Test designed to determine the resistance of metal to breakage by impact, usually by concentrating the applied stress to a notched specimen.
Particles of impurities [usually oxides, sulfides, silicates, etc.) that are held mechanically or are formed during the solidification or by subsequent reaction within the solid metal.
The resistance of a material to indentation. This is the usual type of hardness test, in which a pointed or rounded indenter is pressed into a surface under a substantially static load.
A process of hardening a ferrous alloy by heating it above the transformation range by means of electrical induction, and then cooling as required.
A substance which retards some specific chemical reaction. Pickling inhibitors retard the dissolution of metal without hindering the removal of scale from steel.
The placing of a sheet of paper between two adjacent layers of metal to facilitate handling and shearing of rectangular sheets, or to prevent sticking or scratching.
An annealing treatment given to wrought metals following cold work hardening for the purpose of softness prior to further cold working. (See Process Annealing.)
The aging of an alloy at two or more temperatures by steps, and cooling to room temperatures after each step. Compare with progressive aging.
(Chemical Symbol Fe.) Element No. 26 of the periodic system; Atomic weight 55.85. A magnetic silver-white metal of high tensile strength ductile and malleable. Melting point of pure iron about 2795?F. Chemically iron is chiefly base forming. The principal forms of commercial iron are steel, cast iron and wrought iron.
Thinning the walls of deep drawn articles by reducing the clearance between punch and die.
A process on which a ferrous alloy is heated to produce a structure partly or wholly austenitic, and is then cooled to and held at a temperature that causes transformation of the austenite to a relatively soft ferrite-carbide aggregate.