AISTech 2022

Si and Pro-Eutectoid Ferrite Effects on Brittle and Ductile Fracture of As-Cast Advanced High-Strength Steel Slab (Room 310)

17 May 22
2:30 PM - 3:00 PM

Tracks: Metallurgy - Processing, Products & Applications

Speaker(s): Thinium Natarajan, U. S. Steel Research and Technology Center; P. Chris Pistorius, POSCO Professor of Materials Science & Eng., Carnegie Mellon University; Andrea Bollinger, Post-Doctoral Researcher, Carnegie Mellon University; Bryan Webler, Professor, Carnegie Mellon University

Elevated Si levels are linked to embrittlement of as-cast AHSS slabs during cooling, possibly related to the formation of pro eutectoid ferrite (αPE) and resulting changes in DBTT. 3 Point Bend tests were conducted on as cast, AHSS ingots with 3.0 and 1.0 wt% Si (with and without αPE, respectively). Tests were performed at room temperature to determine the brittle fracture stress. Additional tests were conducted at 300 ˚C at multiple strain rates in order to investigate a suspected mechanism of strain localization within αPE. Improved understanding of the failure mechanism may allow alterations in compositions and processing to avoid low-temperature slab cracking.