Answer:
answer is given below
Step-by-step explanation:
given data
temperature T1 = 700°C
temperature T2 = 960°C
solution
first at temperature 700°C
proeutectoid ferrite + pearlite on cooling there is no Martensite (proeutectoid ferrite + pearlite)
and
at temperature 960°C
austenite on rapid cooling is formed Martensite in carbon steels
so that
on sudden quenching alot point defect arrest and Martensite is form due to the shear mechanism and this create a lot of dislocation
so that here harness is very high on this condition