Metallurgy and Heat Treatment - Multiple Choice Questions and Answer

Metallurgy and Heat Treatment - Multiple Choice Questions and Answer Points : Metallurgy and Heat Treatment, mcqs, evaluation, objective type question and answer, multiple choice questions and answer, Introduction to Metallurgy, Natural Occurrence, Treatment of Ores, Production Process, Refractory Materials, Pre-Smelting Treatment of Ores, The Smelting Operation (Blast Furnace), Manufacture of Wrought Iron, Types of Steel, Steel Manufacturing Process, Electric Arc Furnace, Industrial Shaping of Metals, Iron Carbide Diagram, Heat Treatment Equipment, Heat Treatment and Process Introduction to Metallurgy 1. Metallurgy encompasses
(a) Extractive metallurgy
(b) Physical metallurgy
(c) Both extractive and physical metallurgy
(d) None of these

2. The substance for which the ore is mined is called
(a) Gangue
(b) Constraint
(c) Value
(d) Oxide

3. The amount of iron in the earth crust is
(a) 0.5%
(b) 50%
(c) 8.1%
(d) 5%

Mechanical Properties of Metals

Mechanical Properties of Metals Points : Mechanical Properties of Metals, Hardness, Toughness or (tenacity), Ductility, Malleability, Brittleness, Elasticity, Plasticity, Stiffness, Fatigue, Creep, 1. Hardness
2. Toughness or (tenacity)
3. Ductility
4. Malleability

Constituents of Steel

Constituents of Steel Points : Constituents of Steel, Ferrite, Cementite, Pearlite, Martensite, Austenite, Troostite, Sorbite The different microscopic constituents of iron and steels are as follows:
1. Ferrite
2. Cementite
3. Pearlite
4. Martensite

Full Annealing

Full Annealing Points : Full Annealing, Definition Definition If it is desired to reline the grain structure and produce a lamellar partite, a full annealing cycle should be used. This consists of heating the steel to a temperature above the transformation range, holding for one to two hours, and then cooling at a predetermined rate to obtain the desired microstructure.

Isothermal Annealing

Isothermal Annealing Points : Isothermal Annealing, Definition Definition It is a type of full annealing in which the steel first is cooled to the temperature at which it is desired to have transformation occur, at a rate sufficiently rapid to prevent any structural change above that temperature.

Sub Critical Annealing

Process or Sub Critical Annealing Points : Process or Sub Critical Annealing, Definition Definition Another type of annealing called process or sub critical annealing consists of heating the steel to a temperature first under lower critical point and holding at this temperature for the proper time, (usually 2 to 4 hours) followed by air cooling.

Spheraidisation

Spheraidisation Points : Spheraidisation, Definition Definition It is a type of annealing which causes practically all carbides in the steel to agglomerate in the form of small gobules or spheroids. There may be wide range of hardness with such a structure for any grade of steel since the size of the globules has a direct relation to hardness.

Diffusion Annealing

Diffusion Annealing Points : Diffusion Annealing, Definition Definition This process, also known as homogenizing annealing, is employed to remove any structural hon-uniformity. Dendrites, columns grains and chemical in homogeneities are generally observed in the case of Ingots, heavy plain carbon steel casting, and high alloy steel castings.