Nanoscale austenite reversion through partitioning, segregation and kinetic freezing: Example of a d
By Lichao Yuan, D. Ponge, J. Wittig, P. Choi, J. L. Jimenez, Dierk Raabe. 2012
194 citations recorded by the source corpus.
Austenite reversion during tempering of a Fe–13.6 Cr–0.44 C (wt.%) martensite results in an ultra-high-strength ferritic stainless steel with excellent ductility. The austenite reversion mechanism is coupled to the kinetic freezing of carbon during low-temperature partitioning at the interfaces between martensite and retained austenite and to carbon segregation at martensite–martensite grain boundaries. An advantage of austenite reversion is its scalability, i.e. changing tempering time and temperature tailors the desired strength–ductility profiles (e.g. tempering at 400 C for 1 min produces a 2 GPa ultimate tensile strength (UTS) and 14% elongation while 30 min at 400 C results in a UTS of � 1.75 GPa with an elongation of 23%). The austenite reversion process, carbide precipitation and carbon segregation have been characterized by X-ray diffraction, electron back-scatter diffraction, transmission electron microscopy and atom probe tomography in order to develop the structure–property relationships that control the material’s strength and ductility.
Subfields: Biomedical Engineering, Mechanical Engineering, Metals and Alloys
View Paper: https://www.semanticscholar.org/paper/767791096e51d14a5dea10973745cd8b9257bac3
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Citations in the corpus
- An Overview of Dual-Phase Steels: Advances in Microstructure-Oriented Processing and Micromechanically Guided Design (2015, background): “The strength of this design strategy had been previously demonstrated for different steels (17, 119).”
- Grain boundary segregation engineering in metallic alloys: A pathway to the design of interfaces (2014, unknown): “that C decoration to GBs is an essential principle behind the stabilization of nanocrystalline grains and sub-grains and its resulting effects on the strength of heavily deformed pearlitic steel wires [75,76,122,123] and martensite [71].”