CreakyFaun64
Materials
- May 30, 2020
- 1
I have ran across an interesting result with some material that I have been doing small scale testing on. In the lab process, the steel sample is brought above austenitizing temperature, quenched to a specific quench temperature with variances in quench rate, and finally either tempered or held isothermally.
During some trials I had noticed that the yield strength that results from the specific heat treatment cycle depends heavily on the quench rate, but not as intuition would lead you to believe. As I have ran through iterations of increasing quench rate, I have consistently recorded lower yield strengths. This is all while still quenching to the same end quench temperature.
My question, would we expect that quenching at a much faster quench rate, avoiding the nose of bainitic formation, and holding though a lower bainite region would result in a lower yield strength than a more gentle curve that moves through upper bainite? If not, would anyone have any other ideas on what phenomena could be behind this?
During some trials I had noticed that the yield strength that results from the specific heat treatment cycle depends heavily on the quench rate, but not as intuition would lead you to believe. As I have ran through iterations of increasing quench rate, I have consistently recorded lower yield strengths. This is all while still quenching to the same end quench temperature.
My question, would we expect that quenching at a much faster quench rate, avoiding the nose of bainitic formation, and holding though a lower bainite region would result in a lower yield strength than a more gentle curve that moves through upper bainite? If not, would anyone have any other ideas on what phenomena could be behind this?
