ORAL

SESSION: AdvancedMaterialsMonAM-R6	Marquis International Symposium on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development(3rd Intl Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development)
Mon Oct, 23 2017	Room: Condesa IA
Session Chairs: Jan Seidel; S. Ravi P. Silva; Session Monitor: TBA

12:00: [AdvancedMaterialsMonAM03]
Effect of Heat Treatment Paths on the Microstructure and Mechanical Properties of High Cr Containing Ultrahigh Strength Steels
G.bae Park¹ ; Yunik Kwon¹ ; K.h. Kwon² ; Nack Kim¹ ; ¹POSTECH, Pohang, Korea (Republic of [South] Korea); ²RIST, Pohang, Korea (Republic of [South] Korea);
Paper Id: 112 [Abstract]

Ultrahigh-strength steels are needed in many demanding applications including aircraft landing gears. For such applications, the steels should have high strength, high fracture toughness, and high-stress corrosion cracking resistance. However, most of the commercial alloys such as 4340, 300M, and AerMet100 generally have poor corrosion resistance and require the use of cadmium coating to prevent corrosion, which raises serious problem during maintenance. For the steels to have excellent corrosion resistance, a fairly large amount of Cr is needed in the alloy composition. However, high Cr content in the steels can cause serious problems such as degraded fracture toughness and corrosion resistance due to a possible formation of Cr-containing particles along grain boundaries. In the present study, Fe-Cr-0.2C steels with other additional alloying elements have been subjected to various heat treatment paths such as quenching and tempering (Q&T), quenching and partitioning (Q&P), and austempering. The microstructure has been analyzed by detailed TEM studies and correlated with mechanical properties including stress corrosion cracking resistance for a selected steel.