Influence of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V workpieces with CBN electroplated wheel

Xun Li; Yixuan Wang; Rufeng Xu; Shenliang Yang; Chunming Guan; Yongxin Zhou

doi:10.1007/s00170-019-03345-6

Influence of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V workpieces with CBN electroplated wheel

Xun Li
, Yixuan Wang
, Rufeng Xu^*
, Shenliang Yang
, Chunming Guan
, Yongxin Zhou

^*Corresponding author for this work

Shandong University of Technology
Beihang University

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

High-speed grinding with cubic boron nitride (CBN) electroplated wheels has been widely used in the aviation manufacturing field, such as the machining of nickel-based and titanium alloys. The requirement of dimensional precision and consistency of parts can be met effectively because of the high feasibility and grinding performance of CBN electroplated wheels. Meanwhile, surface integrity has a direct and significant effect on the fatigue behavior of workpieces. Therefore, the influence of surface integrity machined by CBN electroplated wheels on fatigue behavior of Inconel 718 and Ti6Al4V specimens is investigated. Based on the experimental results of surface roughness, microhardening rate, and residual stress measured, low-cycle fatigue tests were carried out to analyze the influence mechanisms of surface integrity on low-cycle fatigue life. Under the given experimental conditions, it can be obtained that surface roughness has predominant and negative effects on the number of cycles to failure (N_f) of Inconel 718 specimens when surface roughness is higher than R_a 0.4 μm. However, when surface roughness is less than R_a 0.3 μm, surface microhardening rate has predominant and positive effects on N_f. Compared with polished specimens, N_f of ground specimens can be increased by 47.5% utilizing the optimized parameters and conditions. As for Ti6Al4V specimens, both surface roughness and microhardening rate have negative effects on N_f. Micro-recast layer and molten drops have been observed on machined surface of Ti6Al4V specimens, which have significant and negative effects on the fatigue behavior of workpieces. At the same time, N_f of ground specimens with CBN electroplated wheels is less than that of milled specimens even utilizing the optimized grinding parameters. From all the comparison results, it can be achieved that the influence mechanisms of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V specimens with CBN electroplated wheels are different due to the material properties.

Original language	English
Pages (from-to)	2345-2356
Number of pages	12
Journal	International Journal of Advanced Manufacturing Technology
Volume	102
Issue number	5-8
DOIs	https://doi.org/10.1007/s00170-019-03345-6
State	Published - 19 Jun 2019

Keywords

Fatigue
Grinding
Inconel 718
Surface integrity
Ti6Al4V

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10.1007/s00170-019-03345-6

Cite this

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title = "Influence of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V workpieces with CBN electroplated wheel",

abstract = "High-speed grinding with cubic boron nitride (CBN) electroplated wheels has been widely used in the aviation manufacturing field, such as the machining of nickel-based and titanium alloys. The requirement of dimensional precision and consistency of parts can be met effectively because of the high feasibility and grinding performance of CBN electroplated wheels. Meanwhile, surface integrity has a direct and significant effect on the fatigue behavior of workpieces. Therefore, the influence of surface integrity machined by CBN electroplated wheels on fatigue behavior of Inconel 718 and Ti6Al4V specimens is investigated. Based on the experimental results of surface roughness, microhardening rate, and residual stress measured, low-cycle fatigue tests were carried out to analyze the influence mechanisms of surface integrity on low-cycle fatigue life. Under the given experimental conditions, it can be obtained that surface roughness has predominant and negative effects on the number of cycles to failure (Nf) of Inconel 718 specimens when surface roughness is higher than Ra 0.4 μm. However, when surface roughness is less than Ra 0.3 μm, surface microhardening rate has predominant and positive effects on Nf. Compared with polished specimens, Nf of ground specimens can be increased by 47.5\% utilizing the optimized parameters and conditions. As for Ti6Al4V specimens, both surface roughness and microhardening rate have negative effects on Nf. Micro-recast layer and molten drops have been observed on machined surface of Ti6Al4V specimens, which have significant and negative effects on the fatigue behavior of workpieces. At the same time, Nf of ground specimens with CBN electroplated wheels is less than that of milled specimens even utilizing the optimized grinding parameters. From all the comparison results, it can be achieved that the influence mechanisms of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V specimens with CBN electroplated wheels are different due to the material properties.",

keywords = "Fatigue, Grinding, Inconel 718, Surface integrity, Ti6Al4V",

author = "Xun Li and Yixuan Wang and Rufeng Xu and Shenliang Yang and Chunming Guan and Yongxin Zhou",

note = "Publisher Copyright: {\textcopyright} 2019, Springer-Verlag London Ltd., part of Springer Nature.",

year = "2019",

month = jun,

day = "19",

doi = "10.1007/s00170-019-03345-6",

language = "英语",

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T1 - Influence of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V workpieces with CBN electroplated wheel

