Mechanical Metallurgy - Askmemetallurgy

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Eben

Asked: May 31, 2021In: Mechanical Metallurgy

A researcher is working on aluminum bronze alloy to be used as a pump. During production of the alloy, the researcher quenched and tempered the product. Will the fracture toughness of this product be high or low? Would you expect the resistance of the alloy to crack nucleation differ from resistance to crack growth? Briefly discuss

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Anonymous

Asked: May 24, 2021In: Mechanical Metallurgy

What is Slip System?

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SuvamCopper

Asked: May 22, 2021In: Mechanical Metallurgy

Derive the relationship between strain hardening exponent and uniform strain obtained by using tensile test of a material.

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Askmemetallurgy Official

Asked: March 31, 2021In: Mechanical Metallurgy

GATE MT 2021 Q49. An infinite metal plate has a central through-thickness crack of length 𝟖𝟎/𝝅 mm. The maximum applied stress (in MPa) that the plate can sustain in mode I is: (round off to nearest integer). Assume: Linear elastic fracture mechanics is validGiven: Fracture toughness, 𝑲𝑰𝑪= 20 MPa m1/2

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Askmemetallurgy Official

Asked: March 31, 2021In: Mechanical Metallurgy

GATE MT 2021 Q48. A metal plate is in a state of plane strain (e𝒛𝒛 = 𝟎) with s𝒙𝒙 = s𝒚𝒚¹ 𝟎 and t𝒙𝒚 = t𝒙𝒛 = t𝒚𝒛 = 𝟎. If the Poisson’s ratio is 0.3, the ratio, s𝒛𝒛/s𝒙𝒙 is (round off to 1 decimal place).

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Akesh

Asked: March 14, 2021In: Mechanical Metallurgy

What is the reason for constant lower yeild point appearing in stress strain cure for low carbon steel

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AakashSingh

Asked: March 10, 2021In: Mechanical Metallurgy

What is Dislocation and it’s types?

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Poll

Askmemetallurgy Official

Asked: March 6, 2021In: Mechanical Metallurgy

GATE MT 2021 Q32. A single crystal aluminium sample is subjected to uniaxial tension along [112] direction. If the applied tensile stress is 100 MPa and the critical resolved shear stress (CRSS) is 25 MPa, which one of the following slip systems will be activated?

Poll Results

80%(A) [1̅01](111) ( 4 voters )

20%(B) [1̅10](111) ( 1 voter )

0%(C) [101](111̅)

0%(D) [011](111̅)

Based On 5 Votes

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Askmemetallurgy Official

Asked: March 6, 2021In: Mechanical Metallurgy

GATE MT 2021 Q18. A body is subjected to a state of stress given by the following stress tensor: ( 𝟓𝟎 𝟎 𝟎) ( ( 𝟎 𝟐𝟎𝟎 𝟎 ) (𝟎 𝟎 𝟏𝟎𝟎) MPa. If yielding is predicted by the Tresca Criterion, the uniaxial tensile yield stress (in MPa) of the body should be less than or equal to: (round off to nearest integer).

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Askmemetallurgy Official

Asked: March 6, 2021In: Mechanical Metallurgy

GATE MT 2021 Q8. Which one of the following is FALSE for creep deformation?

Poll Results

72.73%(A) The minimum creep rate is obtained in the primary stage (stage I). ( 8 voters )

18.18%(B) Creep resistance decreases with decrease in grain size. ( 2 voters )

0%(C) Coble creep occurs via grain boundary diffusion.

9.09%(D) Nabarro-Herring creep occurs via lattice diffusion. ( 1 voter )

Based On 11 Votes

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xavi

Asked: January 28, 2021In: Mechanical Metallurgy

If volume fraction of spherical shaped second phase particles is 50% with radius of 3 µm, interspacing of particles is (in µm)

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FRIDAY

Asked: January 17, 2021In: Mechanical Metallurgy

A material displayed a strain rate of deformation of 4.5 x 10-7 s-1 after a time of 100 h under an applied stress of 45 MPa. What will be the deformation rate after a time of 300 h if the material is displaying a logarithmic creep behaviour? e = e0 + alphaln(1+gammat)

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Poll

xavi

Asked: January 14, 2021In: Mechanical Metallurgy

Hydrostatic stress produces

Poll Results

42.86%Only elastic volume changes and not plastic deformation ( 6 voters )

0%Only plastic deformation and not elastic volume changes

7.14%Only permanent deformation and not volume changes ( 1 voter )

50%Only volume changes and no plastic deformation ( 7 voters )

Based On 14 Votes

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xavi

Asked: January 11, 2021In: Mechanical Metallurgy

Metals having high SFE promotes dynamic recovery while metals having low SFE promotes dynamic recrystallization. Why?

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xavi

Asked: January 4, 2021In: Mechanical Metallurgy

Why does young’s modulus increase on lowering the temperature?

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saianandhi

Asked: December 31, 2020In: Mechanical Metallurgy

The ultimate tensile stress (UTS)of a material is 124MPA. When the material is subjected to a stress amplitude of 90% of the UTS, then its fatigue life is 1000 cycles. At a stress amplitude of 62MPa the material can take up loading up to 1million (106 )cycles. The life(in number of cycles)corresponding to a stress amplitude of 65MPa is

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Poll

Sage Mode

Asked: December 28, 2020In: Mechanical Metallurgy

Why Titanic ship failed?

Poll Results

0%Due to micro cracks

90.7%Due to Ductile to Brittle Transformation ( 39 voters )

6.98%Due to low toughness ( ship sank after iceberg collision) ( 3 voters )

2.33%Due to captain inexperience ( 1 voter )

Based On 43 Votes

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Jhajhi

Asked: December 24, 2020In: Mechanical Metallurgy

A pressure cylinder with with a 100 mm inside diameter and a 6 mm wall thickness is subject to internal pressure that varies from –p/4 to p. The steel has fatigue limit of 410 MPa in completely reverse bending. Under a repeated stress cycle of zero to a maximum stress in tension the same steel can withstand 620 MPa without failure in 107 cycles. What is the maximum internal pressure that can be withstood by the cylinder without fatigue failure before 107 cycles?

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Sage Mode

Asked: November 12, 2020In: Mechanical Metallurgy

whether the stress increases or decreases in material after long time in creep test. solve the question in image

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yogi

Asked: November 10, 2020In: Mechanical Metallurgy

under application of stress,when a straight dislocation of radius of curvature(r=infinity) tries to bow out around the precipitate of spacing l there is an instability during the changing at curvature at ?

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Lopamudra Singh

Asked: November 5, 2020In: Mechanical Metallurgy

If I’ve to remove one edge dislocation from an infinity array of dislocations or you can say grain boundary, then how will position of other dislocations will shift and what will be the force interaction in between them.

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Malika MazyIron

Asked: September 14, 2020In: Mechanical Metallurgy

Strain hardening rate for Polycrystallin FCC crystal should be………… times of strain hardening rate of single crystal ??

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JaihoCopper

Asked: August 6, 2020In: Mechanical Metallurgy

Case hardening increases the fatigue life how? Even though it increases the hardness and in harder Materials crack propagation is much easier compare to soft?

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JaihoCopper

Asked: August 6, 2020In: Mechanical Metallurgy

Why striations have ridge like shape?

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Ankit Singh BharadwajCopper

Asked: July 15, 2020In: Mechanical Metallurgy

Why buckling occurs in compression?

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