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2 edition of Effect of porosity and elevated temperatures on the tensile properties of cast superalloys. found in the catalog.

Effect of porosity and elevated temperatures on the tensile properties of cast superalloys.

Feraz Aslam Toosy

Effect of porosity and elevated temperatures on the tensile properties of cast superalloys.

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Published by University of Birmingham in Birmingham .
Written in English


Edition Notes

Thesis (Ph.D.) - University of Birmingham, Dept of Metallurgy and Materials.

ID Numbers
Open LibraryOL13802380M

In the present study, tensile tests of 63Sn/37Pb solder were carried out at various strain rates from × 10−5 s−1 to × 10−1 s−1, over a wide temperature range from – 40 oC to oC, to investigate the effect oftest temperature and strain rate on the mechanical properties in a systematic manner. Effect of heat treatment on microstructure and tensile properties of A alloys PENG Ji-hua 1, TANG Xiao-long, HE Jian-ting, XU De-ying2 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou , China; 2. Institute of Nonferrous Metal, Guangzhou Jinbang Nonferrous Co. Ltd., Guangzhou , China.


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Effect of porosity and elevated temperatures on the tensile properties of cast superalloys. by Feraz Aslam Toosy Download PDF EPUB FB2

A positive effect of a HIP treatment on LCF life has been reported for moderate temperatures up to °C [12, ], while the actual results show such positive effect for higher temperatures of °C as well.

Further, it can be concluded that large eutectics have a higher negative impact on fatigue life than the porosity occurring in Cited by: 7. Vol. 7, No. 2, Effect of Porosity on the Tensile Properties of Low Ductility Aluminum Alloys differential weighing technique in air and water and were compared with a standard sample cast in a large mass per-manent Cu mold.

To determine the global volumetric porosity, 18 × 18 × mm bars were cut perpendicularly to the long-File Size: 1MB. Introduction. Several studies in the literature correlate the porosity and mechanical properties of cast aluminum alloys and most of these studies use the parameter of global volumetric porosity to determine this correlation.

Apart from the porosity effect, the mechanical properties of these alloys generally result from a set of variables such as chemical composition 6,7, morphology. A superalloy, or high-performance alloy, is an alloy with the ability to operate at a high fraction of its melting point.

Several key characteristics of a superalloy are excellent mechanical strength, resistance to thermal creep deformation, good surface stability, and resistance to corrosion or oxidation.

The crystal structure is typically face-centered cubic (FCC) austenitic. Nickel-based superalloys. Nickel-based superalloys usually combine high strength and corrosion resistance during service at elevated temperatures.

Initially, their development was encouraged and driven by the insight that the efficiency of thermal power generation machines can be increased by increasing the combustion temperature and/or.

During the last few decades, Ni-based superalloys have attracted considerable attention owing to their striking properties at elevated temperatures, such as high tensile and compressive yield.

The elevated temperature tensile, stress-rupture and creep properties and residual tensile properties after creep straining have been determined for two cast superalloys and several wrought NiCr-4Al-yttria oxide dispersion strengthened (ODS) alloys.

The creep behavior of the ODS alloys is similar to that of previously studied ODS nickel by: Development of Nickel Based Superalloys for Advanced Turbine Engines Article (PDF Available) in Materials Science Forum May with Reads How we measure 'reads'.

A combined experimental and computational study is performed to investigate the effect of centerline shrinkage porosity on deformation, damage, and fracture of cast steel under tensile testing. Steel plates containing shrinkage porosity are cast in sand molds, machined into test coupons, and tensile tested to fracture.

The average volumetric porosity in the gage section of the specimens with Cited by: EFFECT OF POROSITY ON MECHANICAL PROPERTIES OF CAST STEEL R.A. Hardin1and C. Beckermann2 1Research Engineer, Mechanical and Industrial Engineering University of Iowa 2Professor, Mechanical and Industrial Engineering University of Iowa Abstract Porosity is measured from radiographs of steel fatigue test specimens taken prior to.

8o TechnologicPapersoftheBureauofStandards[Vol Table2and,ingeneral,confirmedtheworkofMacPherran wheredirectcomparisonswerepossible. TABLE1 File Size: 1MB. In this thesis the influence of grain size on the mechanical properties of Inconel has been studied. In is commonly used superalloy which has a relatively low cost but offer good mechanical properties.

