Effect of hot forming on anisotropy of mechanical properties of high-temperature 901 alloy

2021 ◽  
pp. 459-463
Author(s):  
A.V. Pchel'nikov ◽  
V.A. Filyakova ◽  
A.A. Sidorov
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Temperature ◽  
Hot Forming ◽  
Test Results ◽  
Initial Blank ◽  
Anisotropy Of Mechanical Properties

The effect of the macrostructure drawing after forming of blank made of high-temperature 901 alloy on the anisotropy of mechanical properties is studied. The effect of drawing on anisotropy is considered taking into account the unevenness of plastic deformation during upsetting and taking into account the deformation accumulated during the forging of the rod for the initial blank. The results of upsetting simulation and the test results of the samples mechanical properties cut in different directions of the blank fiber are presented.

Application of Small Punch Test to Evaluate Tensile Properties of SA213T22 Grade Boiler Steel

2015 ◽  
Vol 830-831 ◽  
pp. 191-194
Author(s):  
M. Venkateswara Rao
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Tensile Properties ◽  
Test Methods ◽  
Uniaxial Tensile ◽  
Test Results ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Aging Phenomena

Conventional tensile test methods are used for service exposed high temperature boiler tubes to evaluate the deterioration in mechanical properties such as tensile strength, yield strength and percentage elongation. The mechanical properties are required to be evaluated periodically as the boiler components undergo material degradation due to aging phenomena. The aging phenomena occurs due to continuous exposure of tubes to high temperature & pressure steam prevailing inside the tubes and high temperature exposure to corrosive combustible gases from the external surfaces within the boiler.A recent developed new technique called small punch testing has been used to evaluate the tensile properties of SA 213T22 grade steel predominantly exists in super-heater and re-heater sections of boiler. The small punch tests have been carried out on the miniature disk shaped specimens of diameter of 8.0 mm and 0.5 mm thickness extracted from both the new and service exposed tubes. Conventional uniaxial tensile tests on standard specimens from the same tube material have also been performed for comparison. The service exposed tubes showed considerable loss in mechanical properties in both the conventional and small punch test results. Correlations of tensile properties have been obtained based on the comparative analysis of both small punch and uniaxial tensile test results. Further, the study showed that an appropriate empirical relation could be generated for new and service exposed materials between both the techniques. Conventional test methods require large quantity of material removal for test samples from in-service components whereas small punch test method needs only a miniature sample extraction. This small punch test technique could also be extended to evaluate the thicker section boiler components such as pipelines and headers in the boiler as a part of remaining life assessment study. Also this technique could be a useful tool to any metallic component where large quantity of sample removal may be difficult or may not be feasible.

Intermetallics of Aluminum

2019 ◽  
Author(s):  
Georg Frommeyer ◽  
Sven Knippscheer
Keyword(s):  
Crystal Structure ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Temperature ◽  
Physical Properties ◽  
Intermetallic Compounds ◽  
Oxidation Behavior ◽  
Physical And Mechanical Properties ◽  
Structural Materials

Aluminum-rich intermetallic compounds of the Al3X-type with transmission metals (X = Ti. Zr, Nb, V) of Groups IVb and Vb are of interest in the development of novel high-temperature and lightweight structural materials. This article describes the important physical and mechanical properties of trialuminides with DO22 structure and their L12 variations. Topical coverage includes: crystal structure and selected physical properties, plastic deformation, oxidation behavior, and applications.

Characteristics of Plasticity and Microstructure of Hot Forming Magnesium Alloys Mg-Al-Zn Type / Charakterystyki Plastycznosci I Mikrostruktura Odkształcanych Na Goraco Stopów Magnezu Typu Mg-Al-Zn

2013 ◽  
Vol 58 (1) ◽  
pp. 151-156 ◽  
Author(s):  
D. Kuc ◽  
E. Hadasik ◽  
I. Schindler ◽  
P. Kawulok ◽  
R. Sliwa
Keyword(s):  
Activation Energy ◽  
Plastic Deformation ◽  
Magnesium Alloys ◽  
Hot Forming ◽  
Aluminium Content ◽  
Test Results ◽  
Compression Tests ◽  
Hot Plastic Deformation ◽  
Twin Formation ◽  
Reduction Of Area

The paper presents analysis of plasticity characteristics and microstructure of magnesium alloys for hot plastic treatment with different aluminium content (3÷8%). Tests were conducted for assessment of susceptibility of tested alloys to hot plastic deformation. A tensile test was run in temperature from 250 to 450°C. Based on the results, ultimate tensile strength (UTS) and reduction of area (Z) were determined for samples. Conducted compression tests allowed to specify the flow stress and microstructure changes after deformation. The activation energy in hot forming was determined for investigated alloys. The parameters of the process where flow is significantly influenced by twin formation in microstructure were determined. A varied plasticity of tested alloys was found depending on aluminium content. Test results will be useful in development of forging technology of selected construction elements which serve as light substitutes for currently used materials.

