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Engineering Materials

Engineering Materials
Large forgings, crank shafts, axles normally contain carbon up to

0.05 to 0.20%
0.45 to 0.55%
0.20 to 0.45%
0.55 to 1.0%

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Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 80
RC 65
RC 48
RC 57

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Engineering Materials
Weld decay is the phenomenon found with

Cast iron
Mild steel
Stainless steel
Nonferrous materials

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Engineering Materials
Cast iron is characterized by minimum of following percentage of carbon

0.008
0.02
0.013
0.002

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Engineering Materials
When medium carbon steel is heated to coarsening temperature

The average grain size is a minimum
There is no change in grain size
The grain size increases very rapidly
The grain size first increases and then decreases very rapidly

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Engineering Materials
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

1050°C
770°C
910°C
Below recrystallization temperature

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