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Sheet 3 - Hardenability

This document discusses the hardenability of different steel alloys when quenched in oil or water. It provides instructions for constructing hardness profiles of 8640 and 5140 steel specimens quenched in oil, and determining suitable alloys and quenching media to achieve specified hardness levels and martensite microstructures based on alloy composition and specimen size. The key factors are the alloy composition, specimen size and geometry, quenching medium, and desired properties like hardness level and microstructure percentage.

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47 views7 pages

Sheet 3 - Hardenability

This document discusses the hardenability of different steel alloys when quenched in oil or water. It provides instructions for constructing hardness profiles of 8640 and 5140 steel specimens quenched in oil, and determining suitable alloys and quenching media to achieve specified hardness levels and martensite microstructures based on alloy composition and specimen size. The key factors are the alloy composition, specimen size and geometry, quenching medium, and desired properties like hardness level and microstructure percentage.

Uploaded by

saxadi4814
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Alexandria University Second Semester (2020/2021)

Faculty of Engineering Basic Manufacturing Methods


Production Engineering Department PEDx19

Sheet 3 : Hardenability
1. Construct radial hardness profiles for the following:
i. A 2 in. diameter cylindrical specimen of an 8640 steel alloy that has
been quenched in moderately agitated oil.
ii. A 2 in. diameter cylindrical specimen of an 5140 steel alloy that has
been quenched in moderately agitated oil.
iii. Comment on your results.

Oil
2. A cylindrical piece of steel 1 in. diameter is to be quenched in
moderately agitated oil. Surface and center hardnesses must be at least
55 and 50 HRCr respectively. Which of the following alloys will satisfy
these requirements: 1040, 5140, 4340, 4140, and 8640? Justify your
choice(s).

Oil
3. A cylindrical piece of 8640 steel 2 in. diameter is to be quenched such
that a center hardness of 45 HRC. What is the quenching medium?

Water Oil
4. A cylindrical piece of steel 1.5 in. diameter is to be quenched such that
a microstructure consisting of at least 80 martensite will be produced
throughout the entire piece. Which of the following alloys will satlsfv
these requirements: 1040, 5140, 4340, 4140, and 8640? If the
quenching medium is (a) moderately agitated oil, and (b) moderately .
agitated water. Justify your choice(s).
Water Oil

5. A cylindrical piece of 4140 steel is to be quenched in moderately


agitated oil. If the microstructure consisting of at least 50 martensite
throuqhout the entire piece, what is the maximum allowable diameter?
Justify your answer.

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