The research work was conducted from preparing two specimens of In that has been heat treated at different temperatures. The grain. A compilation of data collected and maintained for many years as the property of a large aluminum company, which decided in to make it available to other engineers and materials specialists.

In tabular form, presents data on the tensile and creep properties of eight species of wrought alloys and five species of cast alloys in the various shapes used in applications.4/5(3). The distribution of shrinkage porosities in sand cast Mg-Y-RE (WE54) alloy castings was characterized through density measurement and calculated by Archimedess principle.

The effect of porosity on mechanical properties of sand cast WE54 alloy was investigated through tensile tests and microstructure observation.

It was found that the shrinkage porosities distributed mainly in the middle of the Cited by: 5. Influence of Both γ′ Distribution and Grain Size on the Tensile Properties of UDIMET Li At Room Temperature (Pages: ) Properties of New C&W Superalloys for High Temperature Disk Applications (Pages: ) The Creep and Fatigue Behavior of Haynes at Elevated Temperatures (Pages: ) Sara C.

Longanbach; Carl J. 68o TechnologicPapersoftheBureauofStandards[Vol Page. sionandsummary ousmetaltheory y ledgements VII. EFFECT OF POROSITY ON DEFORMATION, DAMAGE, AND FRACTURE OF CAST STEEL Richard Hardin1, Christoph Beckermann1.

1University of Iowa, Department of Mechanical and Industrial Engineering, SC. Iowa City, IA Keywords: Casting, Porosity, Tensile Properties, Damage, Fracture. The effect of porosity on yield and tensile strength, ductility and fatigue properties is summarised below - Increasing area fractions of porosity in a weld cross-section reduce strength.

Fine porosity - when present in sufficient quantity to contribute a total area comparable to that of large pores. Effect of oxide films on tensile properties of castings Fe-rich intermetallic phase in cast Al-Si-Mg alloy Effect of Fe-rich phases on tensile properties of the castings Porosity defects in cast Al-Si-Mg alloy Effect of porosity on tensile properties of the castings hand a spherical pore with low porosity is noticed in samples sintered at °C.

This results in a remarkable enhancement of mechanical properties like micro hardness and radial crush strength. Fig. 3 depicts the sintering temperature effect on porosity for the samples of all the three groups. The effects of microstructure and porosity were investigated on the tensile properties of AC4B type Al-Si-Cu cast alloys containing 7 mass % Si, 3 mass % Cu, mass % Mg, 0 to mass % Fe and 0 to mass % Sr.

The specimens were solidified at a cooling velocity of K/s or K/s in metallic : Hyogyoung Kang, Hirofumi Miyahara, Keisaku Ogi. The effect of HIPping on the mechanical properties and microstructure of a cast Ti-6Cr-5Mo-5V-4Al alloy have been investigated. In the cast condition, the alloy predominantly consists of coarse β grains.

In comparison to the HIPped samples, it exhibits poor mechanical properties, in particular low ductility, due to large amounts of remnant by: 1. The Term 'superalloy' refers to metalic alloys that have been designed to withstand high temperatures and mechanical loads without deforming, including specifically creep, or of these superalloys have been developed for applications in fields such as gas turbines and jet engines, that is in areas where extreme heat together with mechanical loading occur.

the surface have an effect on all the mechanical properties of coated superalloys. For the Ni-Cr-Al and Ni-Co-Cr-Al systems, TEC studies were carried out on samples made by extruding cast billets.

The Co-Ni-Cr-Al sys-tem samples are studied as-cast. To study TEC, the to mm thick condensates deposited by the electron beam (EB) method. @article{osti_, title = {Elevated temperature mechanical behavior of new low CTE superalloys}, author = {Cowen, C J and Jablonski, P D}, abstractNote = {This paper presents the high temperature mechanical properties of several experimental low coefficient of thermal expansion (CTE) alloys.

The use of such alloys facilitate the extension of advanced ferritic stainless steels to higher use. Mechanical testing and deformation analysis. To demonstrate the effect of the new strengthening mechanism, we examine two similar Ni-base superalloys, ME3 and ME, for which the main difference Cited by: Powder metallurgy superalloys were developed in the mid's when stronger aircraft turbine disk materials were needed.

