tag:blogger.com,1999:blog-63211215935782228752026-10-16T05:35:33.960+03:00Metallurgy & Material EngineeringAnonymoushttp://www.blogger.com/profile/02271647055755524859noreply@blogger.comBlogger18125tag:blogger.com,1999:blog-6321121593578222875.post-85645635297543500912011-07-05T17:44:00.001+02:002011-07-05T17:45:53.022+02:00Title Introduction in Materials Science and EngineeringMATERIALS SCIENCE AND ENGINEERING
Materials science involves investigating the relationships that exist between the structures and properties of materials. Materials engineering is, the basis of these structure–property correlations, designing or engineering the structure of a material to produce a predetermined set of properties.
So what Structure and property means?
The Definitions of Anonymoushttp://www.blogger.com/profile/11378056562153858006noreply@blogger.com1tag:blogger.com,1999:blog-6321121593578222875.post-12029246869693455772009-10-07T14:30:00.006+02:002009-10-07T15:46:03.911+02:00Cathodic protection of pipeline7. Cathodic protection of pipelineDiscovery of the cathodic protection principleAbout 1820 the Navy Board was anxious to find the reason why copper sometimes got fouled, whilst iron was dissolving, and at other times the copper was dissolving rather too quickly. A Committee was formed with the Royal Society, of which Sir Humphry Davy was President. Davy had already in 1806 advanced the Unknownnoreply@blogger.com2tag:blogger.com,1999:blog-6321121593578222875.post-315410451565804292009-10-07T13:47:00.007+02:002009-10-07T14:28:17.750+02:00Types of Corrosion6. Corrosion of pipeline 6.1 TYPES OF CORROSION Basically, there are four ways corrosion can occur. Corrosion can occur through a chemical reaction or three general types of electrochemical reactions. The three general types of electrochemical reactions that occur depend on the cause of the potential difference between the anode and the cathode. This potential difference can be caused by Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-29001781010607589032009-10-07T12:20:00.005+02:002009-10-07T13:14:15.312+02:00Cathodic Protection of Pipeline ( corrosion )1 - principles of corrosion Introduction1.1 importance of corrosion studies 1.2 Examples of Catastrophic Corrosion Damage1.2.1 Sewer explosion, Mexico1.2.2 Loss of USAF F16 fighter aircraft1.3 corrosion definition1.3.1 THE CONSEQUENCES OF CORROSION1.4 corrosion principles1.5 classification of corrosion2. Forms of corrosion2.1 Uniform corrosion or general corrosion2.1.1 Mechanisms2.1.2 Prevention Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-6321121593578222875.post-54780948566976220482009-06-24T05:58:00.001+03:002009-06-24T06:37:31.191+03:00preparation of pipeline<!-- /* Font Definitions */ @font-face {font-family:Wingdings; panose-1:5 0 0 0 0 0 0 0 0 0; mso-font-charset:2; mso-generic-font-family:auto; mso-font-pitch:variable; mso-font-signature:0 268435456 0 0 -2147483648 0;} @font-face {font-family:Verdana; panose-1:2 11 6 4 3 5 4 4 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:536871559Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-44831418742261847162009-06-23T03:06:00.001+03:002011-03-24T16:42:32.968+02:00Corrosion PreventionBy retarding either the anodic or cathodic reactions the rate of corrosion can be reduced. This can be achieved in several ways :
4.3.1 Conditioning the Metal
This can be sub-divided into two main groups:
(a) Coating the metal, in order to interpose a corrosion resistant coating between metal and environment. The coating may consist of:
(i) another metal , e.g. zinc or tin coatings on steel,
(iiUnknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-33547039801667190562009-06-23T02:20:00.003+03:002009-06-23T04:05:22.886+03:00Material selection4.2 Material selection<!--[if gte mso 9]> Normal 0 false false false MicrosoftInternetExplorer4 <![endif]--><!--[if gte mso 9]> <![endif]--> <!-- /* Font Definitions */ @font-face {font-family:GillSans-Bold; panose-1:0 0 0 0 0 0 0 0 0 0; mso-font-charset:178; mso-generic-font-family:auto; mso-font-format:other; mso-font-pitch:auto; mso-font-signature:8193 0Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-33139157833571147752009-06-23T01:56:00.002+03:002009-06-23T02:24:16.045+03:00corrosion protection<!--[if gte mso 9]> Normal 0 false false false MicrosoftInternetExplorer4 <![endif]--><!--[if gte mso 9]> <![endif]--> <!