|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Advanced High-strength Steels
||G-4: Effect of Reheating Temperature and Cooling Treatment on the Microstructure, Texture and Impact Transition Behavior of Heat Treated Naval Grade HSLA Steel
||Md. Basiruddin Sk., Abhijit Ghosh, Nirmalya Rarhi, R. Balamuralikrishnan, Debalay Chakrabarti
|On-Site Speaker (Planned)
||Md. Basiruddin Sk.
In order to achieve the desired mechanical properties (YS > 390 MPa, total elongation > 16% and Charpy impact toughness of 78 J at -60°C) for naval application, samples from a low-carbon microalloyed steel have been subjected to different austenitization (950-1250°C) and cooling treatments (furnace, air or water cooling). The as-rolled steel and the sample air cooled from 950°C could only achieve the required tensile properties, whilst the sample furnace cooled from 950°C showed the best Charpy impact properties. Water quenching from 950°C certainly contributed to the strength but affected the impact toughness. Overall, predominantly ferrite matrix with fine effective grain size and intense gamma fibre texture was found to be beneficial for impact toughness as well as impact transition behavior. Small size and fraction of precipitates (like TiN, Nb and V carbonitrides) eliminated the possibility of particle controlled crack propagation and grain controlled crack propagation led to cleavage fracture.
||Planned: Supplemental Proceedings volume