Which of the following manufacturing processes is not used for producing fine grained metals?
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Metallurgical Engineering · all questionsPhysical Metallurgy
Physical Metallurgy
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In the eutectoid steel, which one of the following structures does not form during continuous cooling?
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Spheroidal graphite is obtained incast irons by
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Martensite in steels is
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Match the desired mechanical properties listed in Group I with the microstructural features listed in Group II.
| Group I | Group II |
| P. Creep resistance | 1. Fine grained two-phase microstructure |
| Q. Elastic modulus enhancement | 2. Single crystal |
| R. Superplasticity | 3. Coherent precipitates |
| S. Increased strength | 4. Glass fibres in epoxy |
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Other parameters remammg same, the recrystallisation temperature of an alloy is lowered, when
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Match the following.
| Group-I | Group-II |
| P. Hardness of martensite in steels | 1. Extent of cold working |
| Q. Hardness of pearlite in steels | 2. Particle size of the resulting carbide |
| R. Hardness of tempered martensite in steels | 3. Interlamellar spacing |
| S. Hardness of α° brasses | 4. Weight per cent of carbon |
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Driving force for grain growth after completion of recrystallisation is
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In an Ellingham diagram, the standard free energy change ΔG° for the oxidation reaction of a metal M given by : xM(s) + O2(g) ⟶ MxO2(s), is plotted as a function of temperature. The slope of this line is positive because
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Example/examples of eutectoid system is/are
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If d is the inter-planar spacing of the planes {h k I}, the inter-planar spacing of the planes {nh nk nl}, n being an interger, is
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Which one of the following elements is an austenite stabilizer?
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In the Ellingham diagram for oxides, C-CO line cuts the M-MO line at temperature T1 and the M'-M'O line at a higher temperature T2. At a temperature greater than T1 and less than T2, carbon can reduce
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Match the microstructural state of the following steels with. their respective heat treatments
| Group-I | Group-II |
| P. Eutectoid steel homogenised at 900°C and quenched in water at room temperature | 1. Ferrite, martensite and retained austenite |
| Q. A 0.4% C steel soaked at 750°C and quenched in water at room temperature. | 2. Pearlite and carbide |
| R. Normalised 1%C steel. | 3. Martensite and retained austenite |
| S. Eutectoid steel subjected to normalising | 4. Pearlite |
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For the same volume fraction, size and size distribution of precipitates, the highest strength in a precipitation-hardened material is obtained when the precipitates are
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In the homogenous nucleation, as compared to heterogeneous nucleation
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Choose the correct statements.
P. Interstitial atoms diffuse slower than substitutional atoms
Q. In pure metals the vacancy concentration increases with temperature
R. Martensitic transformation is athermal in nature
S. Atoms in the grain boundary diffuse slower than in the bulk at relatively lower temperatures.
P. Interstitial atoms diffuse slower than substitutional atoms
Q. In pure metals the vacancy concentration increases with temperature
R. Martensitic transformation is athermal in nature
S. Atoms in the grain boundary diffuse slower than in the bulk at relatively lower temperatures.
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During load Vs load-line displacement measurement for the determination of J10 conipliance is measured at intervals to estimate
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A defect that is bounded by two mirror planes is
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Q100
Open questionThe growth rate of pearlite, v, and the interlamellar spacing S are given by the following relation, where Sc is the critical spacing at which the growth rate is zero and k is a materials constant. The actual interlamellar spacing observed will correspond to
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