EXP 2 - laboratory experiment report ferrous PDF

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laboratory experiment report ferrous...

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COURSE:

MATS-1021

COURSE NAME:

FERROUS METALLURGY

SECTION NUMBER:

05

EXPERIMENT NO:

2

TITLE:

MICROSTRUCTURE OF HOT ROLLED STEEL

NAME:

PARTH PATEL

STUDENT NUMBER:

0815754

CLASS:

PEM-E

SUBMISSION DATE:

27/02/17

Metallography Metallography and Phase High-strength Low-alloy Steel (0.2% C) Specim Transverse Section % nital. Pearlite Ferrite Magni Phase Identification:50% ferrite and 50

Identification

of

Longitudinal Section

QUESTIONS STEEL DESIGNATION

COLD/HOT ROLLED

% ELONGATION BRINELL %CARBON in 50 mm (2 in) HARDNESS (HB) CONTENT

1008

HOT ROLLED

30

86

COLD ROLLED

20

95

HOT ROLLED

25

116

COLD ROLLED

15

126

HOT ROLLED

20

137

1018

1030

0.10

0.15-.20

0.27-0.40

1040

COLD ROLLED

12

149

HOT ROLLED

18

149

COLD ROLLED

12

170

0.37-0.44

Table: % Elongation and Brinell hardness for hot rolled and cold rolled steel

Graph for microstructure by Hot Rolled Process 35

160 149

30 30

137

25

116

20

20

140

120

86

18 80

15 60 10 40 5

0 0.1 1008

20

0.27 1030

0.2 1018

% Carbon % carbon

%elongation

Brinell Hardness

We observe that as carbon content increases, %elongation decreases while Brinell Hardness increases.

0.37 0 1040

BHN

% Elongation

100 20

Graph for microstructure by cold rolled process 180 170 160

25

149

20 20

140 126 15

15

100

95 12

12 80

BHN

% Elongation

120

10 60 40

5

20 0 0.1 1008

0.27 1030

0.2 1018

0.37 0 1040

% Carbon % carbon

%elongation

Brinell hardness

We observe that as carbon content increases, %elongation decreases while Brinell Hardness increases.

Hot and Rolled steel 450

160 149

400

170

137

140

149 350

120

300 250 126

80

116 200

60 150 100 18 20 20 5030

40

95

86 12 15 12 20

20 0.3 0.18 0.4 0.1

0

Axis Title 1008

1018

1040

1030

0.3 0.18 0.4 0.1

0

BHN

%Elongation

100

Conclusion: By performing experiment: By performing this experiment and watching it under the microscope we observe that the microstructure in both the views (Longitudinal and Transverse) are same and doesn’t show much difference visible to eyes at 400×. However, by further study through different sources I have learnt that there is little difference in the micro-structure.

By study of Graphs: By studying the table and graph for four different steels (1008, 1018, 1030, 1040) we observe that as carbon content increases for the microstructure of hot rolled process, %Elongation decreases while Brinell hardness increases. Same is the case with microstructure of cold rolled process, as the carbon content increases, %Elongation decreases while Brinell hardness increases. But the % increase in brinell hardness shown by microstructure due to cold rolled process is more than the microstructure due to hot rolled process.

REFERENCES 1) ASM handbook (1990) Published by ASM International Handbook Committee Table number: 09 Page number: 262

2) Carbon Steel Product Guide. (n.d.). Retrieved September 29, 2016, from https://alcobrametals.com/guides/carbon-steel#1018...