Which microstructure is spheroidite?

What is the approximate Brinell Hardness Number for a specimen of a eutectoid iron-carbon alloy (0.76 wt% C) that is first completely transformed to austenite, then cooled to room temperature at 160 oC/s cooling rate (see the attached figures)?

Rank the following iron-carbon alloys and associated microstructures from the softest to the hardest:I. 0.25 wt% C with coarse pearliteII. 0.80 wt% C with BainiteIII. 0.25 wt% C with spheroiditeIV. 0.80 wt% C with fine pearlite

Use the TTT diagram below and assume that the initial temperature is 760 ˚C What is the nature of the microstructure, in terms of 1) microconstituents present and 2) approximate percentages of the microconstituents when the specimen is rapidly cooled to 450°C, held for 10 seconds, and then quenched to room temperature?

What is the composition of an iron–carbon alloy for which the fraction of total ferrite is 0.86?

Consider a metal single crystal oriented such that the normal to the slip plane and the slip direction are at angles of 32.5° and 50°, respectively, with the tensile axis. If the critical resolved shear stress is 15 MPa, will an applied stress of 30 MPa cause the single crystal to yield? What is the value of the resolved shear stress?

Consider 0.5 kg of austenite containing 0.85 wt% C, cooled to below 727˚C.  What is the proeutectoid phase?

What is the composition of the eutectic beta phase just below the eutectic temperature (see Pb-Sn Phase Diagram)?

Materials that have high tensile strengths also tend to be ductile.

Dislocations move with the same degree of ease on all the crystallographic planes of atoms and in all the crystallographic directions.