scholarly journals Residual Stress of a TC17 Titanium Alloy after Belt Grinding and Its Impact on the Fatigue Life

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2218 ◽  
Author(s):  
Yi He ◽  
Guijian Xiao ◽  
Wei Li ◽  
Yun Huang
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Fatigue Life ◽  
Compressive Stress ◽  
Contact Force ◽  
Residual Compressive Stress ◽  
Feed Speed ◽  
Belt Grinding ◽  
Surface Residual Stress ◽  
Abrasive Belt

Titanium alloy materials are widely used in the design of key parts, such as aeroengine blades and integral blades. The surface residual stress has a great influence on the fatigue life of the parts mentioned above. Presently, abrasive belt grinding can form residual stress on the surface. However, the formation mechanism has not yet been revealed, providing the impetus for the present study. First of all, the surface residual stress is characterized based on Bragg’s law. The influence of contact force, reciprocating frequency, and feed speed on the residual stress of a titanium alloy abrasive belt grinding is obtained using an experimental method. The residual stress model is simulated by the tensile force on the surface of the model, and the fatigue life of the bar under a sinusoidal tensile load is analyzed by simulating the fatigue test of the titanium alloy bar. Finally, fatigue testing and fracture analysis are carried out. The experimental results show that with the increase of the grinding contact force, increase of the reciprocating frequency, and decrease of the feed speed, the residual compressive stress on the surface of the parts increases and the fatigue life is higher at the same working stress level. It also shows that the residual compressive stress produced by abrasive belt grinding is in the range of 120–300 MPa. The fatigue simulation curve’s inflection point appears at the level of 550 MPa. The error between the simulation data and the experimental data is less than 10%, which shows the accuracy of the simulation experiment. The fracture morphology at room temperature is a ductile fracture with fine equiaxed dimples.

Experimental Investigation on the Surface Integrity of Titanium Alloy TC4 in Abrasive Belt Grinding

2013 ◽  
Vol 716 ◽  
pp. 185-190
Author(s):  
He Ping Wei ◽  
Yun Huang ◽  
Zhao Yang Liu
Keyword(s):  
Residual Stress ◽  
Experimental Investigation ◽  
Titanium Alloy ◽  
Surface Integrity ◽  
Cutting Speed ◽  
Velocity Range ◽  
Belt Grinding ◽  
Surface Residual Stress ◽  
Abrasive Belt ◽  
Surface Burn

This paper aimed at that titanium alloy grinding is easy to appear surface burn, crack, then carry out the titanium alloy TC4 abrasive belt grinding experiment, focus on the effect of grinding parameters on the titanium alloy TC4 surface integrity (surface roughness, microstructure and surface residual stress) . The results of the study show that the use of zircon corundum belt and cutting speed velocity range from 18 to 26 meter per second, the surface integrity of titanium alloy TC4 is better.

Study on Pre-Stress Cutting of Bearing Race and Its Machined Surface State

2006 ◽  
Vol 532-533 ◽  
pp. 528-531 ◽  
Author(s):  
Bang Yan Ye ◽  
Bo Wu ◽  
Jian Ping Liu ◽  
Xiao Chu Liu ◽  
Xue Zhi Zhao
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Compressive Stress ◽  
Contact Fatigue ◽  
Residual Compressive Stress ◽  
Residual Tensile Stress ◽  
Machined Surface ◽  
Residual Stress State ◽  
Bearing Race ◽  
Hard Cutting

Theoretical analysis and experiments on bearing race show that a suitable residual compressive stress on roll path of bearing race can prolong its contact fatigue life. However, residual tensile stress is often found on workpiece surface of bearing race. To actively control the residual stress state and improve fatigue life of bearing part, a new method of pre-stress hard cutting is applied. In this paper, the principle of pre-stress hard cutting for bearing race is introduced as well as the experiments on it. In the experiments, residual stress, hardness and roughness of machined surface are measured and analyzed. Moreover, micro-topography and texture characteristics of machined surface are investigated and experimental results are compared with that by grinding. It is found that we can get residual compressive stress and fine quality on machined surface of bearing race by pre-stress hard cutting and increase its productivity as well.

