Question

A cutting tool made of 0.5 wt% carbon steel is in the annealed, soft condition and needs to be hardened to 62 HRC. Using the TTT diagram given below, design an experiment involving a heat treatment procedure, which could be used to achieve this. What treatment could be used to improve the ductility and toughness of this steel, and describe a "non-destructive" testing method that could be used to monitor changes in these properties. Sketch a graph that could be used to show the effect of this treatment on mechanical property changes. [10] Temperature (°C) 900 800 - A3 ? + ? 700 - A1 Ps Fs 600 Pf ? + pearlite ? 23 500 ? + ? + pearlite 30 Bf 400 Bs ? + bainite Bainite 39 Ms 300 Mf ? + martensite 49 Rockwell C hardness 200 Martensite 100 62 0 0.1 1 10 10² 10³ 10? 10? 10? Time (s) TTT curve for carbon steel AISI 1050

          A cutting tool made of 0.5 wt% carbon steel is in the annealed, soft condition and needs to be hardened to 62 HRC. Using the TTT diagram given below, design an experiment involving a heat treatment procedure, which could be used to achieve this.

What treatment could be used to improve the ductility and toughness of this steel, and describe a "non-destructive" testing method that could be used to monitor changes in these properties.

Sketch a graph that could be used to show the effect of this treatment on mechanical property changes. [10]

Temperature (°C)
900
800 - A3
? + ?
700 - A1 Ps
Fs
600 Pf
? + pearlite
?
23
500 ? + ? + pearlite
30
Bf
400 Bs
? + bainite
Bainite
39
Ms
300 Mf
? + martensite
49
Rockwell C hardness
200
Martensite
100
62
0
0.1 1 10 10² 10³ 10? 10? 10?
Time (s)
TTT curve for carbon steel AISI 1050

A cutting tool made of 0.5 wt% carbon steel is in the annealed, soft condition and needs to be hardened to 62 HRC. Using the TTT diagram given below, design an experiment involving a heat treatment procedure, which could be used to achieve this.

What treatment could be used to improve the ductility and toughness of this steel, and describe a "non-destructive" testing method that could be used to monitor changes in these properties.

Sketch a graph that could be used to show the effect of this treatment on mechanical property changes. [10]

Temperature (°C)
900
800 - A3
? + ?
700 - A1 Ps
Fs
600 Pf
? + pearlite
?
23
500 ? + ? + pearlite
30
Bf
400 Bs
? + bainite
Bainite
39
Ms
300 Mf
? + martensite
49
Rockwell C hardness
200
Martensite
100
62
0
0.1 1 10 10² 10³ 10? 10? 10?
Time (s)
TTT curve for carbon steel AISI 1050

Added by Kathryn T.

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