For a eutectoid steel, describe isothermal heat treatments that would be required to yield specimens having...

For a eutectoid steel, describe isothermal heat treatments that would be required to yield specimens having the following tensile strength-ductility (%RA) combinations:

(a) 900MPa and 30% RA

(b) 700MPa and 25% RA

Expert Solution

This problem asks for us to specify isothermal heat treatments to yield two tensile strength-ductility combinations.

(a) For this portion of the problem the required tensile strength is 900 MPa and the ductility is 30%RA. Because the heat treatment is to be isothermal and alloy is one of eutectoid composition, we use Figures 10.31a and 10.31b. From Figure 10.31a, in order to achieve a tensile strength of 900 MPa the isothermal heat treatment must be conducted at about 660°C. On the other hand, for a ductility of 30%RA, the heat treatment temperature is also 660°C, as indicated in Figure 10.31b.

(b) For this portion of the problem, the tensile strength-ductility combination is 700 MPa and 25%RA. For a tensile strength of 700 MPa, the heat treatment temperature is 690°C (Figure 10.31a). And, using Figure 10.31ban isothermal heat treatment also at about 690°C is required.

samet mamat answered 2 years ago

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