Course Solutions Uncategorized (Solved) : 2 Rod Diameter 25 Mm Made Eutectoid Steel Rod Austenitized 900 C Quenched Oil Metallograph Q33096013 . . . .

(Solved) : 2 Rod Diameter 25 Mm Made Eutectoid Steel Rod Austenitized 900 C Quenched Oil Metallograph Q33096013 . . . .

 

2. A rod with diameter 25 mm is made of eutectoid steel, The rod is austenitized at 900°C and quenched in oil. The metallographic investigation revealed that the structure consists of martensite, bainite and pearlite. (a) Draw a schematic of the cross section of the rod and note where do you expect these phases to form (b) Draw the expected hardness profile from the rod surface to the rod center. (c) The rod is subjected to a tempering treatment at 500°C for 1 hour. Draw the new hardness profile and compare it with question (b) above. (d) What heat treatment could convert the rod to 100% pearlite? (e) Suppose that the rod, in addition to carbon, contains 2Mn and i Cr (wt%). The rod is austenitized at 900°C and is oil quenched. What basic difference will be observed from the metallographic investigation?

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