How To Read Ttt Diagram

After about a tenth of a second 10 1 s the transformation is practically finished. Time temperature transformation ttt curves ttt diagram is a plot of temperature versus the logarithm of time for a steel alloy of definite composition.

Time Temperature Transformation Ttt Diagram Powerpoint Slides

Time temperature transformation ttt diagram duration.

How to read ttt diagram. Byamr abdeen help us caption. If we repeat the experiment at a temperature around 480 oc. At the nose temperature fine pearlite and upper bainite form simultaneously though the mechanisms of their formation are entirely different.

Introduction to materials science and engineering 24917 views. Explaination of ttt diagram material science part 1 if the voice isnt clear to you please use captions in the play bar. At high temperature while underlooling is low form coarse pearlite.

Therefore ttt diagram consists of different isopercentage lines of which 1 50 and 99 transformation lines are shown in the diagram. Like phase diagrams once more ttt or cct diagrams are easy to read after you learned a few rules but not so easy to calculate. Indicates the amount of transformation at a constant temperature.

Transformation diagrams time temperature transformation ttt diagrams 1. Ttt diagrams have time on the x axis and temperature on the y axis. Like phase diagrams ttt and ctt diagrams provide a kind of map that enables you to get oriented in the wilderness of steel alloys structures processes and properties.

Sometimes the lines are labeled with percentages which represent the percentage of the material that has transformed. The lines on a ttt diagram represent points at which a material transforms from one phase or microstructure to another. The diagram on the lower left shows this it is directly taken from the figure above the ttt diagram and usually not included.

Ttt diagram indicates a specific transformation starts and ends and it also shows what percentage of transformation of austenite at a particular temperature is achieved. Samples are austenitised and then cooled rapidly to a lower temperature and held at that temperature whilst the amount of transformation is measured.

Ttt Diagrams And Heat Treatment Of Steel Metallurgy

Ttt Diagram