Engineering
08.07.2021 22:34
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Which of the following statements is true of a time management plan? a. it is a

Which of the following statements is true of a time management plan?
a. it is a work in progress that will need to be altered many times.
b. the first plan you create is the one you should stick with.
c. you don’t need to schedule breaks or free time.
d. it isn’t important to follow it closely; it is more of a reference.
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chiquita77
chiquita77
4,9(72 marks)

(a) 2.5 and 6 seconds

(b) 265 HB (27 HRC)

Explanation:

(a) A horizontal line at 550°C intersects the 50% and reaction completion curves at  about 2.5 and 6 seconds, respectively; these are the times it will take for the austenite-to-pearlite reaction to go to 50% completion

(b) The pearlite formed will be fine pearlite. From Figure 10.30a, the hardness of an alloy of composition  0.76 wt% C that consists of fine pearlite is about 265 HB (27 HRC).

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