There are several processes that will increase yield and ultimate strength at the cost of reducing ductility of steel. Which of the following processes is expected to achieve this. (There could be more than one answer.)

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Annealed the material. i.e. heat till around 500"C~650"C and hold for several hours until the crystal reform and grow, forming large crystals.

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Cold working or work hardening the material by introducing permanent deformation at room temperature.

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Heat up workpiece till forging temperature (950"C~1250"C) and hold long enough till material converts to austenite and then quench (cool rapidly) in oil or water.

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Decrease the crystal grain size via forging or hot rolling.

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Age  the material by storing in a cool dry cellar for several months.

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There are several processes that will increase yield and ultimate strength at t...

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