Material Science

Introduction to the Scanning Electron Microscope (SEM) A scanning electron microscope (SEM) is a type of electron microscope that produces images of a sample by scanning the surface with a focused beam of electrons. The electrons interact with atoms in the sample, producing various signals that contain information about the surface topography and composition of the sample. The electron beam is scanned in a raster scan pattern, and the position of the beam is combined with the intensity of the detected signal to produce an image. In the most common SEM mode, secondary electrons emitted by atoms excited by the electron beam are detected using a secondary electron detector (Everhart–Thornley detector). The number of secondary electrons that can be detected, and thus the signal intensity, depends, among other things, on specimen topography. Some SEMs can achieve resolutions better than 1 nanometer. More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Nondestructive Testing - Magnetic Particle Inspection - Basic principle - Preconditions - Practical Procedure More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Basic principle and practical procedure of the Vickers hardness test - Testing machine, test piece, diamond pyramid indenter - Basic principle, hardness definition and practical procedure value More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Metallography -- Macroscopic Techniques - Preparation of an ingot and a piston: sawing, grinding and etching - Individual grains are visible - Preparation of several steel specimens: flame hardened tooth of a gear wheel, induction hardened cylindrical shaft, induction hardened splined shaft, case hardened tooth of a gear wheel, weld joint - Weld pass structure and heat treated zones and are visible More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Dye Penetrant Inspection - Basic principle - Practical procedure - Pros and cons More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Basic principle and practical procedure of the Brinell hardness test - Testing machine - Test piece - Spherical indenter - Basic principle - Definition of the hardness value More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Basic principle and practical procedure of the Rockwell hardness test - Testing machine, test piece, conical diamond indenter - Basic principle, hardness definition, testing procedure More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Fatigue Test - Problem and practical relevance - Specimen preparation - Test procedure - S-N curve More Material Science Videos https://rumble.com/playlists/QExVxeOAGck

Material Science: Eddy Current Testing More material science videos https://rumble.com/playlists/QExVxeOAGck

Basic principle and practical procedure of the tensile test on ductile metallic materials More material science videos https://rumble.com/playlists/QExVxeOAGck Tensile testing, also known as tension testing, is a fundamental materials science and engineering test in which a sample is subjected to a controlled tension until failure. Properties that are directly measured via a tensile test are ultimate tensile strength, breaking strength, maximum elongation and reduction in area. From these measurements the following properties can also be determined: Young's modulus, Poisson's ratio, yield strength, and strain-hardening characteristics. Uniaxial tensile testing is the most commonly used for obtaining the mechanical characteristics of isotropic materials. Some materials use biaxial tensile testing. The main difference between these testing machines being how load is applied on the materials.