The austenitic stainless steel 304L is widely used as a structural material for which the finished surface has significant effect on the service performance. A study of the grinding process with regard to the quality of the ground surfaces is therefore interesting from the point of view of both industrial application and scientific research. This work investigates the influence of grinding parameters including abrasive grit size, machine power, and grinding lubrication on the surface integrity of the austenitic stainless steel 304L. The induced normal grinding force, grinding surface temperature, metal removal rate, and surface property changes have been investigated and compared. Using grinding, lubrication significantly enhanced the metal removal rate. Surface defects (deep grooves, smearing, adhesive chips, and indentations), a highly deformed thin surface layer up to a few microns in thickness, and high surface tensile residual stresses parallel to the grinding direction have been observed as the main damage induced by the grinding operations. Surface finish and deformation were found to be improved by using smaller abrasive grits or by using lubrication during grinding. Increasing the machine power increased surface deformation while reducing surface defects. The results obtained can provide a reference for choosing appropriate grinding parameters when machining 304L; and can also help to understand the failure mechanism of ground austenitic stainless steel components during service.

中文翻译：

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不同研磨操作后奥氏体304L不锈钢的表面特性

奥氏体不锈钢304L广泛用作结构材料，其精加工表面对使用性能有重大影响。因此，从工业应用和科学研究的角度来看，关于磨削表面质量的研究是有趣的。这项工作研究了研磨参数（包括磨料粒度，机器功率和研磨润滑）对奥氏体304L不锈钢表面完整性的影响。研究并比较了感应法向磨削力，磨削表面温度，金属去除率和表面性能变化。通过研磨，润滑显着提高了金属去除率。表面缺陷（深沟槽，污迹，粘性芯片和压痕），已经观察到，高度变形的薄表面层厚度可达几微米，并且平行于磨削方向的高表面拉伸残余应力是磨削操作引起的主要破坏。发现通过使用较小的磨料或在研磨过程中使用润滑可以改善表面光洁度和变形。增加机器功率会增加表面变形，同时减少表面缺陷。所得结果可为加工304L时选择合适的磨削参数提供参考；并且还可以帮助您了解维修过程中地面奥氏体不锈钢部件的失效机理。观察到与磨削方向平行的高表面拉伸残余应力是磨削操作引起的主要破坏。发现通过使用较小的磨料或在研磨过程中使用润滑可以改善表面光洁度和变形。增加机器功率会增加表面变形，同时减少表面缺陷。所得结果可为加工304L时选择合适的磨削参数提供参考；并且还可以帮助您了解维修过程中地面奥氏体不锈钢部件的失效机理。观察到与磨削方向平行的高表面拉伸残余应力是磨削操作引起的主要破坏。发现通过使用较小的磨料或在研磨过程中使用润滑可以改善表面光洁度和变形。增加机器功率会增加表面变形，同时减少表面缺陷。所得结果可为加工304L时选择合适的磨削参数提供参考；并且还可以帮助您了解维修过程中地面奥氏体不锈钢部件的失效机理。所得结果可为加工304L时选择合适的磨削参数提供参考；并且还可以帮助您了解维修过程中地面奥氏体不锈钢部件的失效机理。所得结果可为加工304L时选择合适的磨削参数提供参考；并且还可以帮助您了解维修过程中地面奥氏体不锈钢部件的失效机理。