A hardened steel essentially contains (A) Sorbite (B) Troostite (C) Martensite (D) None of these

A hardened steel essentially contains
(A) Sorbite
(B) Troostite
(C) Martensite
(D) None of these
by

1 Answer

Answer :

(C) Martensite
by

Related questions

Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to (A) Sorbite (B) Bainite (C) Martensite (D) Troostite

Description : Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to (A) Sorbite (B) Bainite (C) Martensite (D) Troostite

Last Answer : (B) Bainite

Sub zero treatment of steel is done to (A) Suppress martensite transformation (B) Enhance its working performance in sub zero atmosphere (C) Reduce the retained austenite in hardened steel (D) Induce temper brittleness after its hardening

Description : Sub zero treatment of steel is done to (A) Suppress martensite transformation (B) Enhance its working performance in sub zero atmosphere (C) Reduce the retained austenite in hardened steel (D) Induce temper brittleness after its hardening

Last Answer : Option C

Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel. (A) 0.01 to 0.10 (B) 0.2 to 0.4 (C) 0.5 to 0.7 (D) 0.8 to 1.0

Description : Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel. (A) 0.01 to 0.10 (B) 0.2 to 0.4 (C) 0.5 to 0.7 (D) 0.8 to 1.0

Last Answer : (B) 0.2 to 0.4

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the (A) Retained austenite (B) Martensite formation (C) Relatively high sulphur content in the base metal (D) Sufficient hydrogen present in the welding arc

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Last Answer : (B) Martensite formation

Eutectoid composition of carbon steel at room temperature is (A) Cementite (B) Pearlite(C) Martensite (D) Ferrite

Description : Eutectoid composition of carbon steel at room temperature is (A) Cementite (B) Pearlite (C) Martensite (D) Ferrite

Last Answer : Option B

Explain the formation of micro structures of pearlite, bainite and martensite in steel.

Description : Explain the formation of micro structures of pearlite, bainite and martensite in steel.

Last Answer : If austenite containing about 0.80 percent carbon is slowly cooled through the critical temperature, ferrite and cementite are rejected simultaneously, forming alternate plates or lamellae. This ... This phase has a tetragonal crystal structure and contains carbon in supersaturated solid solution.

Hardened steel is softened by (A) Normalising (B) Tempering (C) Annealing (D) Carburising

Description : Hardened steel is softened by (A) Normalising (B) Tempering (C) Annealing (D) Carburising

Last Answer : (B) Tempering

Softening of hardened steel is done by its (A) Normalising (B) Tempering (C) Annealing (D) Carburising

Description : Softening of hardened steel is done by its (A) Normalising (B) Tempering (C) Annealing (D) Carburising

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_________ is the hardest material out of the following. (A) Boron carbide (B) Tungsten carbide (C) Hardened steel (D) Silicon carbide

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Softening of hardened steel is done by its (A) Normalising (B) Tempering (C) Annealing (D) Carburising

Description : Softening of hardened steel is done by its (A) Normalising (B) Tempering (C) Annealing (D) Carburising

Last Answer : (A) Normalising

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Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld (D) Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Description : Steels with high carbon equivalent have poor Weldability, because in these steels during welding (A) Carbon and other alloying elements get oxidised from the weld pool (B) Excessive ferrite forms in the ... of carbon and other element occurs in the weld pool leading to poor properties of the weld

Last Answer : (C) Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld

Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating. (A) Cementite (B) Austenite (C) Martensite (D) Pearlite

Description : Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating. (A) Cementite (B) Austenite (C) Martensite (D) Pearlite

Last Answer : Option B

Maraging steels derive their strength from the following mechanism: (A) A fine, highly dislocated and strong martensite (B) Fine dispersions of inter-metallic of Fe, Ni, Ti etc (C) Fine dispersions of alloy carbides in a ferrite matrix (D) Fine dispersions of Fe3 C nucleated on dislocations in austenite

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Anthracite coal (A) Contains more volatile matter than bituminous coal (B) Ignites more easily than bituminous coal (C) Is essentially a coking coal (D) Burns with short, bluish, yellow-tipped flame producing very little smoke

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