ME 3010 Test 2

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85shelbyc
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82040
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ME 3010 Test 2
Updated:
2011-04-26 23:55:13
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ME Test Exam
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ME 3010 Test 2
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  1. The reaction involving the transformation of one liquid phase into two solid phases upon cooling is called ___.

    A) eutectic reaction
    B) peritectic reaction
    C) recrystallization
    D) eutectoid reaction
    A) eutectic reaction
    (this multiple choice question has been scrambled)
  2. Using the S-N curve provided below, what is the fatigue lifetime at the stress amplitude of 225 MPa?

    A) ~ 8 cycles
    B) Infinite number of cycles
    C) ~ 6 cycles
    D) ~ 106 cycles
    E) ~ 108 cycles
    D)
    (this multiple choice question has been scrambled)
  3. ___ Ni-based superalloys will exhibit the best creep resistance.

    A) directionally solidified
    B) single-crystal
    C) fine-grained
    D) coarse-grained
    B)
    (this multiple choice question has been scrambled)
  4. A fatigue test was conducted in which the mean stress was 46.2 MPa and the stress amplitude was 219 MPa. The maximum stress level is ___.

    A) 316.2 MPa
    B) 155.7 MPa
    C) 172.8 MPa
    D) 265.2 MPa
    D)
    (this multiple choice question has been scrambled)
  5. ___ is a standardized test that is widely used in US to measure the impact energy.

    A) Brinell hardness test
    B) creep test
    C) Charpy test
    D) fatigue test
    C)
    (this multiple choice question has been scrambled)
  6. What is the magnitude of the maximum stress that exists at the tip of a surface crack having a radius of curvature of 2.5x10-4 mm and a crack length of 2.5x10-2 mm when a tensile stress of 170 MPa is applied?

    A) 3400 MPa
    B) 1700 MPa
    C) 170 MPa
    D) 2404 MPa
    A)
    (this multiple choice question has been scrambled)
  7. The time_dependent plastic deformation of materials subjected to a constant load (or stress) and temperatures greater than about 0.4Tm(Tm = absolute melting temperature) is termed ___.

    A) creep
    B) recrystallization
    C) fatigue
    D) recovery
    A)
    (this multiple choice question has been scrambled)
  8. For brittle fracture, cracks are unstable, and the fracture surface has relatively ___ appearance.

    A) rough
    B) irregular
    C) fibrous
    D) flat
    D)
    (this multiple choice question has been scrambled)
  9. ___ fracture is almost always preferred for the components involoved as (1) during which the presence of plastic deformation gives some warning and (2) more strain energy is required to induce this type of fracture.

    A) brittle
    B) impact
    C) ductile
    D) fatigue
    C)
    (this multiple choice question has been scrambled)
  10. The carbon solubility in ferrite is ___ than that in austenite

    A) higher
    B) the same
    C) can not be determined
    D) lower
    D)
    (this multiple choice question has been scrambled)
  11. A homogeneous random mixture of chemically distinct elements that form a single phase is a(n) ___.

    A) solid solution
    B) component
    C) intermediate phase
    D) mechanical mixture
    A)
    (this multiple choice question has been scrambled)
  12. Which of the following treatments can improve the fatigue life of a steel component? (All that apply)

    A) Annealing at high temperature
    B) Case hardening
    C) Cutting a notch in the component
    D) Roughening the component by grinding
    E) Shot peening
    • B)
    • E)
  13. Which of the following treatments can increase the strength of a metallic material? (All that apply)

    A) Converting austenite to martensite
    B) Grain size reduction
    C) Cold working
    D) Converting martensite to tempered martensite
    E) Forming solid solution
    • A)
    • B)
    • C)
    • E)
  14. One limitation of equilibrium phase diagrams is that it does not provide any information of ___. (All that apply)

    A) temperature
    B) martensite
    C) pearlite
    D) ferrite
    E) austenite
    F) tempered martensite
    • B)
    • F)
  15. Tempering is accomplished by heating a martensitic steel to a temperature, normally between 200-800oC, for a specified time period to allow microstructure/property to change through diffusion.

    True
    -or-
    False
    False
  16. The material is more likely to experience a brittle fracture in service if it has a high ductile-to-brittle transition temperature.

    True
    -or-
    False
    True
  17. Hypoeutectoid steels are usually stronger and harder than hypereutectoid steels if the same heat treatment is applied.

    True
    -or-
    False
    False
  18. Failure of a component in service can occur at an applied stress that is lower than its yield strength if the applied stress is fluctuating.

    True
    -or-
    False
    True
  19. Cast irons contain more carbon than steels.

    True
    -or-
    False
    True
  20. Martensitic transformation is a very slow process.

    True
    -or-
    False
    False
  21. For a hypoeutectoid steel, the proeutectoid ferrite forms at the same time with the eutectoid ferrite because both contain 0.022 wt% C.

    True
    -or-
    False
    False
  22. When the concentration of solute in a solid solution exceeds the solubility limit, a new solid solution or phase that has a composition similar to that of the original solid solution will form.

    True
    -or-
    False
    False
  23. Coarse pearlite forms at temperatures just below the eutectoid temperature, e.g., ~680oC.

    True
    -or-
    False
    True
  24. Tempered martensite is a single-phase microstructure, which shows a good combination of strength and ductility.

    True
    -or-
    False
    False
  25. A steel with 1.0wt% C is a ___.

    A) hypoeutectoid steel
    B) need to know the temperature to determine
    C) hypereutectoid steel
    D) eutectoid steel
    C)
    (this multiple choice question has been scrambled)

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