Investigation about anomalous phase transformation behavior induced by surface severe plastic deformation

研究了Fe-Ni合金喷丸变形诱导层的形成机理和喷丸诱发反常逆相变的机理。在本研究中，我们发现Fe-Ni合金中的形变诱导层是由于剧烈的剪切变形导致晶粒细化并形成剪切带而产生的。此外，还发现，由于晶粒细化而使奥氏体稳定化是喷丸诱发反常逆相变的原因之一。

Formation mechanism of deformation-induced layer and mechanism of anomalous reverse transformation induced by shot-peening for Fe-Ni alloys are investigated. In this study, we found that the deformation-induced layer in the Fe-Ni alloys is generated by grain refinement with the formation of shear band due to severe shear deformation. In addition, it was found that the stabilization of austenite due to grain refinement is one of the reasons of the anomalous reverse transformation induced by the shot-peening.