Diffusionless diffusion controlled none of the above The CCT

Diffusionless diffusion controlled none of the above The CCT diagram below, cooling curve C will result in martensite coarse pearlite fine pearlite martensite + pearlite The crystal structure of austenite is fcc bcc bct hcp The limitations of plain carbon steel include low strength limited hardenability formation of perlite both A and B In an aged Al-4% Cu alloy, the GP2 zone is segregation of Cu atoms Coherent precipitates Non-coherent precipitates None of the above

Solution

37(d):Quenching results into hardening of material...so martensite snd pearlite because cooling is done near to critical cooling rate...time rate is very less.

38(a)mass of carbon by percentage is less and temperature at which phase conversion takes place is more than eutectoid temperature. It leads to softening of material leading to FCC structure.