Influence of the cutting edge on the surface integrity in BTA deep hole drilling - part 2: Residual stress, microstructure and microhardness

Strodick, Simon; Schmidt, Rüdiger; Biermann, Dirk; Zabel, Andreas; Walther, Frank

doi:10.1016/j.procir.2022.03.047

Cited by 7 publications

(2 citation statements)

References 13 publications

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“…Tensile residual stresses exist mainly on the machined surface, while compressive residual stresses are found mainly on the machined subsurface [31,32]. The higher the cutting amount, the larger the surface tensile stress [33].…”

Section: Resultsmentioning

confidence: 99%

A Novel Method for Predicting Residual Stress in GH4169 Machined Surfaces through Micro-Hardness Measurement

Yao,

Liu,

2023

Applied Sciences

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The presence of residual stress seriously affects the mechanical performance and reliability of engineering components. Here, the authors propose a novel method to determine corresponding residual stress through micro-hardness measurements of machined surfaces. In this study, a mathematical model with equal biaxial stress indentation is established. Then, the correlation of micro-hardness with indentation and residual stress is used to determine the prediction equation of residual stress. The material applied in this study is the nickel-based Superalloy GH4169. The residual stress prediction formula for Superalloy GH4169 is ultimately determined through the finite element method by subjecting the indentation to residual stress and fitting the experimental test data. The relationship between the indentation modulus and indentation depth is given quantitatively. The relationship between residual stress and hardness is given quantitatively. The prediction results show that the compressive residual stress can enhance the material hardness and make the contact deformation only require a low indentation depth to achieve complete plastic deformation. Conversely, the tensile residual stress can result in a deeper depth and less hardness at the initial stage of the fully plastic state. For the materials that yield more easily (small ratio of elastic modulus to yield strength), the effect is more evident. The model presented in this paper can accurately forecast corresponding residual stress through measurements of the micro-hardness of machined surfaces.

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Section: Resultsmentioning

confidence: 99%

A Novel Method for Predicting Residual Stress in GH4169 Machined Surfaces through Micro-Hardness Measurement

Yao,

Liu,

2023

Applied Sciences

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“…Thil et al [28] studied the chip morphology on the macro and micro scales when drilling 18MND5 steel with BTA, and results suggested that increasing the feed rate would promote chip fragmentation and improve the material removal rate, but too high feed rate would lead to serious ank wear. Strodick et al [29] investigated the impact of the cutting edge on surface integrity resulting from BTA deep hole drilling. It was found that surface integrity always resulted from the combined and interdependent effect of the cutting edges and the guide pads.…”

Section: Introductionmentioning

confidence: 99%

Effect of drilling parameters on the hole surface integrity of low alloy steel for nuclear power during BTA deep hole drilling

Huang

Tang

et al. 2023

Int J Adv Manuf Technol

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Boring Trepanning Association (BTA) deep hole drilling is widely used in machining tube sheet of steam generator. In order to get a better service integrity, the surface quality after machining is required to be higher. In this paper, the effect mechanism of BTA deep hole drilling on the integrity and quality of the machined surface layer of low alloy steel SA508Gr.3Cl.2 for nuclear power are investigated. The results show that the gradient microstructure can be obtained by BTA drilling on the surface of inner hole, including the recrystallized layer with grain re nement and the plastic deformation layer with high density sub-crystal structure and grain distortion. With the increase of drilling speed and feed rate, the deformation layer thickness will increase. The proportion of low angle grain boundaries (LAGBs) increases with the increase of the depth from the machined surface under each drilling parameter. The increase of drilling speed leads to the increase of recrystallization degree and the proportion of LAGBs in the machined surface. The effect of feed rate on the proportion of LAGBs is opposite. The machined surface is characterized by regular peak and valley, and there are typical surface defects mainly involving feed marks, surface tearing, and ploughing grooves. With the increase of drilling speed, the surface roughness will decrease. The effect of feed rate on surface roughness is obviously lower than that of drilling speed. With the increase of drilling speed and feed rate, the depth of hardened layer increases gradually, which is caused by dislocation strengthening and ne grain strengthening effect during BTA drilling process. Higher drilling speed is recommended in forming a good machined surface with a strengthening layer of a certain thickness.

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Minimization of Milling-Induced Residual Stresses in AISI 1045 Steel: Process Optimization using Design of Experiments Taguchi Method

Durakovic,

Prakash Marimuthu

2024

J. of Materi Eng and Perform

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Influence of the cutting edge on the surface integrity in BTA deep hole drilling - part 2: Residual stress, microstructure and microhardness

Cited by 7 publications

References 13 publications

A Novel Method for Predicting Residual Stress in GH4169 Machined Surfaces through Micro-Hardness Measurement

A Novel Method for Predicting Residual Stress in GH4169 Machined Surfaces through Micro-Hardness Measurement

Effect of drilling parameters on the hole surface integrity of low alloy steel for nuclear power during BTA deep hole drilling

Minimization of Milling-Induced Residual Stresses in AISI 1045 Steel: Process Optimization using Design of Experiments Taguchi Method

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