5
what is "Admixture"
the action of adding or mixing something in order to improve its properties
PG16
what is "Age soften"
a spontaneous decrease of strength and hardness that takes place at room temperature
PG16
what is "alloy"
a material with metallic properties that is composed of two or more elements one of which is metal
PG 16
what is "Angular distortion"
distortion transverse to the welding direction caused by shrinkage near the weld zone resulting in a change in angle of the parts
PG16
what is "Austenite"
a solution of one or more elements in the face centered cubic (FCC) structure of iron
PG 16
what is "body-centred cubic (BCC)"
A regular pattern of atoms arranged in a cubic shape with atoms located at each corner of the cube and an additional atom located at the centre of the cube
PG 16
what is "Brittleness"
the property of a material that fractures when subjected to stress with little tendency to deform before rupture
PG 16
what is "Cementite"
an iron carbide phase in steel that is comprised of three iron atoms and one carbon atom and appears as small hard particles or layers in the microstructure and is brittle in nature
PG 16
what is "Coke"
the residue left from the distillation (heating without air) of coal which is used as fuel in the steelmaking process to remove oxygen and provide the heat source for the breakdown of the iron ore
PG 16
what is "Cold rolling"
a process used in steelmaking that reduces the thickness of an ingot billet or slab by using pressure without the addition of heat to the material being rolled. The temperature of rolling is considered to be room temperature
PG16
what is "Compression"
a reduction in volume by being forced together into less space
PG 16
what is "contraction"
to become reduced in size; to pull together, shrink or wrinkle
PG 16
what is "Curie point"(770 °C, 1418 °F)
the temperature at which ferromagnetic materials can no longer be magnetized, and when they lose their residual magnetism (paramagnetic)
PG16
what is "Crystalline structure"
an arrangement of atoms in a rectangular 3D pattern such as body-centred cubic (BCC) or face-centred cubic (FCC)
PG 16
what is "Density" (physical property)
the mass per unit volume of a substance under specified standard conditions of pressure and temperature
PG 16
what is "Deoxidation"
the addition of an element such as manganese, aluminum, or silicon to molten steel to reduce the amount of oxygen to below 0.2%
PG 17
what is "diffusion"
the rearrangement of the atoms inside the crystal (lattice) structure of a metal (shifting to new locations within a material). diffusion is controlled by the rate at which these atoms change positions
PG 17
what is "Dilution"
the change in composition of the weld metal caused by the mixing of the base metal or the previously deposited weld metal
PG 17
what is "Distortion"
the act of deforming a physical change in shape by bending twisting or warping
PG 17
what is "Elastic/elasticity(mechanical property)"
the ability of a material to deform in a non-permanent way. A perfect elastic material recovers its original shape and dimensions after the release of stress
PG17
what is "The location at which three solid phases co-exist. in the iron-carbon phase diagram this point indicates a temp of (723C/1333F and a carbon content of 0.8%" called
Euctoid Point PG 17
what is "a point on a phase diagram where a liquid will solidify to form two new phases simultaneously when cooled" called
Eutectic point
PG 17
what is "The ability of a material to melt and amalgamate or join with other materials when an external heat source is applied to it"
Fusible
PG 17
what is "A terracelike fracture in the base material that is oriented parallel to the wrought surface. this fracture of a steel in a fabricated component is the result of stress placed on the steel perpendicular to the direction of rolling (tension in the through thickness direction) these forces cause the separation of elongated inclusions from the rolling process." called
Lamellar tearing
PG 18
what is "a mineral substance (opaque and fusible that can be formed and is capable of conducting heat and electricity" called
Metal
PG 18