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Materials Science A / Materiaalkunde A - 214

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Phase formed from a diffusionless reaction:

Fase wat deur 'n diffusielose reaksie gevorm word:

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For the Continuous-Cooling Transformation diagram below, select the correct statement:

Vir die Deurlopende-Verkoelingstransformasie diagram hieronder, kies die korrekte stelling:

 

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A small specimen has been subjected to the following time–temperature treatment. Assume that the specimen begins at 760°C (1400°F) and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. The specimen has been cool rapidly to 400°C (750°F), held for 20 s, then quenched to room temperature. What is the nature of the final microstructure?

'n Klein monster is aan die volgende tyd-temperatuurbehandeling onderwerp. Aanvaar dat die monster begin by 760°C (1400°F) en dat dit lank genoeg by hierdie temperatuur gehou is om 'n volledige en homogene austenitiese struktuur te verkry. Die monster is vinnig afgekoel tot 400°C (750°F), daar gehou vir 20 sekondes en daarna tot kamertemperatuur geblus. Wat is die aard van die finale mikrostruktuur?

 

Figure 12.22

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Match the following time-temperature paths on the isothermal transformation diagram for a 1.13 wt% C alloy with the corresponding resulting microstructure that forms. Note: the time-temperature paths are drawn in thick black lines. (In an assessment, you could be asked to also draw these types of paths and not just choose them). 

Pas die volgende tyd-temperatuur paaie op die isotermiese transformasiediagram vir 'n 1.13 gew% C allooi met die ooreenstemmende resulterende mikrostruktuur wat vorm. Let wel: die tyd-temperatuur paaie word in dik swart lyne geteken. (In 'n assessering kan u gevra word om ook hierdie tipe paaie te teken en nie net kies nie).

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Choose the right term from the drop-down list. / Kies die regte term uit die aftreklys.

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A 10 kg mass of 1.16 wt% C steel alloy (balance is iron) is cooled slowly from 1 100 °C to just below the eutectoid isotherm at around 725 °C (you can therefore use the solubility limits labelled on the eutectoid isotherm). At this point, how much of the mass of the alloy consists of proeutectoid phase? Give your answer to 3 significant figures. Remember to select the correct units. 

'n 10 kg massa van 1.16 wt% C staalallooi (balans is yster) word stadig afgekoel van 1 100 °C tot net onder die eutektoïede isoterm by ongeveer 725 °C (u kan dus die oplosbaarheidslimiete gebruik wat op die eutektoïede isoterm gemerk is). By hierdie punt, hoeveel van die massa van die allooi bestaan ​​uit proeutektoïede fase? Gee jou antwoord op 3 beduidende syfers. Onthou om die regte eenhede te kies.

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Based on the microstructure and alloy compositions of the previous questions, what are these alloys classified as? 

Gebaseer op die mikrostruktuur en allooisamestellings van die vorige vrae, as wat word hierdie allooie geklassifiseer?

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A 10 kg mass of 1.08 wt% C steel alloy (balance is iron) is cooled slowly from 1 100 °C to just below the eutectoid isotherm at around 725 °C (you can therefore use the solubility limits labelled on the eutectoid isotherm). At this point, how much of the mass of the alloy consists of cementite? Give your answer to 3 significant figures. Remember to select the correct units. 

'n 10 kg massa van 1.08 wt% C staalallooi (balans is yster) word stadig afgekoel van 1 100 °C tot net onder die eutektoïede isoterm by ongeveer 725 °C (u kan dus die oplosbaarheidslimiete gebruik wat op die eutektoïede isoterm gemerk is). By hierdie punt, hoeveel van die massa van die allooi bestaan ​​uit sementiet? Gee jou antwoord op 3 beduidende syfers. Onthou om die regte eenhede te kies.

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A 10 kg mass of 1.15 wt% C steel alloy (balance is iron) is cooled slowly from 1 100 °C to just below the eutectoid isotherm at around 725 °C (you can therefore use the solubility limits labelled on the eutectoid isotherm). At this point, how much of the mass of the alloy consists of ferrite? Give your answer to 3 significant figures. Remember to select the correct units. 

'n 10 kg massa van 1.15 wt% C staalallooi (balans is yster) word stadig afgekoel van 1 100 °C tot net onder die eutektoïede isoterm by ongeveer 725 °C (u kan dus die oplosbaarheidslimiete gebruik wat op die eutektoïede isoterm gemerk is). By hierdie punt, hoeveel van die massa van die allooi bestaan ​​uit ferriet? Gee jou antwoord op 3 beduidende syfers. Onthou om die regte eenhede te kies.

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A 10 kg mass of 1.15 wt% C steel alloy (balance is iron) is cooled slowly from 1 100 °C to just below the eutectoid isotherm at around 725 °C (you can therefore use the solubility limits labelled on the eutectoid isotherm). At this point, how much of the mass of the alloy consists of pearlite? Give your answer to 3 significant figures. Remember to select the correct units. 

'n 10 kg massa van 1.15 wt% C staalallooi (balans is yster) word stadig afgekoel van 1 100 °C tot net onder die eutektoïede isoterm by ongeveer 725 °C (u kan dus die oplosbaarheidslimiete gebruik wat op die eutektoïede isoterm gemerk is). By hierdie punt, hoeveel van die massa van die allooi bestaan ​​uit perliet? Gee jou antwoord op 3 beduidende syfers. Onthou om die regte eenhede te kies.

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