What is the difference between diagrams of IT and CT in heat treatment of steels?
Submitted by: AdministratorIsothermal Transformation (IT) and Continuous Transformation (CT) diagrams are diagrams used to investigate kinetic aspect of phase transformations and are of extensive use in steels heat treatment. In these diagrams generally called Time-Temperature-Transformation (TTT), the abscissa is time in logarithmic scale and ordinate is temperature. The C shaped curves indicate the onset and the end of diffusion (civilian) transformations e.g. pearlite or bainite formation or precipitation of carbides.
IT diagram shows what happens when steel is held at a constant temperature for a prolonged period. The development of the microstructure with time can be followed by holding small specimens in a lead or salt bath and quenching them one at a time after increasing holding times and measuring the amount of phases formed in the microstructure with the aid of a microscope. An alternative method involves using a single specimen and a dilatometer, which records the elongation of the specimen as a function of time. The basis for the dilatometer method is that the micro constituents undergo different volumetric changes and thus, the onset of transformations could be detected.
Submitted by: Administrator
IT diagram shows what happens when steel is held at a constant temperature for a prolonged period. The development of the microstructure with time can be followed by holding small specimens in a lead or salt bath and quenching them one at a time after increasing holding times and measuring the amount of phases formed in the microstructure with the aid of a microscope. An alternative method involves using a single specimen and a dilatometer, which records the elongation of the specimen as a function of time. The basis for the dilatometer method is that the micro constituents undergo different volumetric changes and thus, the onset of transformations could be detected.
Submitted by: Administrator
Read Online Metallurgy Job Interview Questions And Answers
Top Metallurgy Questions
☺ | What is Iron Ferrite, what is it used for, and where is it found? |
☺ | What is the different between ferrite percentage and ferrite number? |
☺ | Why is Chromium Molybdenum steels used to build pressure vessels? What is special about the properties of Chromium Molybdenum steels that make them ideal for pressure vessels? |
☺ | What is the metallurgical explanation of effects of chromium, nickel, molybdenum, and carbon in stainless steels? |
☺ | What are the properties and application of manganese steel? |
Top School Education Categories
☺ | Mathematics Interview Questions. |
☺ | GMAT Interview Questions. |
☺ | Metallurgy Interview Questions. |
☺ | Polio Eradication Officer Interview Questions. |
☺ | Physical Education Interview Questions. |