scholarly journals Research on Mechanical Properties of 210Cr12 Shaft Surface Processed with Rolling

Coatings ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 611
Author(s):  
Yang Qiao ◽  
Hongtang Chen ◽  
Kaihua Qi ◽  
Peiquan Guo
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Compressive Stress ◽  
Rolling Process ◽  
Residual Compressive Stress ◽  
Surface Residual Stress ◽  
Absolute Value ◽  
The Press ◽  
Stress Layer ◽  
Shaft Surface

The rolling process is one of the most effective ways for strengthening a part’s surface. As the press force exerted on specimen in rolling process, material in the surface layer will deform plastically if the press force is sufficient. That might result in grain refinement, dislocation configuration change, or phase change in specimen surface layer material. Consequently, the surface material mechanical properties can be changed. The effects of rolling parameters on surface residual stress, micro-hardness, and surface roughness for a 210Cr12 shaft have been investigated. After the rolling process, the surface residual stress of the specimen changes from tensile stress to compressive stress, and a stable residual compressive stress layer is formed. The maximum absolute value of compressive stress can be up to 216MPa. With the increase of the value of contact stress exerted on shaft surface and the number of rolling cycles, the absolute value of residual compressive stress increases firstly and then becomes stable. With the increase of depth from shaft surface to interior, the absolute value of residual compressive stress increases initially, then decreases and disappears finally. The maximum absolute value of residual compressive stress exists at the position beneath specimen surface about 0.025mm. The depth of residual stress layer is about 0.2 mm. Research results indicate that shaft surface microhardness can be improved within small range, surface roughness can be reduced up to 67%.

scholarly journals Prediction of Surface Residual Stress on Titanium Alloy generated by Belt Grinding using Molecular System Dynamics

Procedia CIRP ◽  
2020 ◽  
Vol 87 ◽  
pp. 480-484
Author(s):  
Huang Yun ◽  
Liu Shuai ◽  
Xiao Guijian ◽  
He Yi ◽  
Wang Wenxi ◽  
...  
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
System Dynamics ◽  
Molecular System ◽  
Belt Grinding ◽  
Surface Residual Stress

A multi-particle abrasive model for investigation of residual stress in belt grinding of titanium alloys

2021 ◽  
pp. 095440542110079
Author(s):  
Guijian Xiao ◽  
Kangkang Song ◽  
Huawei Zhou ◽  
Yi He ◽  
Wentao Dai
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Simulation Model ◽  
Fe Simulation ◽  
Service Performance ◽  
Belt Grinding ◽  
Surface Residual Stress ◽  
Technical Problems ◽  
Grinding Parameters ◽  
Aero Engine

The titanium alloy blade is a key part of an aero-engine, but its high surface efficiency and precision machining present technical problems. Belt grinding can effectively prolong the fatigue life of the blade and enhance the service performance of the aero-engine. However, the residual stress of the workpiece after belt grinding directly affects its service performance and life. The traditional single particle abrasive model simulation is limited in exploring the influence of grinding process parameters on surface residual stress. In this study, an ABAQUS simulation model of multi-particle belt grinding is established for titanium alloy material, a finite element (FE) simulation is conducted with different technological parameters, and the results are analysed. The critical belt grinding experiment is conducted on thin-walled titanium alloy parts, and the distribution characteristics of surface residual stress after grinding are studied to understand the influence of grinding parameters on the formation of surface residual stress. Comparing the results of the FE simulation and the grinding experiment, the common law of stress change and the prediction model are obtained. The results show that the multi-particle belt grinding simulation is consistent with the belt grinding experiment in terms of the influence of grinding parameters on residual stress. The simulation can serve as a guide in actual belt grinding to some extent. Directions for improving the multi-particle abrasive simulation model are discussed.

