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Keynote Lecture

WEB Superior toughness achieved by grain boundary delamination in a 2GPa steel

Tuesday (22.09.2020)
10:10 - 10:40 S: Structural Materials 1
Part of:

High-performance steel with ultrahigh strength and excellent toughness are important structural materials for various engineering applications. Unfortunately, increasing strength will lead to the decrease of fracture toughness. In particular, it is extremely difficult to archive excellent fracture toughness when the yield strength of steels reach a level of 2 GPa. The present talk discusses a recent breakthrough deformed and partitioned (D&P) steel that obtains an ultrahigh yield strength of ~ 2GPa and a fracture toughness of 101.5 MPa·m½. The ultrahigh yield strength is obtained by its ultrahigh dislocation density. The excellent fracture toughness is mainly achieved by activating multi-delamination at prior austenite grain boundaries where Mn segregation occurs. Segregation of Mn at prior austenite grain boundaries makes the boundaries weaker than the grain interior. In addition, the flow stress is high enough to active the grain boundary delamination. The proposed “high-strength induced multi-delamination” strategy provide a new way to develop alloys with ultra-high strength and superior toughness

Prof. Mingxin Huang
The University of Hong Kong