Effect of Zr Addition on High Temperature Mechanical Properties of Near Alpha Ti-Al-Zr-Sn Based Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 580-583 ◽  
Author(s):  
Murugesan Jayaprakash ◽  
De Hai Ping ◽  
Y. Yamabe-Mitarai
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Room Temperature ◽  
High Temperature Strength ◽  
Test Results ◽  
High Temperature Mechanical Properties ◽  
Ti Alloys ◽  
Zr Addition ◽  
And Performance ◽  
Compressive Tests

Titanium (Ti) alloys are widely used in aerospace industries successfully up to 600°C. Increasing the operating temperature and performance of these alloys would be very useful for fuel economy. Numerous numbers of research works has been focused on the improvement of the high temperature performances of Ti alloys. It has been well known that Zirconium (Zr) is one of the important solid-solution strengthener in Ti-alloys. In the present study, the effect of Zr addition on the microstructure and mechanical properties of the near–α Ti-Al-Zr-Sn based alloys has been investigated.The compression test results showed that Zr addition significantly improves both room temperature and high temperature strength. The results obtained were explained based on the microstructural observation, room temperature and high temperature compressive tests.

Analysis of the Fundamental Mechanisms and Efficiency of the Deformation Methods of Nanostructuring

2008 ◽  
Vol 584-586 ◽  
pp. 29-34 ◽  
Author(s):  
Radik R. Mulyukov ◽  
Ayrat A. Nazarov ◽  
Renat M. Imayev
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Pressure ◽  
High Temperature ◽  
Severe Plastic Deformation ◽  
Grain Refinement ◽  
Equal Channel Angular Pressing ◽  
Efficient Method ◽  
High Pressure Torsion ◽  
Angular Pressing

Deformation methods of nanostructuring (DMNs) of materials are proposed to classify into severe plastic deformation (SPD) and mild plastic deformation (MPD) methods according to fundamentally different low- and high-temperature grain refinement mechanisms they exploit. A general analysis of the fundamentals and nanostructuring efficiency of three most developed DMNs, high pressure torsion (HPT), equal-channel angular pressing (ECAP), and multiple isothermal forging (MIF) is done with a particular attention to ECAP and MIF. It is demonstrated that MIF is the most efficient method of DMNs allowing one to obtain the bulkiest nanostructured samples with enhanced mechanical properties.

A Study of Creep in Polysilicon MEMS Devices

2005 ◽  
Vol 127 (1) ◽  
pp. 90-96 ◽  
Author(s):  
K. Tuck ◽  
A. Jungen ◽  
A. Geisberger ◽  
M. Ellis ◽  
G. Skidmore
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
High Temperature ◽  
Creep Rate ◽  
Region Of Interest ◽  
Material Behavior ◽  
Mems Devices ◽  
Test Device ◽  
Micro Scale ◽  
Moderate Stress

Plastic deformation of polysilicon at high temperatures under stress due to creep has been demonstrated at the micro scale. This type of material behavior is generally associated with mechanical failure, however it can also be used to permanently deform or position a device. In order for creep in polysilicon to be used for MEMS applications its mechanical properties must be investigated. In this work, an experimental micro test structure is developed and measurements of high temperature plastic deformation within polysilicon are conducted. Both increases in temperature and stress are shown to increase the creep rate within the studied beams in the region of interest of the test device. Immediate plastic deformation of polysilicon has been observed to start at approximately 63% of the absolute melting temperature under moderate stress.

Microstructures and Mechanical Properties of β-Sialon-cBN Composites

2016 ◽  
Vol 697 ◽  
pp. 515-520
Author(s):  
Xin Ze Wu ◽  
Yi Wu ◽  
Jin Long Han ◽  
Tian Yu Shen
Keyword(s):  
Mechanical Properties ◽  
Computer Simulation ◽  
High Pressure ◽  
High Temperature ◽  
Boron Nitride ◽  
Oxygen Content ◽  
Cubic Boron Nitride ◽  
Test Results ◽  
Microstructure And Mechanical Properties ◽  
Z Value

β-Sialon-cubic boron nitride (cBN) composites were prepared by the high temperature (1700°C) and high pressure (5GPa) sintering. β-Sialon chemical general composition can be represented as Si6-zAlzOzN8 –z (Z is the number of Al atoms which are substituted by Si atoms, and the range of z value is usually between 0-4.2[1].).The effects of different formula with corresponding to z values on microstructure and mechanical properties of β-Sialon-cBN composites were studied. The relative test results were verified by computer simulation. The study result showed: with the z values of β-Sialon increasing, the aluminum and oxygen content increased. The densification and mechanical properties of β-Sialon-cBN composites decreased gradually.

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