|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||F-6: Design of Ultra-high-strength Fe-Cr-Mn-Ni-N-C Stainless Steels with Enhanced Ductilities
||Marco Wendler, Michael Hauser, Olena Volkova, Javad Mola
|On-Site Speaker (Planned)
High-interstitial austenitic stainless steels with insufficient mechanical stabilities and poor tensile properties at room temperature were made ultra-high-strength by thermal or thermo-mechanical treatments. The thermal treatment was similar to Quenching and Partitioning (Q&P) processing but involved subzero treatment in the quenching step to obtain a partially martensitic microstructure. For steels with very low martensite start temperatures in which the required fraction of martensite could not be obtained by a subzero treatment, plastic deformation at -40 °C was used to induce martensite. Martensitic-austenitic steels obtained by the preceding methods were subsequently heat treated at 450 °C to temper the existing martensite and allow for the partial diffusion of carbon and nitrogen to the co-existing austenite. For the Q&P-treated variant, the yield strength, tensile strength, and total elongation at room temperature were 1050 MPa, 1550 MPa, and 22%, respectively. The enhanced ductility was due to the raised stability of the remaining austenite.
||Planned: Supplemental Proceedings volume