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Unformatted text preview: compressive load P. Compute: a) the true and engineering strains. Which one is bigger? True strains b) the true and engineering stresses. Which one is bigger? Engineering stress III) The following engineering stressstrain plot was obtained for a plaincarbon steel. Compute the yield point at a strain offset of 0.2 % (11 points) Answer: 67000 psi Question 3: (38 points) I) A hypoeutectoid plaincarbon steel contains 17% of proeutectoid ferrite at temperature just slightly above 723 C. Calculate the amount of pearlite in the steel at a temperature just slightly below 723 C. (15 points) Answer: 83% II) A hypereutectoid steel contains 96.59% eutectoid ferrite. What is the average carbon content? (15 points) Answer: 0.91% Carbon III) A 1.5%C hypereutectoid plaincarbon steel is slowly cooled from 950 C to a temperature just slightly above 723 C. Calculate the weight percent proeutectoid cementite in this steel. (8 points) Answer: 11.93%...
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 Spring '09
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