Experimental Research on Surface Residual Stress of Quenched GCr15 Steel in Ultrasonic Aided Turning

2013 ◽  
Vol 797 ◽  
pp. 657-662
Author(s):  
Feng Jiao ◽  
Xiang Liu ◽  
Chong Yang Zhao ◽  
Xiong Zhang
Keyword(s):  
Residual Stress ◽  
Compressive Stress ◽  
Surface Integrity ◽  
Hard Turning ◽  
Cutting Speed ◽  
Residual Compressive Stress ◽  
Depth Of Cut ◽  
Surface Residual Stress ◽  
Machined Surface ◽  
Gcr15 Steel

Surface residual stress has become one of the important indexes measuring surface integrity in hard turning of precision parts. The type of surface residual stress and the influence rules of cutting parameters on surface residual stress in hard turning of GCr15 steel are studied in this paper. Research results show that no matter in common or ultrasonic turning, tangential surface residual compressive stress can be found in machined surface. The effect of cutting speed on the residual compressive stress is the greatest, the effect of feed rate takes the second place and the effect of depth of cut is minimal. The conclusions have provided experimental basis for enhancing the surface integrity of quenched GCr15 steel precision parts.

scholarly journals Surface Integrities of Different Trajectories in Belt Grinding for Pure Iron Functional Performance Test Pieces

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 123 ◽  
Author(s):  
Ying Liu ◽  
Wentao Dai ◽  
Guijian Xiao ◽  
Yun Huang
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Functional Properties ◽  
Pure Iron ◽  
Performance Test ◽  
Functional Performance ◽  
Micro Hardness ◽  
Belt Grinding ◽  
Surface Residual Stress ◽  
Abrasive Belt

In order to reduce the influence of surface burns and other defects in the processing of pure iron parts for a functional properties test, and to improve the accuracy and usability of the test results, abrasive belt grinding is used for surface grinding. Because of the long circumference of the belt, and the long cooling time of the abrasive particles, cold grinding can be achieved, so that the incidence of surface burns, machining hardening, and other defects can be reduced. An experimental platform for belt grinding of pure iron parts for a functional properties test was built, and corresponding belt grinding experiments were carried out. The influences of grinding parameters, such as belt velocity, feed velocity, the grinding track on the microcosmic morphology, surface roughness, surface residual stress, and micro-hardness were studied. The results showed that belt grinding improved the surface integrity, the surface roughness was less than Ra 0.4 μm, the surface residual stress ranged from −253.84 MPa to −164.14 MPa, and the micro-hardness ranged from 118 HV to 170 HV. Furthermore, to get the workpiece surface to mostly suit the functional performance test, a high abrasive belt linear speed, a low grinding depth, and a feed speed should be selected, and the processing should be conducted with a circular trajectory.

The Effects of Laser Shock Peening on Fatigue Life in Ni-Based Superalloy

2010 ◽  
Vol 135 ◽  
pp. 209-214 ◽  
Author(s):  
Wei Feng He ◽  
Ying Hong Li ◽  
Qi Peng Li ◽  
Hai Lei Liu ◽  
Yu Qin Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Compressive Stress ◽  
Structure Design ◽  
High Density ◽  
Residual Compressive Stress ◽  
Laser Shock Peening ◽  
Laser Shock ◽  
Vibration Fatigue ◽  
Shock Peening

The goal of this work was to determine effects of laser shock peening (LSP) on the fatigue life of the nickel-based superalloy, as well as the mechanism including the residual stress-depth profile (both depth of compression and magnitude) and the microstructure. The vibration fatigue performance of the standard test coupons made by Ni-based superalloy K417 with and without laser shock peening is researched. The residual stress distribution and microscopic structure after LSP are tested and analyzed by X-ray diffraction, SEM and TEM. The results indicated that the compress residual stress is up to 1.0mm in the test coupons after LSP, and the maximum residual compressive stress is about 660MPa under the surface. At the same time, the high pressure shock wave caused by laser propagate into the material which formed high density dislocation in the surface of the samples, and the γ' is divided leading to increase the sub-grain. Because of the deep residual compressive stress, high density dislocation and much more sub-grains, the vibration fatigue strength is improved about 180MPa by LSP. It is very instructive in the structure design and applying LSP to Ni-based superalloy.

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