Their characteristics of greatly reduced segregation, better hot-workability, improved mechanical properties, and cost-effective manufacturing processes made P/M superalloys highly desirable in high-temperature applications.

page 1 effect of a supersolvus heat tr eatment on the microstructure and mechanical properties of a powder metallurgy processed nickel-base superalloy by darryl slade stolz a dissertation presented to the graduate school of the university of flor ida in partial fulfillment of the requirements for the degree of doctor of philosophy university of florida Mechanical properties of structural steel at elevated temperatures and after cooling down, Fire and materials, An International Journal, Vol.

28, No, pp, John Wiley& Sons, H Outinen J. Mechanical properties of structural steels at elevated temperatures and after cooling down, Fire andCited by: Nickel-based superalloys, which have excellent mechanical properties, high temperature oxidation resistance, and fatigue resistance at elevated temperatures, have been used extensively in aerospace, gas turbine engines, and power generation for decades [1,2,3,4,5,6].The ever-increasing demand for more efficient and powerful turbine engines continues to drive the need to improve or develop Author: Li-Shi-Bao Ling, Zheng Yin, Zhi Hu, Jun Wang, Bao-De Sun.

You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.

Superalloys are used in the cast, rolled, extruded, forged and powder produced forms as shown in the overall process flow in Fig. Wrought alloys are generally more uniform with finer grain sizes and superior tensile and fatigue properties, while cast alloys have more alloy segregation and coarser grain sizes J Induction vacuum L ~1 Melting.

However, there is one disadvantage of such castings, that is, the presence of various defects such as porosity and its effect on mechanical properties. The aim of this work was to investigate the influence of porosity on the fatigue strength of high-pressure die cast aluminium.

The effects of the γ″-Ni 3 Nb phase on the mechanical properties of Inconel superalloys, with standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging, were characterized by morphological observation, X-ray diffraction, and tensile experiments.

The results of the morphological observation revealed that many fine γ. differences between the wrought and cast versions of stainless steels can affect performance. (See Role of Alloying Elements.) Some stainless steel casting grades can be precipitation-hardened by heat treatment, but the mechanical properties of most rely on their chemical composition.

The yield and tensile. properties of aluminum and its alloys (see Fig. Fig. 1 shows that 3 % of porosity in AlSi5 alloy decreases its tensile strength from MPa to approx. MPa (i.e. decrease of 40 %). Fig. Dependence of tensile strength on porosity 2.

The preparation of the casts Approx. kg of pure batch of alloyed AlSi7Mg alloy. The effect of boundary conditions of casting on the size of porosity of heavy steel ingot M. Tkadlečková a,*, K.

Michalek a, K. Gryc a, B. Smetana b, P. Machovčák c, L. Socha a a Department of Metallurgy and Foundry and Regional Materials Science and Technology Centre, VŠB - Technical University of Ostrava. Effect of sintering on tensile property of fiber felt.

Considering essential manufacturing parameters, sintering temperature and sintering time have a major effect on the forming process of the fiber felt. Sintering temperature. The tensile strengths of samples sintered at oC, oC and oC are 16 MPa, MPa and MPa respectively.

Brinell hardness test for grey cast iron ISO/TC ISO/R Mechanical testing of steel at elevated temperatures — Determination of lower yield stress and proof stress and proving test Metallic materials — Measurement of mechanical properties by an instrumented indentation test — Indentation tensile properties Effect of sprue height on pressure required to form a bubble in cast iron.

(Open symbols were castings with blowholes; closed symbols were castings without blowholes.) To calculate the pressure of gas in a mold or core it is necessary to know how much gas is created at the mold metal interface.

Figure-3a below presents the result of the tensile testing for Nodular Cast Iron and the result of heat treatment for single-step and two-step austempering methods. Based on the result of the tensile testing, it was found that the tensile strength increased along with the File Size: KB.requires excellent mechanical properties at elevated temperatures.

Superalloys are also utilized in the chemical and petrochemical industries apart from the gas turbine industry. In aircraft gas turbine components these superalloys may find their applications in disks, bolts, shafts, cases, blades, vanes, combustors, afterburners etc (basically File Size: KB.The combined analysis of tensile, fatigue, and creep data presented in this article is much more comprehen-sive than what have previously been published.

Never-theless, since mechanical tests at elevated temperatures are rather expensive, it is important to find possibilities to predict material behavior at temperatures where data do not exist.