2019 Pittsburgh AISTech

Effect of Allotriomorphic Ferrite Thickness on Advanced High-Strength Steel Toughness (Room 412)

06 May 19
9:30 AM - 10:00 AM

Tracks: Metallurgy - Processing, Products & Applications

Speaker(s): Bryan Webler, Professor, Carnegie Mellon; Rafael Coura Giacomin, Carnegie Mellon University

Levels of C, Mn and Si in new advanced high-strength steel grades lead to a complex evolution of microstructure during solidification and can lead to slab cracking. This project aims to identify the cause for this cracking, focusing on the effects of chemical composition on microstructure evolution that might lead to defects. Increasing Si (0-3 wt.%) in a 0.2 wt.% C, 3.0 wt.% Mn steel increases the amount of proeutectoid ferrite upon cooling, increases tensile strength and hardness, and decreases toughness. In this part of the project, isothermal heat treatments were developed to control allotriomorphic ferrite thickness and its impact on steel toughness.