-- /* Font Definitions */ @font-face {font-family:"Monotype Corsiva"; panose-1:3 1 1 1 1 2 1 1 1 1; mso-font-charset:0; mso-generic-font-family:script; mso-font-pitch:variable; mso-font-signature:647 0 0 0 159 0;} /* Style Definitions */ Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-19710746521766328602009-06-18T19:41:00.001+03:002009-06-18T19:41:13.637+03:00Environment Effects3.1 Atmospheric Corrosion Atmospheric corrosion can be defined as the corrosion of materials exposed to air and its pollutants, rather than immersed in a liquid. Atmospheric corrosion can further be classified into dry, damp, and wet categories. This chapter deals only with the damp and wet cases, which are respectively associated with corrosion in the presence of microscopic electrolyte (or “Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-6321121593578222875.post-17250276636833025672009-06-18T18:30:00.001+03:002009-06-18T19:22:55.970+03:00Forms of corrosion2.1 Uniform corrosion or general corrosionas sometimes called, is defined as a type of corrosion attack (deterioration) that is more or less uniformly distributed over the entire exposed surface of a metal (see illustration below). Uniform corrosion also refers to the corrosion that proceeds at approximately the same rate over the exposed metal surface. Uniform attack is the most common form of Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-44720882519653815572009-06-18T16:32:00.002+03:002009-06-18T17:11:09.422+03:00principles of corrosionIntroduction Corrosion is the destructive attack of a material by reaction with its environment. The serious consequences of the corrosion process have become a problem of worldwide significance. In addition to our everyday encounters with this form of degradation, corrosion causes plant shutdowns, waste of valuable resources, loss or contamination of product, reduction in efficiency, costly Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-83585004077442648492009-06-14T02:44:00.003+03:002009-06-14T04:01:08.594+03:00Videos of different types of Hardness TestRockwell hardness testVickers hardness testBrinell automatic hardness testerAnother HRC " In details "Unknownnoreply@blogger.com1tag:blogger.com,1999:blog-6321121593578222875.post-86770548350373432222009-03-12T14:19:00.011+02:002011-07-07T15:22:35.643+02:00Hardness Tests1- Introduction
The fundamentals of the various hardening tests are based on a number of
different arbitrary definitions of hardness.
Some of these definitions are:-
1- Resistance to permanent indentation under static or dynamic loads (Indentation Hardness).
2- Energy absorption under impact loads (portable rebound hardness tester).
3- Resistance to scratching (Scratch Hardness).
4-Unknownnoreply@blogger.com3tag:blogger.com,1999:blog-6321121593578222875.post-20508838185965977822009-02-15T17:40:00.015+02:002009-03-12T14:45:09.772+02:00tension test 3Stress – strain diagram of Copper and copper alloys : -Examples of the tensile stress-strain curves.1- Electrolytic copper.2- Commercial copper.3- Bronze.4- Cold worked copper (or cold drawn copper).Stress – Strain diagrams of some standard steels :The most important strength and ductility of the commercial steels are given as follows:-Stress – Strain diagrams of some standard steels Effect of Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-44309053886481925212009-02-15T13:43:00.008+02:002009-03-12T14:45:30.411+02:00tensile test 2the rest of the tensile test 1Determination of 0.2% proof stress : -Some metallic substance doesn't show any yield point a tension test e.g. hard steel, non-ferrous metals and alloys. In this case the 0.2% proof stress found instead of the yield point. The 0.2% proof stress is defined as stress by which plastic deformation of 0.2% take place.and determined by two methods : -1-By loading and Unknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-84668350286290401662009-02-15T00:29:00.007+02:002009-03-12T14:46:06.676+02:00tensile testA tensile test, also known as tension test, is probably the most fundamental type of mechanical test that can be performed on material to have an idea about the mechanical properties of the materials used in the structural design. Tensile tests are simple, relatively inexpensive, and fully standardized.The main feature of tension test:1- Preparation of tension test specimen.2- The specimen mayUnknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-12592970869555319872009-02-14T22:59:00.003+02:002009-03-12T14:46:31.120+02:00introduction of testingMetals testing is very important to show the various properties of metals and the defectswhich may found in it during production or during its service.Classification of metals testing: 1- Destructive tests. 2- Non-destructive tests. 3- Technological tests. 4- Chemical tests. 5- Electrochemical test (Corrosion test). 6- Metallographic tests.In the following the different classes of materialUnknownnoreply@blogger.com0tag:blogger.com,1999:blog-6321121593578222875.post-12154765810593438752008-10-07T16:43:00.000+02:002009-10-07T16:44:25.373+02:00Terms of ServicesoonUnknownnoreply@blogger.com0