Atom probe tomography and numerical study of austenite stabilization in a low carbon low alloy steel processed by two-step intercritical heat treatment

作者：Xie, Z. J.; Shang, C. J.^*; Subramanian, S. V.; Ma, X. P.; Misra, R. D. K.

来源：Scripta Materialia, 2017, 137: 36-40.

DOI：10.1016/j.scriptamat.2017.05.002

• Atom probe tomography
• Interctitical heat treatment
• Partitioning of carbon and manganese
• Austenite stabilization
• Thermodynamic numerical simulation

Film-like retained austenite with a volume fraction of similar to 10% was obtained in a Fe-0.08C-0.5Si-2.4Mn-0.5Ni (wt%) steel via a two-step intercritical treatment. The retained austenite exhibited ultra-high stability even on cooling to -100 degrees C. Atom probe tomography indicated notable enrichment of C (0.43 wt%) and Mn (6.6 wt) in retained austenite. The ultra-high stability of austenite in low carbon low alloy steel is attributed to the combination of partitioning of C and Mn to austenite and the size effect of ultrafine austenite based on thermodynamic analysis. It is underscored that controlled growth of reverted austenite is important for austenite stabilization.

• 出版日期2017-8
• 单位北京科技大学