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Lehigh University

1969

Materials Science and Engineering

Articles 1 - 16 of 16

Full-Text Articles in Engineering

Precipitation Studies Of Pb In Single Crystal Pbte, Walter Ludwig Erhard Jan 1969

Precipitation Studies Of Pb In Single Crystal Pbte, Walter Ludwig Erhard

Theses and Dissertations

A study of the kinetics of precipitation of excess Pb in PbTe was made by the use of Hall measurements. The objective was to find how excess Pb precipitated.


The Effect Of Carbide-Forming Elements On The Structure And Mechanical Properties Produced Produced By Cyclic Transformation, Charles Arthur Apple Jan 1969

The Effect Of Carbide-Forming Elements On The Structure And Mechanical Properties Produced Produced By Cyclic Transformation, Charles Arthur Apple

Theses and Dissertations

Cyclic martensitic transformation was performed on two Fe-Ni-.3C base alloys containing the carbide-forming elements Cr or V and on a plain Fe-Ni-.3C alloy. Martensite was formed by cooling in liquid nitrogen and austenite was produced by heating in molten salt or lead to reversal temperatures selected to be approximately 10 C above the appropriate temperature determined by quantitative X-ray measurements of martensite.


The Fatigue Behavior Of Sintered Iron Powder Compacts, Richard S. Bankowski Jan 1969

The Fatigue Behavior Of Sintered Iron Powder Compacts, Richard S. Bankowski

Theses and Dissertations

Stress-endurance curves were determined and the fatigue limits were defined as a function of sintered density for reverse-bend stressing of sintered iron specimens.


A Dynamic Programming Simulation Of The Electroslag Remelting Process, Ronald C. Gover Jan 1969

A Dynamic Programming Simulation Of The Electroslag Remelting Process, Ronald C. Gover

Theses and Dissertations

A statistical study was made of the changes occurring in slag composition and remelted ingot composition during the electroslag remelting of five heats of three different grades of stainless steel. It was found that changes in flux chemistry were numerous and accurate prediction of flux composition was possible from the calcium fluoride content alone.


A Study Of The Stress Corrosion Cracking Of 7075 T6 Aluminum Alloy Using Fracture Mechanics Concepts, Andrew Paul Popichak Jan 1969

A Study Of The Stress Corrosion Cracking Of 7075 T6 Aluminum Alloy Using Fracture Mechanics Concepts, Andrew Paul Popichak

Theses and Dissertations

This investigation was undertaken to characterize the dependency of stress corrosion cracking of aluminum alloy 7075 - T6 in aqueous 3 1/2% NaC1 solution. As part of the investigation, the growth of stress corrosion cracks in plane strain, short transverse orientation specimens was monitored optically.


Void Behavior As Influenced By Deformation And Pressure, Kurt J. Kahlow Jan 1969

Void Behavior As Influenced By Deformation And Pressure, Kurt J. Kahlow

Theses and Dissertations

Void formation, growth, and coalescence have a pronounced effect on the properties of most materials. Void behavior is strongly influenced by the type of deformation process and the magnitude of hydrostatic pressure.


The Bending Of Polymer Material Under Tension As Related To A Deep Drawing Process, William B. Buettner Jan 1969

The Bending Of Polymer Material Under Tension As Related To A Deep Drawing Process, William B. Buettner

Theses and Dissertations

Two engineering plastics, an acrylonitrile-butadiene-styrene resin and a rigid polyvinyl chloride resin were investigated to determine the effects of cold working. Bending under tension stress sytem of a deep drawing process was considered.


The Adhesion Of Gold To Aluminum Oxide, James L. Brandner Jan 1969

The Adhesion Of Gold To Aluminum Oxide, James L. Brandner

Theses and Dissertations

The adhesion of gold to sapphire has been investigated in an effort to develop a bonding model for Au/A12o3 system. Ultra-pure gold was bonded to sapphire by melting it on sapphire disks in a furnace with a controlled atmosphere.


Correlation Between Surface Condition And Mechanical Strength Of High Alumina Ceramic Substrates, Raymond F. Gruszka Jan 1969

Correlation Between Surface Condition And Mechanical Strength Of High Alumina Ceramic Substrates, Raymond F. Gruszka

Theses and Dissertations

The surfaces of a fine grained, high alumina ceramic substrate material were modified by various treatments in order to determine the effect of surface character on fracture strength. The resulting surfaces were characterized by profilometer measurements and electron microscopy. Fracture strengths were determined by transverse bend tests using four point loading.


