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Showing 1 to 20 of 22 for “"precipitation hardening"”.
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Superconductivity of a Precipitation Hardening Aluminum Alloy
Made available in DSpace on 2015-05-12T17:11:53Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0010525.PDF: 3659070 bytes, checksum: 94d3fdb44e85eb86b0d084b0ce4c0a2d (MD5) Previous issue date: 1954
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Superconductivity of a Precipitation Hardening Alloy of Aluminum
… function of temperature has been measured for a precipitation hardening aluminum alloy in various conditions of heat treatment. The alloy studied contains approximately 1.1% Mg2Si and the hardening process involves the precipitation of Mg2Si from a supersaturated solid solution. The purpose of …
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The austenite-martensite phase relationships in precipitation hardening stainless steels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Metallurgy, 1958.
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Incorporating Functionally Graded Materials and Precipitation Hardening into Microstructure Sensitive Design
… Taylor yield theory, Hill elastic bounds, and precipitation hardening. <p>Applying n-point statistics to the MSD framework is also discussed. Some results are presented for the information content of the 2-point correlation statistics that follow from the methods used to integrate functionally …
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The role of interstitial nitrogen in the precipitation hardening reactions in high-chromium ferritic steels
… - 0,04% nitrogen were found to constitute an age hardening system when quenched from a temperature of nitrogen solubility and exposed at temperatures in the range 600 - 700°C. TEM observations on thin foils revealed that hardening was associated with the formation of a high density of Cr-N zones. …
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The effect of steam treatment and precipitation hardening on the mechanical properties and wear resistance of sintered iron and iron-copper alloys
… possibility of combining steam treatment with precipitation hardening in sintered iron/copper alloys. (c) to survey the influence of process parameters on the mechanical and wear properties of these materials. Samples prepared from - 100# A.S.C. iron powder and - 100# pre-alloyed powder …
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Influence of heat treatment condition on the stress corrosion cracking properties of low pressure turbine blade steel FV520B
… solution treatment at 790°C for two hours and precipitation hardening at 545°C for six hours. In this study, the precipitation hardening temperature was varied in the range 430-600°C to investigate how this variation would affect the material and SCC properties. Hardness and tensile testing …
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Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography.
… refining, reducing the porosity, solid solution hardening, and precipitation hardening are preferred. All experimental variables such as solidification condition, composition, and heat treatment are influence on the precipitation behavior; however, precipitation hardening is the most significant …
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Inferring Microstructural Change via Non-Contact Ultrasonic Property Measurements
… inference model for microstructural evolution in precipitation-hardening alloys in order to understand the applicability of TGS as a non-destructive measure-of-health technique to investigate RPVs in commercial nuclear reactors. This is accomplished by showing the effects of solute clustering, …
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The Effect of Pressure on the Superconducting Transition in Tin
… shear stresses,4 and the effect of age or precipitation hardening.5 In this study, the basic question of the effect of a uniform, hydrostatic compression, which is the simplest stress system, is re-investigated for tin.
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The effect of solution heat treatment on the tensile and creep properties of MarM-002
… superalloy MarM-002 is a high strength precipitation hardening material used in structural applications in the gas turbine field. The microstructure of MarM-002 consists of fine y' precipitates, a y matrix, carbides and a eutectic y- y' where the y' can be composed of coarse lamellae or …
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The effect of the build orientation and heat treatment on the fatigue and fracture properties of a directed energy deposited nickel-based superalloy (Inconel 718)
… homogenise the microstructure and to introduce precipitation hardening to the material for strengthening. This heat treatment protocol consisted of a solution treatment at 1200 °C for 2 hours followed by a water quench. Thereafter an ageing procedure was conducted at 650 °C for 16 hours followed …
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Investigation of Fine-scaled Alpha Precipitation in the Modeled Ti-Mo and Ti-Mo-Al Alloys
… treatments enable us to achieve fine-scaled ⍺ precipitation at the grain boundary and in the interior of grains by activating either pseudospinodal decomposition mechanism or ω-assisted ⍺ nucleation mechanism. Additionally, it can be observed that the mechanical properties are significantly …
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Retrogression-reaging and hot forming of AA7075
… to steels at room temperature. Since AA7075 is a precipitation hardening alloy, heat treatments during forming and production need to be closely controlled to limit any loss of strength due to changes in the microstructure. Two new forming concepts are introduced to explore the feasibility of …
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Modeling Dissolution in Aluminum Alloys
… significantly with cold working, annealing, precipitation-hardening, and/or heat-treatments. Heat-treatable aluminum alloys contain one or more soluble constituents such as copper, lithium, magnesium, silicon and zinc that individually, or with other elements, can form phases that strengthen …
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Ageing and strengthening of cold-rolled Al-Mg(-Cu)-Si-Mn alloys: experimental analysis and modelling
… alloys during ageing: solid solution, work hardening, recovery and precipitation. Microstructure analyses revealed the formation of undissolved particles consuming the small Si addition, which influences age hardening behaviour of the alloys. Tensile testing was performed to evaluate the …
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Role of segregation and precipitates on interfacial strengthening mechanisms in metal matrix composites when subjected to thermo-mechanical processing
… microstructural events such as segregation and precipitation at the matrix-reinforcement interface. These events dominate the cohesive strength and subsequent mechanical properties of the interface.</p> <p>At present the relationship between the strength properties of metal matrix composites and …
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Additive Manufacturing of Aluminium-Metal Matrix Composite developed through Mechanical Alloying
… and some coupons were heat-treated to initiate precipitation-hardening intermetallics in the matrix and composite. This study investigates the suitability of the mechanical alloying as a novel method of producing feedstock material for the LM process. This research further explores the …
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In Situ Alloying of Titanium via Laser Powder Bed Fusion
… heat treatments demonstrated that precipitation hardening in the core–shell alloy is strongly influenced by β→α partitioning, with ageing at 500 °C for 4 h providing the optimal balance between strength and ductility. The final component of this thesis extends in-situ alloying to a …
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Quenching and tempering effects on Rheo-cast F357 aluminium alloy during Nd: YAG laser welding
… (TEM) and are consistent with the expected precipitation hardening processes in Al-Si-Mg alloys. The quench sensitivity of SSM F357 aluminium alloy is thus sufficiently low to obtain such an increase in strength values during laser welding, that no postweld solution heat treatment is …
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