONGPING LEI ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
Oxidation Resistance ◽  
Retained Austenite ◽  
High Speed ◽  
Boron Content ◽  
Unit Area ◽  
High Speed Steel ◽  
Mass Gain ◽  
Temperature Oxidation

The oxidation behavior of B-bearing high-speed steel was studied at 923[Formula: see text]K. The results showed that the as-cast microstructure of 1.0 wt.%B high-speed steel was composed of pearlite + ferrite + M7(C, B)3 + M2(B, C). When the boron content increased, the microstructure gradually changed into martensite + retained austenite + netlike M2(B, C) + M[Formula: see text](C, B)6 + M7(C, B)3. The cyclic oxidation of B-bearing high-speed steel at K followed parabolic rule. The unit area mass gain of 1 wt.%B high-speed steel was 4.2 g/m2 after 923 K/250 h oxidation, and the unit area mass gain of 3 wt.%B high-speed steel was only 3.5 g/m2. The oxidation of boron element formed B2O3, which was mainly enriched at the interface of the oxide film/matrix. B2O3 flowed in the oxide film at high temperature and was easy to fill the defect. B2O3 was easy to form B2O3-SiO2 borosilicate with SiO2. The more boron content was, the more favorable it was to form B2O3-SiO2 borosilicate oxide layer rich in B2O3 and the more favorable it was to spread in the oxide film, so that the oxidation resistance of B-bearing high-speed steel could be remarkably improved.

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