Enhancement of surface integrity by cryogenic diamond burnishing toward the improved functional performance of the components

Abstract

17-4 precipitation-hardenable (PH) stainless steel is one of the widely used materials in various applications of engineering practices owing to their excellent corrosion resistance and high strength. The components such as automotive body, aerospace compressor blades, turbine blades and molds demand higher load carrying capacity and improved fatigue strength, which is possible to achieve by surface severe plastic deformation. Diamond burnishing process is an appropriate technique to produce such components which improves the surface integrity characteristics of the material. This article presents a comprehensive examination of the surface integrity of cryogenic diamond burnished 17-4 PH stainless steel using a novel diamond burnishing tool. The impact of diamond burnishing control factors on subsurface microhardness, surface roughness, surface hardness, surface topography, residual stress and surface morphology has been analyzed. The optimal control factor setting ensures the least surface roughness of 0.03 µm by the application of one factor at a time approach. Cryogenic diamond burnished surface achieves the exceptional surface finish and the surface hardness in tool-tip of 8 mm and 6 mm, respectively. The maximum surface hardness of 413 HV was attained using 6-mm tool-tip diameter. The subsurface microhardness improvement of 2% and 4% has been observed while using a tool-tip diameter of 6 mm in contrast to 8 mm and 10 mm. Compressive residual stresses have been generated at the top surface layer of the specimen. The attained experimental results prove that cryogenic diamond burnishing can be successfully applied to 17-4 PH stainless steel to enhance its surface integrity characteristics.

Influence of slide burnishing process on the surface characteristics of precipitation hardenable steel

“…If the feed was increased further way beyond this limit a sudden increase in the surface roughness has been noticed. It is because the gap amongst the successive traces of the tool tip is small at lower feed and at higher feed more gap will be available among the successive traces of the tool which causes a sudden increase in the surface roughness of the specimen [29,30]. The results of the slide burnishing process will be affected by the variation of burnishing force as depicted in Figs.…”

Effect of slide burnishing on the corrosion resistance and surface roughness on high strength steels

“…33–35 However, there is an optimum burnishing force that will lead to the highest roughness reduction for each material, but an excessive high burnishing force can cause deterioration of the material surface finish. 36–40 For DP-330Y material, the lowest result of Ra, Rz, Rt, and Rp indicators were obtained with the burnishing force of 150 N, while the Rv indicator decreased even more with an increase of the burnishing force. For the burnishing force of 150 N, the roughness indicators enhanced around 73.4%, 53.8%, 50.2%, 70.6%, and 40.3% for Ra, Rz, Rt, Rp, and Rv, respectively.…”

Effects of Cryogenic- and Cool-Assisted Burnishing on the Surface Integrity and Operating Behavior of Metal Components: A Review and Perspectives

“…Although cryogenic machining [2] has been used since 1968, research on CrAB and CoAB has been performed more recently (2011-2024) and is significantly lower in volume than that dedicated to cryogenic machining. Much research on CrAB has been performed at the University of Kentucky, USA [32][33][34][35][36][42][43][44][45][60][61][62][63][64][65][66], although studies dedicated to CrAB and CoAB by other authors have also been performed worldwide [31,[37][38][39][40][41][46][47][48][49][50][51][52][53][54][55][56][57][58][59]. Studies concerning CrAB and CoAB are systematized and classified in Tables 1 and 2.…”