Turning is a machining process extensively applied to produce revolution parts. Durability of these parts are known to depend on the turning process signature that is often referred as surface integrity. The surface integrity generated in a fillet radius has been barely studied in the literature so far, despite the well-known geometrical stress concentration factor of such singularities. Therefore this paper deals with the investigation of machining-induced surface integrity when turning a fillet radius in a 316L austenitic stainless steel. Different characterization methods are used for that purpose - SEM, EBSD, nanoindentation and X-Ray diffraction. It points out that the turning-induced consequences are not homogeneous along the machined profile. Residual stresses are strongly affected and microstructure is highly modified over a depth of 80 μm that leads to a mechanical properties gradient. It is evidenced that the average uncut chip thickness is the main governing parameter regarding surface integrity. It is also reported that deformation twins appear in the affected zone. It highlights that turning-induced microstructure evolution at a given depth is rather a consequence of severe plastic deformation at high strain rate than dynamic recrystallization.

车削是一种广泛应用于生产旋转零件的加工工艺。众所周知，这些零件的耐用性取决于车削过程特征，通常称为表面完整性。尽管这种奇点的几何应力集中因子众所周知，但迄今为止，文献中几乎没有研究过圆角半径中生成的表面完整性。因此，本文研究了在 316L 奥氏体不锈钢中车削圆角半径时加工引起的表面完整性。为此使用了不同的表征方法 - SEM、EBSD、纳米压痕和 X 射线衍射。它指出车削引起的后果沿着加工轮廓是不均匀的。残余应力受到强烈影响，微观结构在 80 μm 的深度上发生高度变化，导致机械性能梯度。事实证明，平均未切削切屑厚度是有关表面完整性的主要控制参数。据报道，变形孪晶出现在受影响的区域。它强调了给定深度的车削诱导的微观结构演变是高应变率下严重塑性变形的结果，而不是动态再结晶。