Effect_On_The_Formation_Of_Pearlite_And_Bainite_During_The_I

Effect On The Formation Of Pearlite And Bainite During The Isothermal Transformation Effect on the formation of pearlite and bainite during the isothermal transformation All alloying elements except Co delay the formation of ferrite and cementite. It is very difficult to formulate any general rules regarding the influence exerted by the various alloying elements. However, it has definitely been found that some elements affect the bainite transformation more than the pearlite transformation, while other elements act in the opposite manner. Certain elements will, paradoxically, accelerate the transformations if their concentration increases beyond a certain limiting value, this limit been affected by other alloying elements present. For case-hardening and tool steels the time taken to initiate the pearlite-bainite transformation is reduced as the carbon content exceeds about 1%. For tool steels and constructional steels Si-concentrations of 1,5% and above have been found to promote pearlite formation. As a general principle it may be stated that by increasing the concentration of one alloying element by some few percent and the basic carbon content being kept about 0,50%, only a relatively small retardation of the transformation rates is noticed. For plain carbon steels a successive increase in C from 0,30% to elements, transformation, steel, alloying, pearlite, time, steels, been, bainite, various, one, formation, certain, carbon, about, tool, temperatures, quenching, increasing, however, general, found, figure, effect, curves, content, concentration, zero, while, water, view, very, value, undissolved, transformations