How To Read A Ttt Diagram

Cementiteferrite pearlite bainite and martensite. After about a tenth of a second 10 1 s the transformation is practically finished.

Ttt Diagram Wikipedia

P pearlite b bainite and m martensite.

How to read a ttt diagram. Sometimes the lines are labeled with percentages which represent the percentage of the material that has transformed. Similar to ttt diagrams there are different regions for different transformation ie. 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.

One with 04 wt. 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. At high temperature while underlooling is low form coarse pearlite.

At the nose temperature fine pearlite and upper bainite form simultaneously though the mechanisms of their formation are entirely different. Transformation diagrams time temperature transformation ttt diagrams 1. Time temperature transformation diagram for two steels.

Indicates the amount of transformation at a constant temperature. Time temperature transformation ttt curves ttt diagram is a plot of temperature versus the logarithm of time for a steel alloy of definite composition. Therefore ttt diagram consists of different isopercentage lines of which 1 50 and 99 transformation lines are shown in the diagram.

Byamr abdeen help us caption. The lines on a ttt diagram represent points at which a material transforms from one phase or microstructure to another. C red line and one with 04 wt.

Introduction to materials science and engineering 24917 views. 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. If we repeat the experiment at a temperature around 480 oc.

Explaination of ttt diagram material science part 1 if the voice isnt clear to you please use captions in the play bar. Samples are austenitised and then cooled rapidly to a lower temperature and held at that temperature whilst the amount of transformation is measured for example by dilatometry. Time temperature transformation ttt diagram duration.

Cct diagram depends on composition of steel nature of cooling austenite grain size extent of austenite homogenising as well as austenitising temperature and time. The diagram on the lower left shows this it is directly taken from the figure above the ttt diagram and usually not included. C and 2 weight mn green line.

Isothermal transformation diagrams also known as time temperature transformation ttt diagrams are plots of temperature versus time usually on a logarithmic scale. Ttt diagrams have time on the x axis and temperature on the y axis.

Solved 2 Read About The T T T Diagram For Steel And Desc