ABSTRACT

Roller burnishing process is a post-machining surface finishing technique that has an advantage over other finishing processes, such as shot blasting or abrasive-tooling processes, because of its simplicity and excellent results (both improved surface finish and improving the mechanical properties of the material). Roller burnishing allows you to eliminate the part grinding step. Nickel super alloys, in turn, including the Inconel 718 have wide application in the aerospace industry due to their high fatigue strength and their ability to work at elevated temperatures. The Inconel 718 shows a predominantly austenitic matrix (γ phase), which under the burnishing process trends to produce an increase in hardness and residual stress. This paper is the result of research on the influence of the conventional roller rolling process at room temperature and at 310°C on a turned part of Inconel 718. Results of surface roughness, roundness deviation, microhardness, residual stress, and deformation of the material under a load of 850 N were analyzed. The obtained results prove the improvement of the material properties after the roller burnishing process: lower values of surface roughness, higher roundness deviation in conventional burnishing, higher surface hardness and higher compressive residual stress in hot burnished specimen.

摘要

滚压抛光工艺是一种后加工表面精加工技术，与其他精加工工艺（如抛丸或磨料加工工艺）相比具有优势，因为它简单且效果极佳（既能改善表面光洁度，又能改善材料的机械性能） ）。滚轮抛光可让您省去零件磨削步骤。反过来，镍超级合金（包括 Inconel 718）由于其高疲劳强度和在高温下工作的能力而在航空航天工业中得到广泛应用。Inconel 718 显示主要是奥氏体基体（γ 相），在抛光过程中会导致硬度和残余应力增加。本文是对 Inconel 718 车削件在室温和 310°C 下常规滚轧工艺影响的研究结果。 材料的表面粗糙度、圆度偏差、显微硬度、残余应力和变形结果在 850 N 的负载下进行了分析。所得结果证明滚光抛光后材料性能得到改善：表面粗糙度值更低，常规抛光的圆度偏差更大，热抛光试样的表面硬度更高，压缩残余应力更高。