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?

Question

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?

Accepted Answer

50% Bainite and 50% Martensite / 50% Bainiet and 50% Martensiet

Answer

50% Pearlite + 50% Bainite / 50% Perliet + 50% Bainiet

Answer

100% Bainite/ 100% Bainiet

Answer

100% Martensite / 100% Martensiet

Crowdly

A small specimen has been subjected to the following time–temperature treatment....

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