Effect of Pre-Annealing Microstructure on Degree of Spheroidization

Medium-carbon steels with various heat treatment processes are widely used in fastener or CHQ application. Typically, medium-carbon steels have a carbon range of 0.25 to 0.65% by weight. AISI 1541 grade with high manganese is taken to study the spheroidization rate with different input microstructure: fine and coarse pearlite, bainite and martensite. In fine pearlite, the cementite lamellae are thinner, whereas in martensite and bainite, cementide spheres are more dispersed. So, dissolution and breakdown of these lamellae occur in a shorter time in unstable microstructure than stable microstructure of pearlite. The study indicates better spheroidization in unstable microstructure.

Authors:

Mr Mohammed Rasul Iqbal | JSW Steel Ltd.
 

Mr Chakaravarthy K | JSW Steel Ltd.
 

Manjini Sambandam | JSW Steel Ltd.
 

Session Chairs:

Siddhartha Biswas | Big River Steel
 

Nilesh Kumar | University of Alabama
 

Vignesh Nallasivam | Tata Steel International (Americas) Inc.