Yield strength, or the yield point, is defined in engineering as the amount of strain that a material can undergo before moving from elastic deformation into plastic deformation. Elastic deformation is spring-like deformation, where a material will return to its original shape. The stress felt by a material given a certain strain is defined by linear relationship, with a slope defined by the modulus of elasticity (E). If too much strain is applied, the material will deform permanently, or plastically. The yield point is often defined, due to the lack of a clear border between the elastic and plastic regions, by a 0.2% offset from the linear region. The point where this offset line intersects the stress-strain curve is the yield point. Engineering applies scientific and technical knowledge to solve human problems. ... In any branch of science dealing with materials and their behaviour, strain is the geometrical expression of deformation caused by the action of stress on a physical body. ... Material is the substance or matter from which something is or can be made, or also items needed for doing or creating something. ... In engineering mechanics, deformation is a change in shape due to an applied force. ... In physics and materials science, plasticity is a property of a material to undergo a non-reversible change of shape in response to an applied force. ... In solid mechanics, Youngs modulus (also known as the modulus of elasticity or elastic modulus) is a measure of the Stiffness of a given material. ...
An ultralow yieldstrength steel consisting of: from 0.01 to 0.25 wt % of hexagonal boron nitride particles having an average diameter of from 1 to 30.mu.m; and the balance consisting of iron and unavoidable impurities.
The present inventors have found that the yieldstrength of a steel is lowered by dispersion of hexagonal boron nitride particles in the steel and invented the steels defined in (1), (2) and (3) as follows.
This stress concentration generates a raised stress greater than the yieldstrength of the matrix iron, so that the iron matrix subjected to this raised local stress begins to deform in a shear manner even when the applied nominal stress is smaller than the yieldstrength of the matrix iron.
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