About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VI
|
Presentation Title |
Correlation of Crack Propagation with Mechanical Properties of Parent Phases and Softened Phases in Bearing Steels under Rolling Contact Fatigue |
Author(s) |
Eunji Song, Hansol Jeon, Ju-Young Kim |
On-Site Speaker (Planned) |
Eunji Song |
Abstract Scope |
Bearing steels are components used under rolling contact fatigue. Even though rolling contact transfers stress less than yield strength, crack propagation is observed after rolling contacts more than hundreds of thousands. It was reported that decrease of micro-hardness and transition of martensite phases to tempered and ferrite phases are observed with increasing rolling cycles. The widely known cause for decrease of micro-hardness and microstructure transition is dislocation-assisted carbon migration, which is called as mechanical tempering. Here, we focused on disparity of mechanical properties between parent phases and softened phases as a cause for strain concentration.
In this study, tensile properties of constituent phases and crack phenomenon are estimated on S<sub>55</sub>Cr after 0, 5*10<sup>3</sup>, 5*10<sup>4</sup>, 5*10<sup>5</sup>, and 5*10<sup>7</sup> cycles of rolling contact fatigue. We discuss disparity in mechanical properties between parent phases and softened phases and crack nucleation sites with increasing rolling cycles. |
Proceedings Inclusion? |
Planned: |