Answered: 8. The purpose for tempering steel…

Precision Machining Technology (MindTap Course List)

2nd Edition

ISBN:9781285444543

Author:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Publisher:Peter J. Hoffman, Eric S. Hopewell, Brian Janes

Chapter2: Measurement, Materials, And Safety

Section2.7: Heat Treatment Of Metals

Problem 2RQ: Direct hardening can be performed on steel containing at least________ carbon.

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Can someone please help me to answer all of the following questions. PLEASE AND THANK YOU!!!!

8. The purpose for tempering steel after hardening is to
a. increase toughness.
b. increase hardness.
c. increase ultimate tensile strength.
d. improve abrasion resistance.
e. improve hardenability.
9. Plain carbon steel has defined compositional limits for all of the following, except
a. manganese.
b. silicon.
C. sulfur.
d. phosphorus.
e.
10. Retained austenite is considered undesirable, because it
a. is dimensionally unstable.
b. is relatively soft.
can unpredictably transform to brittle untempered martensite.
d. all of the above.
C.

Transcribed Image Text:1. A Jominey curve is used to estimate a. the expected microstructure after quenching. b. the depth of hardening. c. the M, (martenisitic start) temperature. d. the austenitic transformation temperature. e. grain size. 2. Ideal diameter is a measure of the a. alloy hardening factor used in the Grossman equation. b. grain size hardening factor used in the Grossman equation C. percent martensite present in the microstructure. d. depth of hardening. e. maximum achievable hardness. 3. AT-T-T diagram can be used to a. design a cooling profile that will result in a particular microstructure. b. determine the maximum achievable hardness upon quenching. estimate final hardness after quenching and tempering. d. estimate toughness after quenching and tempering. e. estimate solubility of alloying elements. Č. 4. A common alloying element in steel with the greatest effect on hardenability is a. manganese b. silicon C. nickel d. chromium e. molybdenum 5. The reason that 304 stainless steel typically has an austenitic microstructure at room temperature is a. both chromium and nickel are austenite stabilizers. b. the low carbon content. C. the large grain size. d. large amount of cold work typically used in forming. due to the presence of chromium carbides. 6. A steel that cannot be effectively hardened by quenching and tempering is a. 1040 b. 4140 8620 d. 304 stainless steel e. 410 stainless steel C. 7. Of the following, the type of heat treatment that would not be case hardening is a. carburizing. b. nitriding. c. flame hardening. d. precipitation hardening. induction hardening. e.

Expert Solution

Step 1

(1) Jominy curve is used for the estimation of the hardenability of the steel after the quenching process. Hence option A is the right answer as it tells about microstructure after quenching.

(2)

Ideal diameter is the measure of the percentage of martensite present in the microstructure.

Hence option C is the right answer.

(3)

TTT diagram is also known as time-temperature transformation diagram. this diagram shows different cooling curves at different temperatures.

Hence option A is the right answer.

(4)

Chromium is used to increase the hardenability of the steel.

Hence option D Is the right answer.

(5)

The reason that 304 stainless steel typically has an austenite microstructure at room temperature is both chromium and nickel are austenite stabilizers.

Option A is the right answer.

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