METHOD OF MICROANALYSIS
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Observation and study of microstructures of heat-treated carbon steels at 100 to 500 times magnification.
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Each microstructure is drawn in a circle with a diameter of 50 mm or a square of size 60X60 mm.
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The name of the steel, its chemical composition, processing mode, the name of the structure and its magnification are written below each microstructure image.
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In each microstructure picture, phase types and structural composition are indicated by arrows, and their names are written next to the arrow.
ASSIGNMENT
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Study of the microstructure of annealed, quenched and tempered carbon steels.
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Draw and diagram the studied microstructure scheme
to write explaining how to get them.
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Making a report on the work.
Laboratory procedure:
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The microslide of steel is observed under a microscope and its structures are determined;
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Depending on the structure, the amount of carbon in the steel is determined;
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The observed microstructure is drawn.
Task : Explain the structural changes that occur in steel with x % (the value of x is taken according to the option) carbon content when heated to the liquidus temperature. Give information about the structures observed in this steel and their mechanical properties.
Options
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
|
11
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Amount of C, in %
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0.3
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0.4
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0.5
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0.6
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0.7
|
0.8
|
0.9
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1.0
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1.1
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1.2
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1.3
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Options
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12
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13
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14
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15
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16
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17
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18
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10
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20
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21
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22
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Amount of C, in %
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1.4
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1.5
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1.6
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1.7
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1.8
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1.9
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2.0
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2.1
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0.55
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0.65
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0.85
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The following shall be included in the laboratory report:
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The part of the state diagram of ferro-cementite alloys that applies to steels is drawn;
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The effect of carbon on the structure and mechanical properties of steel is shown;
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The structure and properties of the steel structure are written;
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Class of steel, mechanical properties ( NV , s v , d , a n ) and areas of use are indicated (using table 8.1);
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General conclusions.
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