Metallurgical Engineering · all questions

Physical Metallurgy
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162

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Q141

The structure-sensitive properties are
P. Elastic modulus
Q. Yield strength
R. Melting point
S. Fracture strength

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Q142

Slipping system for FCC

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Q143

Match the following.

P. Portevin-Le Chatlier effect	1. Dislocation pile up
Q. Bauschinger effect	2. Internal friction
R. Elastic after effect	3. Precipitation hardening
S. Modulus effect	4. Dynamic strain ageing

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Q144

A liquid alloy of the eutectic composition (L) undergoes the eutectic reaction to give α and β phases of compositions a and b respectively. The ratio of the relative amounts of α and β phases is

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Q145

Which one of the following techniques does not require quenching to obtain final case hardness?

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Q146

Cu₅Zn₈ is the complex cubic structure of gama brass is called electron compound under which category

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Q147

A steel contains 38.5 mass % pro-eutectoid ferrite and 61.3 mass % austenite at eutectoid temperature (723°C). The carbon content of steel, in mass %, is

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Q148

Stainless steel A has a stacking fault energy of 8 mJ.m^-2 and stainless steel B has a stacking fault energy of 45 mJ. m^-2. The correct statement out of the following are.
P. A will have a wider stacking faults than B
Q. A will strain harden more rapidly than B
R. A and B will develop similar type of substructure
S. A and B will have the same temperature dependence of flow stress.

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Q149

Match the following fractographic features with the type of fracture with which they are associated.

P. Striations	1. Ductile fracture
Q. Separated grain facets	2. Brittle fracture
R. Dimples	3. Fatigue fracture
S. Facets, river pattern	4. Intergrannular fracture

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Q150

According to Hume-Rothery rules, extensive solid solubility between elements X and Y is promoted by the two factors in the following list.
P. Same crystal structure of Z and Y.
Q. Large atomic size difference (> 20%) between X and Y.
R. Same valance of X and Y.
S. Large difference in melting points of X and Y.

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Q151

Ellingham diagram for M - MO_x reaction is a plot of

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Q152

Shottkey defect is a

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Q153

Which one of the following does not improve fatigue life of steel component?

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Q154

As per TTT diagram, bainite will form in eutectoid plain carbon steel, when heated to 850° followed by

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Q155

Arrange the following in terms of increasing severity of quench.
P. Oil quenching
Q. Water quenching
R. Water quenching with agitation
S. Brine quenching

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Q156

Coordination number in FCC crystal structure

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Q157

In a binary isomorphous system A-B, constitutional supercooling can occur in the

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Q158

Martensitic transformation in plane carbon steel occurs by

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Q159

A 0.2 wt.% plain carbon steel sheet is heated and equilibrated in the inter-critical region followed by instant water quenching. The microstructure of the quenched steel sheet consists of

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Q160

A material with grain size of ASTM No.6 has a lattice frictional stress 100 MN/m² and locking parameter (Hall-Petch constant) 0.10 MN/

m^{\frac{3}{2}}

Grain size of the material is approximately

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