metallurgy exam review
First alloy made?
Bronze. A combination of copper and tin
Was titanium used by early humans?
No. They had no clue what it was.
Bronze is an alloy of copper and tin
yes
Ability to bend without break is an example of?
Ductility. More ductility means the more something can bend without breaking.
Annealing- what is it?
It is a heat treatment process used to alter the physical and sometimes chemical properties of a material. It involves heating the material to a specific temperature and gradually cooling it. This can relieve internal stresses, increase ductility, and improve the overall structure and hardness of the material.
Smallest part of a compound that has properties of that compound
Molecule
What material is more expensive- why?
Gold because there’s less of it, making it more valuable.
Smallest part of element
atoms
Nondestructive testing- what is it?
A testing method used to inspect, test or evaluate materials, components, or assemblies without causing damage
What is HAZ?
Heat affected zone. The portion of a material that experiences changes in its microstructure and mechanical properties due to its exposure to heat.
3 types of nondestructive testing
Ultrasonic testing: uses high frequency sound waves to detect internal flaws, measure thickness, and assess material properties without causing damage.
Radiographic testing: uses X-rays or gamma rays to inspect the internal structure of materials, revealing hidden defects or irregularities.
Magnetic particle testing: detects surface and near surface flaws in ferrous materials by applying a magnetic field and using iron particles to highlight defects.
Dye penetrant testing: used to detect surface breaking defects in materials by cleaning, applying the liquid (dye), allowing time so the penetrate is given time to soak in, wiping extra dye off so see defects.
Fastest quench methods
Depending on material and desired properties water quenching, oil quenching, and accelerated cooling using air jets or liquid nitrogen bath.
3 types of destructive testing
Tensile testing: involves applying a tensile (pulling) force to a material sample to measure its strength and deformation properties.
Impact testing: assesses a material’s toughness by subjecting it to a sudden force, usually through a swinging pendulum, and measuring the energy absorbed during fracture
Hardness testing: measures a material’s resistance to indentation or scratching, providing insight into its strength and wear resistance. Common methods are Rockwell, Brinell, and Vickers hardness tests.
Ferrous and nonferrous- difference?
Ferrous materials: Contains iron. Common ferrous metals include steel and cast iron. They often have magnetic properties and are susceptible to rust.
Nonferrous materials: Does Not contain iron. Examples include aluminum, brass, copper, and lead. Are generally non magnetic and more resistant to corrosion.
The difference between the two is one contains iron and the other doesn’t, impacting factors such as strength, corrosion resistance, and magnetic behavior