| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Austenite Decomposition during Hot Strip Rolling of a X70 Line Pipe Steel |
| Author(s) |
Smit Patel, Sabyasachi Roy, Matthias Militzer, Warren Poole |
| On-Site Speaker (Planned) |
Smit Patel |
| Abstract Scope |
Pipelines are pivotal for transportation of oil and natural gas. Niobium is a microalloying element added to line pipe steels to promote superior mechanical properties through complex microstructural formation. Line pipe steels are thermo-mechanically controlled processed (TMCP) hot rolled products. In this study, the austenite decomposition kinetics during continuous cooling of a X70 line pipe steel was investigated using a Gleeble 3500 thermomechanical simulator equipped with a Laser Ultrasonics for Metallurgy (LUMet) system. The influence of different parameters relevant for TMCP including austenite grain size, cooling rate, retained strain and different states of Niobium (in solution, precipitated) on transformation kinetics and the transformation products were examined. The austenite to ferrite/bainite transformation temperature decreased with increasing cooling rates, larger austenite grain size and smaller retained strain. The hardness increased linearly with decrease in 50% transformation temperature. |