Предмет: География, автор: rabota0875

растения с желтых страниц красной книги

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Автор ответа: Лилия11111111

1

белые медведи, розовый
фламинго, розовая чайка, джейран

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Mechanical Properties of Metals.

All metals possess certain mechanical properties. It is necessary to study them because later, when discussing treatment, we shall see how great is the influence of treatment on those properties.

Brittleness is the property of breaking without much permanent distortion. It may be due to brittleness of the grain boundaries or of the crystals themselves. Cast iron is brittle because its structure is split up by flakes of graphite which is a brittle material. Brittleness is often referred to as shortness. Hot-or red-shortness in steel is when it is brittle in the red-hot state. It is caused by too much sulpher, which is present as iron sulphide and forms a brittle membrane surrounding the steel crystals. Cold-shortness means that a metal is brittle when cold. In steel cold-shortness is produced when the phosphorous content is too high.

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