Question 1 using the nimate gure oss. the isothermal transformation diagram for

Question

Question 1 using the nimate gure oss. the isothermal transformation diagram for a 0.45 wt% C steel alloy, specify the nature of the final microstructure in terms of the microconstituents present of a small specimen that has been subjected to the following temperature treatments. In each case assume that the specimen begins at 845 °C and that it has been held at this temperature long enough to haveI achieved a complete and homogeneous austenitic structure. ? References. Google Chrome ? Secure References a) Rapidly cool to 250 degrees C, hold for 1000 s, then quench to room temperature https://edugenwileyplus com edugen/player/references indexu nit odeshelp8xínkobject b) Rapidly cool to 625 degrees C, hold for 1 s, then quench to room temperature. 900 Click if you would like to Show Work for this question: Qpen Show Work ALF By accessing this Question Assistance, you will learn while you earn points based on the Poi 600 100

Explanation / Answer

a) At this case 100% martensite is formed. It is hardest of all micro constituent present. It is having a body centred tetragonal(bct) structure. It is formed by quenching/sudden cooling.

b) By rapidly cooling to 625 o C and holding for 1s, about 40% of coarse pearlite is formed. It is then quenched to room temperature, passing through martensite region of formation, the remaining 60%if austenite transforms into martensite. So a 40%pearlite-60%martensite is formed

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