A Study Of Parameters Affecting Ultrasonic Welding, Walter K. Johnston Jan 1969

A Study Of Parameters Affecting Ultrasonic Welding, Walter K. Johnston

Theses and Dissertations

A bond is created by vibrations, in the case of ultrasonic welding, which induce relative motion between two weldment members held together by an external clamping force. The relative motion and the clamping force combine to create shear strains in the interface which mechanically break-up the oxide thus providing clean surfaces by exposing fresh metal.


The Effects Of Changes In Au Concentration Upon The Microstructure And Magnetic Properties Of Au-Fe-Co Alloys, Larry Lynch Jan 1969

The Effects Of Changes In Au Concentration Upon The Microstructure And Magnetic Properties Of Au-Fe-Co Alloys, Larry Lynch

Theses and Dissertations

Au-Fe-Co alloys with a constant Co-Fe ration of 7, and Au contents ranging from 0.5% to 18% were cast, solution annealed, and cold-rolled into thin strips. Light and electron metallographic techniques and electron microprobe analysis established that alloys cold-worked 75 and 90% exhibited simultaneous recrystallization and Au precipitation on heating. Direct current magnetic measurements showed that coercive force increased with Au additions up to 14% and decreased thereafter.


Effect Of Tempering On The Anodic Polarization Behavior Of An 11 Cr-12 Ni Martensitic Stainless Steel, Kenneth G. Moerschel Jan 1969

Effect Of Tempering On The Anodic Polarization Behavior Of An 11 Cr-12 Ni Martensitic Stainless Steel, Kenneth G. Moerschel

Theses and Dissertations

Anodic polarization measurements in 1.ON H2SO4 and in 1.ON H2SO4 + .1M NaC1 were made on an 11 Cr - 12 Ni martensitic stainless steel in the as-rolled, as-quenched and quenched and tempered conditions. Structural changes on tempering between 100C and 600C were evaluated by hardness measurements, light metallography and transmission electron microscopy.


An Investigation Of The Effect Of Metastable Phases Of Alumina On The Thermal Conductivity Of Plasma Sprayed Alumina Coatings, Theodore W. Robbins Jan 1969

An Investigation Of The Effect Of Metastable Phases Of Alumina On The Thermal Conductivity Of Plasma Sprayed Alumina Coatings, Theodore W. Robbins

Theses and Dissertations

The effect of five plasma spraying variables on the apparent porosity and volume percent metastable phase of alumina coatings was studied. The five variables were; arc gas flow rate, power input, powder size, powder feed rate, and substrate temperature.


The Effects Of Deformation Under Hydrostatic Pressure Upon The Mechanical Properties Of E C Aluminum, Glenn L. Schmehl Jan 1969

The Effects Of Deformation Under Hydrostatic Pressure Upon The Mechanical Properties Of E C Aluminum, Glenn L. Schmehl

Theses and Dissertations

EC aluminum was deformed to various degrees of pre-strain in biaxial compression under several hydrostatic pressures. Teh resulting density, tensile properties, elongation, grain structure, and micro-hardness were measured as a function of the amount of pre-strain.


Characterization Of A Photosensitive Tin(Ii) Compound, Paul J. Sewall Jan 1969

Characterization Of A Photosensitive Tin(Ii) Compound, Paul J. Sewall

Theses and Dissertations

A process for the selective deposition of metals on substrates was recently developed. The process utilizes an invisible film of a photosensitive tin compound which is deposited on a substrate by immersing it in an acid solution of stannous chloride and then rinsing it in deionized water. This study was undertaken to characterize the unknown photosensitive compound and to investigate the effects of the surrounding atmosphere on the phototchemical reaction rate.


The Influence Of Warm Prestressing On The Strength, Ductility, And Toughness Of Pressure Vessel Steels, Lawrence N. Succop Jan 1969

The Influence Of Warm Prestressing On The Strength, Ductility, And Toughness Of Pressure Vessel Steels, Lawrence N. Succop

Theses and Dissertations

The positive beneficial effects of warm prestressing have been demonstrated in a number of lavoratory tests and in principle, should have considerable value in enhancing the fracture capability of pressure vessels. However, there is some indication that the beneficial effects may be lost once actual vessel operational conditions, such as with prolonged thermal exposure. This embrittlement may be enough to trigger a catastrophic failure in the pressure vessels. An investigation was launched to study the effects of strain aging embrittlement, arising from overstressing techniques, on two pressure vessel steels, A533B and A516 grade 70.