α to γ transformation in the nanostructured surface layer of pearlitic steels near room temperature

作者：Min, Na; Li, Wei; Jin, Xuejun^*

来源：Scripta Materialia, 2008, 59(8): 806-809.

DOI：10.1016/j.scriptamat.2008.05.038

• pearlitic steels
• surface mechanical attrition treatment
• nanocrystalline
• alpha -> gamma transformation

An unusual low-temperature structural transformation from ferrite (alpha) to austenite (gamma) is observed near room temperature through surface mechanical attrition treatment (SMAT) by means of transmission electron microscopy (TEM) and back-scattering Mossbauer spectroscopy (BSMS). Associated with the thermodynamic calculation, two factors that lead to the appearance of austenite after SMAT near room temperature are discussed. One factor is the formation of supersaturated nanocrystalline ferrite. The other is the compression stress at the boundaries of nano-size grains after SMAT.

• 出版日期2008-10
• 单位上海交通大学; 上海大学