91. 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
92. Which one of the following elements is an austenite stabilizer?
93. 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
94. 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
| 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 |
95. 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
96. In the homogenous nucleation, as compared to heterogeneous nucleation
97. 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.
98. During load Vs load-line displacement measurement for the determination of J10 conipliance is measured at intervals to estimate
99. A defect that is bounded by two mirror planes is
100. The growth rate of pearlite, v, and the interlamellar spacing S are given by the following relation, $$v = k.\frac{1}{S}\left( {\frac{{1 - {S_c}}}{S}} \right)$$ 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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