П. Answer the questions to the text.

1. What is quenching?

2. What does this process make?

3. What do tempering temperatures depend on?

4. What do higher temperatures give?

5. What is annealing?

III. Match the sides.

1) quenching а) охлаждение метала

2) small grains structure b) состав стали

3) composition of steel c) температура нормализации

4) cooling the metal d) мелкозернистая структура

5) tempering temperatures e) закалка охлаждение

IV. Make up the sentences.

1. heat, treatment, is, quenching

2. to, is, tempering, applied, steel

3. the most, industry, is, important, in, metal, steel

4. strength, manganese, extra, gives

5. are, steels, of, carbon, low, content, ductile

V. Choose the right variant.

1 ) I'm sure we our visit to mis plant

A will enjoy

B are going to enjoy

C enjoy

2) He usually articles from English into Russian.

A will translate B translates C is translating

3) The 22^nd of December is day in the year.

A the short B the shorter C the shortest

4) His parents in Moscow in 1996/

A were living B lived Clive

5) In Kiev this exhibition two years ago.

A are held

B was held

C are being held

МИНИСТЕРСТВО ОБРАЗОВАНИЯ И НАУКИ

ДОНЕЦКОЙ НАРОДНОЙ РЕСПУБЛИКИ ГОСУДАРСТВЕННОЕ

ПРОФЕССИОНАЛЬНОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ

«ХАРЦЫЗСКИЙ ТЕХНОЛОГИЧЕСКИЙ ТЕХНИКУМ»

ГОСУДАРСТВЕННОГО ОБРАЗОВАТЕЛЬНОГО УЧРЕЖДЕНИЯ

ВЫСШЕГО ПРОФЕССИОНАЛЬНОГО ОБРАЗОВАНИЯ

«ДОНЕЦКИЙ НАЦИОНАЛЬНЫЙ ТЕХНИЧЕСКИЙ УНИВЕРСИТЕТ»

Variant№5

I . Read and translate the text

Hot Working of Steels

An important feature of hot working is that it provides the improvement of mechanical properties of metals. Hot-working (hot-rolling or hot-forging) eliminates porosity, directionality and segregation that usually, present in metals. Hot-worked products have better ductility and toughness than the unworked casting. During the forging of a bar, the grains of the metal become greatly elongated in the direction of flow.

The ability of metal to resist thinning and fracture during cold-working operations plays an important role in alloy selection.

Fracture of the workpiece during forming can result from inner flaws in the metal. These flaws often consist of nonmetallic inclusions such as oxides or sulfides that are trapped in the metal during refining. Such inclusions can be avoided by proper manufacturing procedures.

The ability if different metals to undergo strain varies. The change of the shape after one forming operation is often limited by the tensile ductility of the metal.

П. Answer the questions to the text.

1. What is an important feature of hot working?

2. What do hot-working, hot-rolling and hot-forging eliminate?

3. What does play an important role in alloy selection?

4. What do these flaws consist of?

5. What is the chance of the shape often limited by?

III. Match the sides.

1. an important feature of hot

working а) зерна металла

2. improvement of mechanical

properties of metals b) хорошая ковка

3. to resist thinning and fracture c) важная черта горячей обработки

4. good forging d) улучшение механических свойств металлов

5. grains of the metal е) противостоять утончению и трещине

IV, Make up the sentences,

1. Treatment, heat, the nature, of, controls, the grains

2. Hammering, by, can, by, all, formed, metals

3. Are, irregular, called, grains, crystals

4. In, used, industry, widely, are, most, metals

5. Metallury, is, of, metals, the production, the study, of

V. Choose the right variant

1)He school in 1998

A finishes B finished C are finishing

2)The students the article now

A is translating B translated C are translating

3)This contract yesterday

A will be signed B was signed C is signed

4)When I entered the room he a letter

A is writing B was writing C will write

5)The problem was we expected

A seriouser than B more serious than C serious

МИНИСТЕРСТВО ОБРАЗОВАНИЯ И НАУКИ

ДОНЕЦКОЙ НАРОДНОЙ РЕСПУБЛИКИ ГОСУДАРСТВЕННОЕ

ПРОФЕССИОНАЛЬНОЕ ОБРАЗОВАТЕЛЬНОЕ УЧРЕЖДЕНИЕ

«ХАРЦЫЗСКИЙ ТЕХНОЛОГИЧЕСКИЙ ТЕХНИКУМ»

ГОСУДАРСТВЕННОГО ОБРАЗОВАТЕЛЬНОГО УЧРЕЖДЕНИЯ

ВЫСШЕГО ПРОФЕССИОНАЛЬНОГО ОБРАЗОВАНИЯ

«ДОНЕЦКИЙ НАЦИОНАЛЬНЫЙ ТЕХНИЧЕСКИЙ УНИВЕРСИТЕТ»

Variant №6

I. Read and translate the text.

Metals

Mankind has used metals for centuries in gradually increasing quantities but only now they are employed in really great quantities. Today we know more than seventy metals, the majority of which are used in industry. Of all the metals iron is the most important one. Absolutely pure iron is never prepared except for laboratory purposes. The irons and steels in use today are really alloys of iron, carbon and other substances. They can be made elastic, tough, hard, or comparatively soft. Mechanical properties of metals are the result of their atomic structure. They include hardness, ductility and malleability which are of special importance in engineering. Ductility is the capacity of metal to be permanently deformed in tension without breaking. Malleability is the capacity of metal to be permanently deformed by compression without rupture.

IL Answer the questions to the text.

1. How many metals do we know today?

2. What is the most important one?

3. What do mechanical properties include?

4. What is ductility?

5. What is malleability?

III. Match the sides.

1. Alloy а) ковкость

2. malleability b) сжатия

3. ductility c) прочность

4. твердость d) растяжение

5. compression e) виплав

IV. Make up the sentences.

1. Is, metal, an important, iron, now.

2. Used, is, steel, many, in, of, industry, branches.

3. Consist, alloys, of, cast, steel, and, iron.

4. Can, metals, corrosion, undergo.

5. Are, there, important, metals, several of, groups.

V. Choose the right variant

1) She will go to the University when she her paper.

A will finish

B finishes

C will be finishing

2) I the letter long before you phoned.

A received B had received C was receiving

3) He the essay for his classes in come days.

A will be completing

B will complete

C will have completed

4) Yesterday it all day long.

A rained B had rained C was raining

5) His brother just his leg.

A has broken Bis breaking C breaks