Mechanical Engineering - Engineering Materials - Discussion

Discussion Forum : Engineering Materials - Section 2 (Q.No. 47)
47.
The toughness of a material __________ when it is heated.
remains same
decreases
increases
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
11 comments Page 1 of 2.

Virat said:   4 years ago
Toughness increases (if look ductile to brittle transition graph).

Salahuddin said:   4 years ago
Toughness increases when steel is heated. Consider hot forging, how tough the material has become?

Even if we impact tons of loads on the material it is not breaking. That means when a material is heated it becomes tougher.

Parth said:   5 years ago
As the hardness and tensile strength increase in heat-treated steel, toughness and ductility decrease... This elongation of the material causes residual compressive and tensile stresses in the material. Welding stresses can be minimized by using heat sink welding, which results in lower metal temperatures, and by annealing.

So the answer is B) decrease.
(1)

Biswajit said:   5 years ago
@Komal.

At the same time, the plastic deformation increases that mean the breaking point gets delay so area get increases.

Komal said:   6 years ago
By increasing temperature, the yield strength of metal decreases which results in less area under curve compares to former (toughness decreases).

Neeraj said:   7 years ago
C is right answer.

Krrish said:   8 years ago
Increase should be the answer.

Subhajit said:   8 years ago
Toughness should not decrease. Toughness is shock absorbing capacity. For steels with an increase in temperature, the steel becomes tougher and softer due to the stress relieving recovery grain growth etc processes, provided time is allowed.

Subhajit said:   8 years ago
Toughness should not decrease. Toughness is shock absorbing capacity. For steels with an increase in temperature, the steel becomes tougher and softer due to the stress relieving recovery grain growth etc processes, provided time is allowed.

Pavan kumar said:   8 years ago
Toughness increases with increase in temperature.


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