Comments on: Tempering of Martensite http://bainite.wordpress.com/2008/03/20/tempering-of-martensite/ it's not pearlite or martensite. Wed, 23 Jul 2008 12:22:26 +0000 http://wordpress.org/?v=MU By: Mathew http://bainite.wordpress.com/2008/03/20/tempering-of-martensite/#comment-9741 Mathew Tue, 29 Apr 2008 13:45:11 +0000 http://bainite.wordpress.com/?p=204#comment-9741 I don't think it's true that we will always get bainite during stage 2 tempering. The TTT diagram is for transformation from austenite, once transformed to martensite the starting microstructure will have an effect. It might be possible that some of these steels will form bainite, but I myself haven't seen (but havent looked for!) the experimental evidence. Looking for surface relief caused by the displacive transformation might be one thing to do, but this experiment should also probably be done in a dilatometer so that it is possible to distinguish bainite from any martensite that forms upon the cooling from the tempering temperature. I don’t think it’s true that we will always get bainite during stage 2 tempering. The TTT diagram is for transformation from austenite, once transformed to martensite the starting microstructure will have an effect. It might be possible that some of these steels will form bainite, but I myself haven’t seen (but havent looked for!) the experimental evidence.

Looking for surface relief caused by the displacive transformation might be one thing to do, but this experiment should also probably be done in a dilatometer so that it is possible to distinguish bainite from any martensite that forms upon the cooling from the tempering temperature.

]]> By: Jim http://bainite.wordpress.com/2008/03/20/tempering-of-martensite/#comment-9737 Jim Fri, 25 Apr 2008 17:08:02 +0000 http://bainite.wordpress.com/?p=204#comment-9737 during stage 2 the retained austenite should become banite, not just decompose into ferrite and cementite,check the TTT diagrams for isothermal transformations of hypoeuectoid steels during stage 2 the retained austenite should become banite, not just decompose into ferrite and cementite,check the TTT diagrams for isothermal transformations of hypoeuectoid steels

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