What two general competing processes control the creep rate of a metal? What is the relative strength (or rate) of the two processes during Stage I and Stage II creep behavior?

Q: Cold working of metals will give better final properties than hot working. Select one: True False

A: Hot and cold working: Important difference between these processes is hot working is done at high…

Q: hod? 2- What is the effect of heat treatment on the average grain size? And what is the influence of…

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Q: What are intergranular fracture and transgranular fracture? When do they usually happen?

A: Intergranular fracture and transgranular fracture are types of fracture generally occurs in micro…

Q: What physical reasons why reducing grain size is an effective alternative for increasing the…

A: Smaller grains have greater ratios of surface area to volume, which means a greater ratio of grain…

Q: Describe the test methods that can be used to reflect the fatigue and creep resistance of materials…

A: Fatigue and creep are two important material properties that determine the longevity and reliability…

Q: Does consideration of creep become important when materials are in service for long periods of time?

A: Creep: When a part of any member  is subjected to constant stress at high temperature for a long…

Q: When does the mean stress level affect fatigue crack propagation rates in metal alloys?

A: A component is subjected to a fluctuating stress fails at a stress much below their static strength.…

Q: Cold working of metals will give better final properties than hot working. Select one: True False

A: Solution:

Q: A hot rolled AISI 1212 steel is given a cold work of 20 percent. Determine the new values ​​of the…

A:

Q: Are fatigue striations always visible on a fatigue fracture surface? If not, under what conditions…

A: Answer Fatigue Striation : these are the marks induced on the surface of fracture and goes on…

Q: When is Strain hardening used? How is it performed?

A: Strain hardening is used when there is a need to increase the hardness of the material. It also…

Q: Is the presence of microvoid coalescence on a metal fracture surface inconsistent with macroscopic…

A: Microvoid Coalescence: It is a mechanism to show the failure method of a ductile material.

Q: Does the creep strength vary with temperature?

A: Creep: When a part of any member  is subjected to constant stress at high temperature for a long…

Q: The uniaxial stress-strain diagram of a typical material can be following? Can you expect Kinematic…

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Q: In what class of material is stress whitening often seen, and what is the physical origin of the…

A: The phenomenon of stress whitening is generally observed in amorphous solids. However, it may also…

Q: If the material is ductile and subjected to a static load , is it not necessary to use stress…

A: It is not necessary to use stress concentration factors for ductile material under static loading…

Q: Analyse effects of cold work and Annealing in term of change in microstructure and mechanical…

A: Cold Working:-  Cold working is a metal working process which can be done at below its…

Q: What visual evidence supports the presence of significant grain boundary sliding in many creep…

A: Irregular atomic bed displacement occurred due to grain boundary sliding. These displacements of…

Q: 11. Steady-state creep rate data are given below iron at 900 C. &($) 104 10-6 σ (MPa) 17 6.5 If it…

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Q: 1) Chapter 2: How do grain boundaries contribute to strain hardening in metals? 2) Chapter 3: Review…

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Q: Discuss (i) fatigue failure of material  (ii) S-N Curve with a example of aluminium

A: ANSWER (1)

Q: What would happen to the wire if it were stretched beyond its elastic limit? What would happen to…

A: Consider the diagram of stress vs strain for tension test for a typical tensile metal as shown…

Q: is the effect of increasing the cooling rate (from furnace cooling to air cooling) on the hardness…

A: Effective elongation as a function of cooling rate. The changes in mechanical characteristics of…

Q: What is the difference in appearance between ductile & brittle fractures?

A: Fracture is a phenomenon in which body is separated into two or more pieces under the application of…

Q: Regarding annealing, choose the right answer (One or more): The actual annealing time must be long…

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Q: How does strain hardening and grain size reduction affect elastic modulus

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Q: What is the failure due to fatigue? What factors influence the fatigue strength of the material?…

A: Fatigue failure is the formation of cracks due to repetitive load which results in the damage of the…

Q: Question 4: Using the following TTT diagram for an iron-carbon alloy of eutectoid composition,…

A: Note: As per Bartleby Answering guidelines, we are supposed to give answer for first three…

Q: Perfectly thermal, the material has a purposely sharp temperature. Why doesn't this process fracture…

A:

Q: In the mid-1950s, two U-52 bomber planes disappeared from the radar screen while flying over the…

A: (a) The type of failure is fatigue failure. (b) from the diagram, the suitable material is Steel…

Q: Q-6: When do the "ears" appear in drawn cup, through cup drawing tests? * Your answer

A: 6. When do the "ears" appear in drawn cup, through cup drawing tests?       Note :- you have posted…

Q: Under room temperature, why grain boundaries are beneficial for improving materials strength? How…

A: An interface between two surfaces is called the grain boundary. Due to grain boundaries the thermal…

Q: When materials are in service for long periods of time, why does the considerations of creep become…

A: Creep is the natural tendency of a material to gradually move or permanently deform as a result of…

Q: X What are circumstances in which the possibility of Creep rupture May Safely be neglected

A: Introduction: Creep rupture: Creep rupture, also known as stress rupture, is the process by which a…

Q: (a) What are the characteristics of the surface of a ductile fracture and a brittle fracture of a…

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Q: 1) How do you understand whether a metal or metal alloy is ductile or brittle after the fracture?…

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Q: What are circumstances in which the possibility of Creep rupture May Safely be neglected?

A: In this solution, we shall try to understand with the help of an example where possibility of creep…

Q: Is the Paris power law (Eq. 10-3) relevant for all conditions of fatigue crack growth?

A: Paris' law (also known as the Paris–Erdogan equation) is a crack growth equation that gives the rate…

Q: Why are pairs of materials more likely to experience thermal stress problems when they represent two…

A: Thermal stresses are induced in the material due to the materials subjected to temperature loads.…

Q: High-strength stainless steel is required for use in building structures and equipment (e.g. ,…

A: Given Data: The thickness of the plate, t=3 cm The initial temperature of the plate, Ti=40 C Final…

Q: A cylindrical specimen has an initial radius of 20 mm. It is reduced by cold work to 13 mm. It is…

A:

Q: What are the different types of heat treatments? Write a detailed note on each type. How can…

A: Heat treatment is a process of heating the material to some specific temperature, holding at that…

Q: In order to find out the effects of the grain sizes on the mechanical strength of a metal, three…

A: Given data:

Q: Two pieces of the same aluminium alloy were Precipitation Hardened; one by Natural Aging (25°C) and…

A: The activation energy is calculated as: Q=1.987T1T2T2-T1(2.303logt1t2cal/mol here, T1 = Room…

Q: Metal y (mJ/m).n Šlip Character (a) Discuss why Planar slip is associated with a small stacking…

A: (a) it is asking the reason by which the planer slip is associated with small stacking fault energy.…

Q: (b) (i) Describe the stages of cracking in brittle materials with reference to applied stress.

A: Brittle material: The material which fail suddenly without any plastic deformation when stress is…

Q: When does fatigue occur in metals?

A: Many times force acting on the mechanical component varies in magnitude from a positive value to the…

Thermal Properties of Materials

In mechanical engineering, the thermal property is represented as the physical quantity that is relevant to the application of heat. The thermal properties are evaluated by variations in any specific material due to low heat or high heat. The quantities that influence the thermal property of the materials are mass, density, temperature, and many others.