Thanks for the sharing of shear localization.
From literature, adiabatic shear bands could cause transformation from ferrite to austenite.
However, I still can not figure out what makes these bands cooling so quickly that result in martensite.
The raw material is 5 cm in diameter and about 10 cm...
The other attachment is as below.
Sorry that I am new guy here and not familiar with posting procedure.
http://files.engineering.com/getfile.aspx?folder=e8f2f439-b639-4ebc-88a2-07d69f2bcd95&file=1.jpg
Dear all,
Recently I got an analysis case on a forged product made of 4140.
The sample was first induction heated to 950 degree C for about 3.5 minutes and then air cooled after forging.
Material flow, which looks like white bands, are clearly observed after etching.
However, the hardness of...
