A 10 mm thick En-24 steel yielded a valid plane strain fracture toughness of 80 Mpa √m. The minimum yield strength of the steel is . . . . . . . . MPa.
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Metallurgical Engineering · all questionsPhysical Metallurgy
Physical Metallurgy
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In precipitation hardenable alloy like duralumin, intermediate precipitates can form due to
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Identify the incorrect statement with respect to grain growth.
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Coring is often being removed by subsequent
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During the solidification of a pure metal, it was found that dendrites are formed. Assuming that the liquid-solid interface is at the melting temperature, the temperature from the interface into the liquid
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Creep resistance decreases due to
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What is the eutectic composition in Pb-Sn diagram
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The net effect of continuous cooling on the TTT curves is that the curves are shifted to the
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Substantial amount of bainite can form during continous cooling in
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A 0.2% C steel is equilibriated just above the eutectoid temperature and then quenched in iced brine. The room temperature microstructure will consist of
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The relation between dendrite arm spacing (x) and the solidification time (t) is given by (A and n are constants)
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The hardenability of steels decreases with
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The angle between the line vector and the burgers vector of an edge dislocation is
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Which of the following cooling curves (shown in schematic) in an eutectoid steel will produce 50% bainitic structure?
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At 910°C γ-Fe transforms to α - Fe resulting in a percentage volume expansion of
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The boundary line between (liquid) and (liquid+solid) regions is called
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Metal A nucleates as a spheres in a melt. Assuming Y(liquid/solid surface energy) = 200mJ/m2 and ΔGv (change in volume free energy) = -108 J/M3 the critical radius (in nm) for stable nuclei is
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Two Cu-Ni alloys, one with 47 wt.% Ni and the other with 53 wt.% Ni, are kept in separate crucibles and are allowed to equilibrate at the same-temperature T1 between the liquidus and the solidus. The two alloys have
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Match the following.
| Gruop-I | Gruop-II |
| P. Line defect | 1. Vacancy |
| Q. Point defect | 2. Grain boundary |
| R. Area defect | 3. Voids |
| S. Volume defect | 4. Dislocations |
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The primary strengthening mechanism in 70 : 30 brass is
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