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fari File Edit View History Bookmarks Window Help 4) 28% D Thu 8:38 AM Greisy Virgen - learn.wsu.edu g Which of the two 1. Which of the two tests, tension or compression, would require a machine with a higher loading capability, and why? 2. Explain the difference between hardness and hardenability 3. Describe the characteristics of (a) an alloy, (b) Pearlite, (c) Austenite, (d) Martensite, and (e) cementite 4. (a) Plot the Temperature-Time curve to just suppress pearlite formation in the below figure. (b) Estimate (with calculation) the critical cooling rate for material starting at point A to just suppress pearlite formation in the below plot (The line in part (a) is an approximated one and defines the relative area for pearlite formation; so the answer in part (b) should be an approximation, too). T(°C) Austenite (stable TE (727°C) 700 600 5001-? 400 Pearlite 110 102 103 104 105s time (s) 10 WE P escExplanation / Answer
1.Answer- In compression test a machine with higher loading capability would require because compressive strength for materials is generally higher than their tensile strength.
2.Answer- Hardness- Hardness is a material property. It is resistence to penetration. It also means the ability of a metal to cut another metal.
Hardenabilty- Hardenabilty is a way to indicate a material's potential to be harden by thermal(heat) treatment. It describes how deep material may be hardened upon quenching and tempering from high temperature.
Example- In steel, hardness is how hard the actual steel is based on resistance of penetration whereas, hardenability is the potential,steel has to be hardened by thermal treatment.
3.Answer-
a. Characterstics of Alloy:-
b. Characterstics of Pearlite:- It is a combination of 87%ferrite and 13%cementite. This leads high yield strength.
c. Characterstics of Austenite:- Possesses greatest resistance to corrosion and good mechanical properties at elevated temperature .
d.Characterstics of Martensite:-Can be easily welded and machined.
e.Characterstics of cementite:- Hardness of the steel increases.
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