AU - Li, Xun

AU - Wang, Yixuan

AU - Xu, Rufeng

AU - Yang, Shenliang

AU - Guan, Chunming

AU - Zhou, Yongxin

PY - 2019/6/19

Y1 - 2019/6/19

N2 - High-speed grinding with cubic boron nitride (CBN) electroplated wheels has been widely used in the aviation manufacturing field, such as the machining of nickel-based and titanium alloys. The requirement of dimensional precision and consistency of parts can be met effectively because of the high feasibility and grinding performance of CBN electroplated wheels. Meanwhile, surface integrity has a direct and significant effect on the fatigue behavior of workpieces. Therefore, the influence of surface integrity machined by CBN electroplated wheels on fatigue behavior of Inconel 718 and Ti6Al4V specimens is investigated. Based on the experimental results of surface roughness, microhardening rate, and residual stress measured, low-cycle fatigue tests were carried out to analyze the influence mechanisms of surface integrity on low-cycle fatigue life. Under the given experimental conditions, it can be obtained that surface roughness has predominant and negative effects on the number of cycles to failure (Nf) of Inconel 718 specimens when surface roughness is higher than Ra 0.4 μm. However, when surface roughness is less than Ra 0.3 μm, surface microhardening rate has predominant and positive effects on Nf. Compared with polished specimens, Nf of ground specimens can be increased by 47.5% utilizing the optimized parameters and conditions. As for Ti6Al4V specimens, both surface roughness and microhardening rate have negative effects on Nf. Micro-recast layer and molten drops have been observed on machined surface of Ti6Al4V specimens, which have significant and negative effects on the fatigue behavior of workpieces. At the same time, Nf of ground specimens with CBN electroplated wheels is less than that of milled specimens even utilizing the optimized grinding parameters. From all the comparison results, it can be achieved that the influence mechanisms of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V specimens with CBN electroplated wheels are different due to the material properties.

AB - High-speed grinding with cubic boron nitride (CBN) electroplated wheels has been widely used in the aviation manufacturing field, such as the machining of nickel-based and titanium alloys. The requirement of dimensional precision and consistency of parts can be met effectively because of the high feasibility and grinding performance of CBN electroplated wheels. Meanwhile, surface integrity has a direct and significant effect on the fatigue behavior of workpieces. Therefore, the influence of surface integrity machined by CBN electroplated wheels on fatigue behavior of Inconel 718 and Ti6Al4V specimens is investigated. Based on the experimental results of surface roughness, microhardening rate, and residual stress measured, low-cycle fatigue tests were carried out to analyze the influence mechanisms of surface integrity on low-cycle fatigue life. Under the given experimental conditions, it can be obtained that surface roughness has predominant and negative effects on the number of cycles to failure (Nf) of Inconel 718 specimens when surface roughness is higher than Ra 0.4 μm. However, when surface roughness is less than Ra 0.3 μm, surface microhardening rate has predominant and positive effects on Nf. Compared with polished specimens, Nf of ground specimens can be increased by 47.5% utilizing the optimized parameters and conditions. As for Ti6Al4V specimens, both surface roughness and microhardening rate have negative effects on Nf. Micro-recast layer and molten drops have been observed on machined surface of Ti6Al4V specimens, which have significant and negative effects on the fatigue behavior of workpieces. At the same time, Nf of ground specimens with CBN electroplated wheels is less than that of milled specimens even utilizing the optimized grinding parameters. From all the comparison results, it can be achieved that the influence mechanisms of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V specimens with CBN electroplated wheels are different due to the material properties.

KW - Fatigue

KW - Grinding

KW - Inconel 718

KW - Surface integrity

KW - Ti6Al4V

UR - https://www.scopus.com/pages/publications/85060958445

U2 - 10.1007/s00170-019-03345-6

DO - 10.1007/s00170-019-03345-6

M3 - 文章

AN - SCOPUS:85060958445

SN - 0268-3768

VL - 102

SP - 2345

EP - 2356

JO - International Journal of Advanced Manufacturing Technology

JF - International Journal of Advanced Manufacturing Technology

IS - 5-8

ER -

Influence of surface integrity on fatigue behavior of Inconel 718 and Ti6Al4V workpieces with CBN electroplated wheel

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