Enhancing the strength of AlCrFeNi HEAs via tailoring Aluminum content and optimal aging treatment

2021 ◽  
pp. 162242
Author(s):  
Mingze Wang ◽  
Zhiqin Wen ◽  
Bo Ma ◽  
Junxiao Liu ◽  
Zhengguang Zou ◽  
...  
Keyword(s):  
Aluminum Content ◽  
Aging Treatment ◽  
Optimal Aging

Intragranular and Grain Boundary Precipitations with Aging Treatment in Mg-Al System Alloys Poured into Gravity Mold

2012 ◽  
Vol 706-709 ◽  
pp. 1140-1145
Author(s):  
Mitsuaki Furui ◽  
Susumu Ikeno ◽  
Seiji Saikawa
Keyword(s):  
Aluminum Content ◽  
Aging Treatment ◽  
Hardness Measurement ◽  
Age Hardening ◽  
Precipitation Reaction ◽  
Az91 Magnesium Alloy ◽  
Continuous Precipitation ◽  
Microstructure Observation ◽  
Transmission Electron ◽  
Az91 Magnesium

It is well-known that age hardening occurs in Mg-Al system alloys, when the alloy containing aluminum exceeds 6mass%. This precipitation reaction depends on aluminum content and aging temperature. The aging behavior in AZ91 magnesium alloy was investigated and it is the subject of this paper. However, for the Mg-Al system alloys, the influence of aluminum content on aging hardening characteristics has not been researched in detail so far. In this study, continuous and discontinuous precipitations during aging in Mg-Al system alloys cast into sand and iron molds were investigated by means of hardness measurement and microstructure observation with optical microscopy and transmission electron microscopy. Variation of hardness with aging was found to be caused mainly by the discontinuous precipitation along the grain boundaries from the composite rule in hardness. In iron mold castings, It was found that the variation of hardness with aging was found to be caused mainly by the continuous precipitation inside the crystal grain.

Microstructure of resistance spot welding of maraging steels

1990 ◽  
Vol 48 (4) ◽  
pp. 900-901
Author(s):  
I. Neuman ◽  
S.F. Dirnfeld ◽  
I. Minkoff
Keyword(s):  
Maraging Steel ◽  
Spot Welding ◽  
Lath Martensite ◽  
Base Material ◽  
Aging Treatment ◽  
High Strength ◽  
Maraging Steels ◽  
Heat Treated ◽  
Current Cycle ◽  
Welding Processes

Experimental work on the spot welding of Maraging Steels revealed a surprisingly low level of strength - both in the as welded and in aged conditions. This appeared unusual since in the welding of these materials by other welding processes (TIG,MIG) the strength level is almost that of the base material. The maraging steel C250 investigated had the composition: 18wt%Ni, 8wt%Co, 5wt%Mo and additions of Al and Ti. It has a nominal tensile strength of 250 KSI. The heat treated structure of maraging steel is lath martensite the final high strength is reached by aging treatment at 485°C for 3-4 hours. During the aging process precipitation takes place of Ni3Mo and Ni3Ti and an ordered solid solution containing Co is formed.Three types of spot welding cycles were investigated: multi-pulse current cycle, bi-pulse cycle and single pulsle cycle. TIG welded samples were also tested for comparison.The microstructure investigations were carried out by SEM and EDS as well as by fractography. For multicycle spot welded maraging C250 (without aging), the dendrites start from the fusion line towards the nugget centre with an epitaxial growth region of various widths, as seen in Figure 1.

Effect of the Loading Time for Stress Aging Treatment

1969 ◽  
Vol 18 (188) ◽  
pp. 379-384
Author(s):  
Taro UEDA ◽  
Hiroaki ARAI ◽  
Shigeru OZEKI ◽  
Koji HARATA
Keyword(s):  
Aging Treatment

NICKELVAC X-751

Alloy Digest ◽  
1990 ◽  
Vol 39 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Aluminum Content ◽  
Heat Treating ◽  
Vacuum Arc ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Service Temperature ◽  
Maximum Service Temperature

Abstract NICKEL VAC X-751 is a modification of NICKEL VAC X-750 carrying higher aluminum content (0.90-1.50 vs 0.4-1.0%). This raises the maximum service temperature 100 F(55 C) to 1600 F(871 C). NICKEL VAC X-751 has a simplified and shortened heat treating cycle relative to NICKEL VAC X-750. It is produced by vacuum induction melting followed by 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 corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-387. Producer or source: Teledyne Allvac.

MST 431

Alloy Digest ◽  
1961 ◽  
Vol 10 (10) ◽  
Keyword(s):  
Aging Treatment ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance ◽  
Solution Treated Condition ◽  
Solution Treated ◽  
Treated Condition ◽  
Alpha Beta ◽  
Reactive Metals ◽  
Principal Advantage

Abstract MST 431 is an alpha-beta type sheet alloy presently being supplied in the solution treated, solution treated and aged, and annealed conditions. Its principal advantage is good formability in the solution treated condition with subsequent high strength capability through an aging treatment. Properties indicate good strength and thermal stability for sheet applications up to 800 F for long times. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ti-30. Producer or source: Reactive Metals Corporation.

A new tool for assessing the quality of online health information on the McMaster Optimal Aging Portal

2017 ◽  
Author(s):  
Maureen Dobbins ◽  
Susannah Watson ◽  
Kristin Read ◽  
Kelly Graham ◽  
Reza Yousefi Nooraie ◽  
...  
Keyword(s):  
Health Information ◽  
Online Health Information ◽  
Optimal Aging

scholarly journals The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200 °C

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1478 ◽  
Author(s):  
Luděk Stratil ◽  
Vít Horník ◽  
Petr Dymáček ◽  
Pavla Roupcová ◽  
Jiří Svoboda
Keyword(s):  
Oxidation Resistance ◽  
Cross Sections ◽  
Aluminum Content ◽  
Energy Dispersive Spectrometer ◽  
Oxide Dispersion Strengthened ◽  
Xrd Analysis ◽  
Al Content ◽  
Α Al2o3 ◽  
New Generation ◽  
Ods Alloy

The aim of the paper is to evaluate the effect of aluminum content on the oxidation resistance of new-generation of oxide dispersion strengthened (ODS) alloy at 1200 °C. Three grades of the alloy of chemical composition Fe-15Cr-xAl-4Y2O3 with different Al contents x = 0.3 wt.%, 2.0 wt.% and 5.5 wt.% are prepared by mechanical alloying. The alloys are consolidated by high temperature rolling followed by heat treatment. To study the oxidation resistance the samples are isothermally aged in the air for 1 h, 4 h, 16 h and 64 h at 1200 °C. The oxidation kinetics, composition and formation mechanism of the oxide layers are analyzed. The weight gain of prepared steels is estimated. The kinetics of oxidation is studied on metallographic cross-sections of the exposed samples by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analysis. The oxides on the surfaces are identified by X‑ray diffraction (XRD) analysis. The Al content significantly enhances the oxidation resistance of the alloy. For a sufficiently high Al content in the alloy a compact oxide layer of α‑Al2O3 on the surface is formed, which significantly suppresses further oxidation process.

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