Question 3 10 points Save Answer Onc finds a diagram of steel below, based on wh

Question

Question 3 10 points Save Answer Onc finds a diagram of steel below, based on which he designs a manufacturing process Stop one: heat the stoel to 800°C, keep at this temperature for long enough time to reach equilibrium; Step two sat bath at 600 C for 5 seconds: Stop : qucnch to room temperature. What type of steel he would make? A A Austente (stable) Eutectoid temperature 1200 Coarse pearlite RIC 15 P.Pearlite P Medium pearlite RIC 30 Fine pearlite R/C 4D Upper or feathery bainte RIC 40 1000 Temperature (CI B-Bainite Ending Lower or acicular bainite RIC 60 Temperature? 300 Austenite unstable Beginning Mo M50 M+AMA 50% 50% Mo M190%). 100 M-Martensite RIC 64 10 1 1 10 102 103 104 105 Isothermal - Transformation Diagram for a 1080 Eutectoid Steel austerite. micture of autent and parte O mixture of austerile and barile. medium pearlhe – 4 Click Submit to complete this assessment. « Question 3 of 3

Explanation / Answer

Answer is mixture of austenite and pearlite.

At 800 degree Celsius it is fully austenure. Now it is brought to 600 oC for 5s, there by transforming aboutv40 % of austenite to pearlite. Now on rapid cooling to room temperature the remaining austenite has to transform into martensite. But in option it is not given Hence option 3 is the best choice.

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