This quiz covers: Phases and phase diagrams, iron-carbon system and its alloys, iron carbide system, steel and cast iron transformation. Alloys are metallic compounds made up of one or more metals and non-metals. They are usually made by melting the substances, mixing them together, and then letting them cool to room temperature.  Examples of alloys include: Steel: A combination of iron (metal) and carbon (non-metal) Bronze: A combination of copper (metal) and tin (metal) Brass: An alloy formed by mixing two metals, copper and zinc  A phase diagram, also known as a constitutional... Show more

This quiz covers: Phases and phase diagrams, iron-carbon system and its alloys, iron carbide system, steel and cast iron transformation.

Alloys are metallic compounds made up of one or more metals and non-metals. They are usually made by melting the substances, mixing them together, and then letting them cool to room temperature. 

Examples of alloys include:
Steel: A combination of iron (metal) and carbon (non-metal)
Bronze: A combination of copper (metal) and tin (metal)
Brass: An alloy formed by mixing two metals, copper and zinc 

A phase diagram, also known as a constitutional diagram, is a graphical representation of the composition and temperature limits of phase fields in an alloy system. It shows the equilibrium constitution of an alloy made of components A and B for all combinations of T and XB. 

The phases present in an alloy depend on the alloy composition and the thermal treatment to which the alloy has been exposed. The composition of an alloy is given in the form A - x%B. 

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Engineering Materials & Metallurgy Practice Test: Constitution of Alloys and Phase Diagrams

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25 Questions

1. Which of the following is a nonmagnetic iron?

AusteniteFerriteAlnicoCementite

2. In this figure, what does O denote?

Melting pointTriple pointVaporization pointBoiling point

3. Pure iron exists in ________ allotropic forms.

FourTwoOneThree

4. At what temperature does eutectoid reaction occur?

928oC723oC418oC666oC

5. What is the triple point of water?

0.0098oC0.022oC0.098oC0.0022oC

6. What is the solubility of α ferrite at 0^oC?

0.02%0.1%0.0004%0.005%

7. How much carbon does hypoeutectoid steel contain?

<0.8%0.8%>0.8%8%

8. What is the crystal structure of ϒ iron?

Face-centered cubicHexagonal closely packedBody-centered tetrahedralBody-centered cubic

9. Which microconstituent of iron-carbon alloys does this figure demonstrate?

LedeburiteMartensiteBainitePearlite

10. Cooling of hypoeutectoid steel post heating forms __________ ferrite.

ProeutectoidMild eutectoidPosteutectoidHypereutectoid 2.08%

11. Composition up to 0.008% carbon is considered as _________

SteelCast ironAnnealed steelPure iron

12. What is the line QR in this fooling curve known as?

Latent heating lineEutectic compound systemHorizontal thermal arrestBinary solid

13. Alloys containing 2.0-6.7% carbon are considered as __________

Cast-ironBrassAluminumSteel

14. At what temperature does δ ferrite melt?

1990 F1674 F2800 F2541 F

15. What is the crystal structure of austenite upon heating?

Body-centered cubicBody-centered tetrahedralHexagonal closely packedFace-centered cubic

16. ___________ is a mixture of radial lamellae of ferrite and cementite.

MartensiteTroostiteSorbiteFerrite

17. Cooling of austenite of eutectoid composition at 723^oC results in formation of ________

PearliteLedeburiteBainiteSphereoidite

18. Separation of single-phase solid regions from two-phase solid regions is done by _________

Solidus lineLiquidus lineSolvus lineEutectic point

19. Eutectoid steel is heated at __________

750oC450oC150oC950oC

20. At what temperature does peritectic reaction occur?

1148oC1495oC1778oC723oC

21. A mixture of austenite and cementite is called ___________

PearliteBainiteFerriteLedeburite

22. Which of the following cannot be obtained using a phase diagram?

Equilibrium solid solubilityTemperature range for solidificationPurity of materialsMelting temperatures of various phases

23. Which of the following is Not applicable to α iron?

Can be hot workedMagneticSoftDuctile

24. How many types of systems are applicable for phase diagrams?

ThreeTwoFourOne

25. The existence of two or more crystal structures for any substance, depending on temperature, is known as _________

AllotropySolidificationIntersticesSolubility