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Q6: Using the figure below, determine the most likely heat treatment duration that maximizes the tensile strength during precipitate hardening for samples at 550K

Q6: Using the figure below, determine the most likely heat treatment duration that maximizes the tensile strength during precipitate hardening for samples at 550K and 375K. Explain why the heat treatment time changes as a function of temperature. Tensile strength (MPa) 500 400 300 1 h 1 day 1 month 1 year 1 min 260C (500F) 200 0 10-2 10-1 1 10 121C (250F) 70 10 60 60 50 Tensile strength (ksi) 149C (300F) 50 40 204C 40 (400F) 30 102 103 104 Duration of precipitation heat treatment (h)

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