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Materials Science A / Materiaalkunde A - 214

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Match the following optical micrographs of various steel alloys with their correct classifications. / 

Pas die volgende optiese mikrograwe van verskeie staalallooie by hul korrekte klassifikasies.

 

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How many phases occur in the following micrographs? /

Hoeveel fases verskyn in die volgende mikrograwe?

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The optical micrograph below shows fine, needle-shaped grains of a eutectoid steel subjected to a different heat treatment compared to the steels whose microstructures were shown in micrographs A and B. Select the correct statement regarding the microstructure shown below. 

/ Die optiese mikrograaf hieronder toon fyn, naaldvormige korrels van 'n eutektoïede staal wat aan 'n ander hittebehandeling onderwerp is in vergelyking met die staal waarvan die mikrostrukture in mikrograwe A en B getoon is. Kies die korrekte stelling met betrekking tot die mikrostruktuur wat hieronder getoon word.

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A particle of cementite is circled in both micrographs A and B. However, the size of the particles are significantly smaller in B than in A. Match each of the micrographs with the microstructures that they represent.  

/ 'n Deeltjie sementiet word in beide mikrograwe A en B omsirkel. Die grootte van die deeltjies is egter aansienlik kleiner in B as in A. Pas elkeen van die mikrograwe by die mikrostrukture wat hulle verteenwoordig.

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The micrograph in A shows a serious scratch in the top half of the image. What sequence of steps should be followed to remove the scratch? / Die mikrograaf in A toon 'n ernstige krap in die boonste helfte van die beeld. Watter volgorde van stappe moet gevolg word om die krap te verwyder?

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Which of the following simplified diagrams best represents the light paths for the etched eutectoid steel specimen that cause cementite and pores to appear darker than the ferrite when viewed through a reflective optical microscope? / 

Watter van die volgende vereenvoudigde diagramme verteenwoordig die ligbane die beste vir die geëtste eutektoïede staalmonster wat veroorsaak dat sementiet en porieë donkerder as die ferriet lyk wanneer dit deur 'n reflektiewe optiese mikroskoop bekyk word? Vertaling: Microscope lens = mikroskoop lens.

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Select the statement that is the best response for the following sentence: "Etching of a metal specimen is when pure water is used to create a mirror-like surface for observing microstructural features." /

Kies die stelling wat die beste reaksie vir die volgende sin is: "Ets van 'n metaalmonster is wanneer suiwer water gebruik word om 'n spieëlagtige oppervlak te skep vir die waarneming van mikrostrukturele kenmerke."

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The optical micrograph below (left) shows grains of pearlite for an etched eutectoid steel with a schematic (right) of the cross-section of the polished and subsequently etched surface of this specimen. Select the most correct statement. /

Die optiese mikrograaf hieronder (links) toon korrels van perliet vir 'n eutektoïede staal met 'n skematiese diagram (regs) van die deursnee van die gepoleerde en daaropvolgende geëtste oppervlak van hierdie monster. Kies die mees korrekte stelling. Vertaling:  Microscope lens = Mikroskoop lens; Polished = gepoleer; Etched = geëts; Cementite = sementiet; Ferrite = ferriet.

 

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Order the steel microstructures according to increasing hardness.

Rangskik die staal mikrostrukture volgens toenemende hardheid.

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Indicate which microstructures will appear after each induction hardening process step:

Dui aan watter mikrostrukture sal na elke induksieverhardings prosesstap verskyn:

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