Single-step aging treatment for a precipitation-strengthened Ni-based alloy and its influence on high-temperature mechanical behavior

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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Mechanical Behavior of High Temperature Composites

10.21236/ada281582 ◽

1994 ◽

Author(s):

Terry R. Barnett ◽

H. S. Starrett

Keyword(s):

High Temperature ◽

Mechanical Behavior

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Modeling the Mechanical Behavior of Aluminum Laminated Metal Composites During High Temperature Deformation

10.21236/ada339080 ◽

1997 ◽

Author(s):

R. B. Grishber ◽

R. S. Mishra ◽

A. K. Mukherjee

Keyword(s):

High Temperature ◽

Mechanical Behavior ◽

High Temperature Deformation ◽

Temperature Deformation ◽

Metal Composites

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The Mechanics and Mechanical Behavior of High-Temperature Intermetallic Matrix Composites

10.21236/ada382602 ◽

2000 ◽

Author(s):

Ronald Gibala ◽

Amit K. Ghosh ◽

David J. Srolovitz ◽

John W. Holmes ◽

Noboru Kikuchi

Keyword(s):

High Temperature ◽

Mechanical Behavior ◽

Matrix Composites ◽

Intermetallic Matrix ◽

Intermetallic Matrix Composites

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Determination of SiO2 Mechanical Behavior Via High Temperature Microtensile Testing

10.21236/ada413920 ◽

2001 ◽

Author(s):

R. Vinci ◽

T. Delph ◽

R. Jaccodine

Keyword(s):

High Temperature ◽

Mechanical Behavior ◽

Microtensile Testing

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A Method for Predicting the Behavior of Plastics at Different Temperatures

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1039.107 ◽

2014 ◽

Vol 1039 ◽

pp. 107-111

Author(s):

Yang Chen ◽

Gui Qin Li ◽

Bin Ruan ◽

Xiao Yuan ◽

Hong Bo Li

Keyword(s):

High Temperature ◽

Low Temperature ◽

Constitutive Model ◽

Research And Development ◽

Mechanical Behavior ◽

Plastic Material ◽

Different Temperatures ◽

Plastic Parts

The mechanical behavior of plastic material is dramatically sensitive to temperature. An method is proposed to predict the mechanical behavior of plastics for cars, ranging from low-temperature low temperature ≤-40°C to high temperature ≥80°C. It dominates the behavior of plastic material based on improved constitutive model in which the parameters adjusted by a series of tests under different temperatures. The method is validated with test and establishes the basis for research and development of plastic parts for automobile as well.

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Influence of High Temperature Annealing on Microstructure Evolution of Ni-24Fe-14Cr-8Mo Superalloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.904.117 ◽

2021 ◽

Vol 904 ◽

pp. 117-123

Author(s):

Yi Cui ◽

Yun Fei Zhang ◽

Yan Guang Han ◽

Da Lv

Keyword(s):

High Temperature ◽

Microstructure Evolution ◽

Testing Machine ◽

Aging Treatment ◽

Growth Patterns ◽

High Temperature Annealing ◽

Rockwell Hardness ◽

Hardness Testing ◽

X Ray Diffraction ◽

X Ray

The effect of high temperature annealing on microstructure evolution of Ni-24Fe-14Cr-8Mo alloy was investigated through Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD) and Rockwell Hardness Testing Machine. Three kinds of grain growth patterns were found at different annealing temperatures due to carbides precipitation and dissolution. After a combination of high temperature annealing and aging treatment, the hardness versus time curves performed a parabolic pattern. The highest hardness was achieved under 1070°C/60 minutes treatment, and the desirable annealing time should be 60 minutes to 90 minutes.

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Martensite decomposition during post-heat treatments and the aging response of near-α Ti–6Al–2Sn–4Zr–2Mo (Ti-6242) titanium alloy processed by selective laser melting (SLM)

Journal of Micromechanics and Molecular Physics ◽

10.1142/s2424913020500186 ◽

2021 ◽

pp. 2050018

Author(s):

Haiyang Fan ◽

Yahui Liu ◽

Shoufeng Yang

Keyword(s):

Titanium Alloy ◽

High Temperature ◽

Titanium Alloys ◽

Selective Laser Melting ◽

Room Temperature ◽

Elevated Temperatures ◽

Aging Treatment ◽

Water Quenching ◽

Laser Melting ◽

Aging Response

Ti–6Al–2Sn–4Zr–2Mo (Ti-6242), a near-[Formula: see text] titanium alloy explicitly designed for high-temperature applications, consists of a martensitic structure after selective laser melting (SLM). However, martensite is thermally unstable and thus adverse to the long-term service at high temperatures. Hence, understanding martensite decomposition is a high priority for seeking post-heat treatment for SLMed Ti-6242. Besides, compared to the room-temperature titanium alloys like Ti–6Al–4V, aging treatment is indispensable to high-temperature near-[Formula: see text] titanium alloys so that their microstructures and mechanical properties are pre-stabilized before working at elevated temperatures. Therefore, the aging response of the material is another concern of this study. To elaborate the two concerns, SLMed Ti-6242 was first isothermally annealed at 650[Formula: see text]C and then water-quenched to room temperature, followed by standard aging at 595[Formula: see text]C. The microstructure analysis revealed a temperature-dependent martensite decomposition, which proceeded sluggishly at [Formula: see text]C despite a long duration but rapidly transformed into lamellar [Formula: see text] above the martensite transition zone (770[Formula: see text]C). As heating to [Formula: see text]C), it produced a coarse microstructure containing new martensites formed in water quenching. The subsequent mechanical testing indicated that SLM-built Ti-6242 is excellent in terms of both room- and high-temperature tensile properties, with around 1400 MPa (UTS)[Formula: see text]5% elongation and 1150 MPa (UTS)[Formula: see text]10% elongation, respectively. However, the combination of water quenching and aging embrittled the as-built material severely.

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