|About this Abstract
|MS&T22: Materials Science & Technology
|Steels for Sustainable Development
|Microstructural Engineering of High Mn Duplex Steel to Achieve Low-cost, High-performance Solutions for Hydrogen Storage and Delivery
|Yuran Kong, Allison Kosberg, Pawan Kathayat, Lawrence Cho, Kip O. Findley , John G. Speer
|On-Site Speaker (Planned)
The cost and reliability of hydrogen storage and delivery infrastructure represent primary obstacles to the broader use of hydrogen energy technologies. In particular, high Ni austenitic stainless steels have high resistance to hydrogen embrittlement but are relatively costly. To overcome this obstacle, the current study aims at designing Mn-alloyed duplex steels as economical alternatives to high Ni stainless steels for hydrogen service. The alloy design was guided by previously understood effects of alloying on austenite stacking fault energy, which is correlated with the mechanical stability of austenite and hydrogen embrittlement resistance. In the hot-rolled condition, the designed duplex steel showed superior hydrogen embrittlement resistance compared to the commercial 255 duplex stainless steel. The hydrogen embrittlement properties of the designed alloy were also evaluated in cold rolled and aged conditions. The microstructure-driven hydrogen distribution and deformation mechanisms in both the high Mn and stainless steels were characterized through fractographic analyses.