scholarly journals Study on the Compressive Stress Retention in Quenched Cam of 100Cr6 Steel Based on Coupled Thermomechanical and Metallurgical Modeling

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5912
Author(s):  
Jianbin Chen ◽  
Zhidong Zuo ◽  
Songze Zhou ◽  
Xiaofeng Wang ◽  
Yonglong Chen ◽  
...  
Keyword(s):  
Residual Stress ◽  
Compressive Stress ◽  
Flexible Manufacturing ◽  
Volume Fraction ◽  
Avrami Equation ◽  
Transformation Rate ◽  
Surface Residual Stress ◽  
Near Surface ◽  
Material Optimization ◽  
Modification Technique

The assembled camshaft has obvious advantages in material optimization and flexible manufacturing. As the most important surface modification technique, the heat treatment process is utilized in this work to promote the desired compressive residual stress on the near-surface of the 100Cr6 steel assembled cam. The Johnson-Mehl-Avrami equation and Koistinen-Marbuger law are integrated into the ABAQUS software via user subroutines to simulate the evolution of diffusional transformation and diffusionless transformation, respectively. The linear mixture law is used for describing the coupled thermomechanical and metallurgical behaviors in the quenching of steel cam. The influences of various quenchants and the probable maximum phase volume fractions on surface residual stress or hardness are analyzed. Results show that a greater amount of martensite volume fraction and a slower martensitic transformation rate are beneficial for the compressive stress retention. Compared with the conventional quenching oil, the fast oil quenched cam surface has higher final compressive stress and hardness.

The Application of Fine Increment Hole Drilling for Measuring Machining-Induced Residual Stresses

2006 ◽  
Vol 3-4 ◽  
pp. 105-110 ◽  
Author(s):  
Paul Grant ◽  
Jerry Lord ◽  
P. Whitehead ◽  
A. Tony Fry
Keyword(s):  
Residual Stress ◽  
Cost Effective ◽  
Hole Drilling ◽  
Machining Parameters ◽  
Surface Residual Stress ◽  
Near Surface ◽  
Systematic Assessment ◽  
Treatment Processes ◽  
Incremental Hole Drilling ◽  
Significant Interest

Hole drilling is one of the most widely used techniques for measuring residual stress, but the conventional approach is limited in the near surface detail that can be resolved. Because of concerns about the levels of induced residual stress that might develop during machining and surface treatment processes, there is significant interest in developing a technique that can obtain near-surface residual stress information by the application of fine-increment hole drilling. Critical information can be lost if conventional, large depth increments are used and the fine incremental hole drilling approach, using depth increments as small as 20µm, offers a cost effective and rapid solution, with the possibility of measuring near surface stresses. Results focus on three different machining studies and a shot peened specimen, all cases where the stress field changes rapidly through the depth, particularly close to the surface. A systematic assessment of machining parameters is not within the scope of this paper and is not presented, but work has focused on highlighting the application and potential of the fine increment hole drilling approach.

Residual Stress Gradients in PVD-Coated Carbide Cutting Tools

2006 ◽  
Vol 524-525 ◽  
pp. 607-612 ◽  
Author(s):  
Berend Denkena ◽  
Bernd Breidenstein
Keyword(s):  
Residual Stress ◽  
Stress State ◽  
Cutting Tools ◽  
Surface Residual Stress ◽  
Vector Method ◽  
Near Surface ◽  
Residual Stress State ◽  
Coated Tools ◽  
Cohesive Damage ◽  
Coated Carbide

PVD-coated cutting tools show a typical kind of failure in use: cohesive damage, which is believed to be a result of the residual stress state of substrate and coating. As the sin2ψ-technique does not give satisfactory information on near surface residual stress trends of coated tools the scattering vector method was applied to determine residual stress depth distributions of coating and substrate. The results are presented and an attempt for an interpretation is given.

Diffraction Peak Displacement in Residual Stress Samples Due to Partial Burial of the Sampling Volume

1997 ◽  
Vol 30 (4) ◽  
pp. 449-455 ◽  
Author(s):  
S. Spooner ◽  
X.-L. Wang
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Sample Surface ◽  
Diffraction Peak ◽  
Surface Measurement ◽  
Surface Residual Stress ◽  
Peak Displacement ◽  
Near Surface ◽  
Sampling Volume ◽  
Beam Collimation

Near-surface measurement of residual strain and stress with neutron scattering complements and extends the surface residual stress measurements by X-ray diffraction. However, neutron diffraction measurements near surfaces are sensitive to scattering volume alignment, neutron beam wavelength spread and beam collimation and, unless properly understood, can give large fictitious strains. An analytic calculation and a numerical computation of neutron diffraction peak shifts due to partial burial of the sampling volume have been made and are compared with experimental measurement. Peak shifts in a strain-free nickel sample were determined for conditions where the sample surface is displaced so that the scattering gage volume is partially buried in the sample. The analytic and numerically computed peak shifts take into account the beam collimation, neutron source size, monochromator crystal mosaic spread and the collection of diffracted intensity with a linear position-sensitive counter.

Role of Quantitative NDE Techniques in Life Management of Gas Turbine Components

2006 ◽  
Author(s):  
Michael Gorelik ◽  
Waled T. Hassan ◽  
Harry Kington
Keyword(s):  
Residual Stress ◽  
Stress Gradient ◽  
Surface Residual Stress ◽  
Major Barrier ◽  
Near Surface ◽  
Life Management ◽  
Surface Residual Stresses ◽  
Engine Components ◽  
Nondestructive Measurements ◽  
Non Destructive

A number of earlier publications discussed the benefits of probabilistic analysis and probabilistic lifing in application to critical rotating engine components. One of the important variables in both probabilistic and deterministic lifing analysis is the level of residual stress in the component. Near surface residual stresses directly influence the fatigue life of critical engine rotating components. Depending on sign and magnitude a near surface residual stress gradient can either inhibit or accelerate fatigue initiation and crack propagation. A major barrier to introducing subsurface residual stress information into the life calculation process is the necessity to make accurate and reliable nondestructive measurements on as produced hardware. The paper reviews several NDE technologies that could be candidates for both production and in-service non-destructive residual stress measurements. The importance of having accurate residual stress information and its use in the probabilistic design and life management process is illustrated on several examples. A linkage with several ongoing industry R&D programs is discussed.

Inducing Residual Stress in Bone Using Abrasive Air-Jet Surface Treatment

2007 ◽  
Author(s):  
Alpay Hizal ◽  
Balaji Sadasivam ◽  
Dwayne Arola
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Surface Treatment ◽  
Structural Changes ◽  
Surface Deformation ◽  
Radius Of Curvature ◽  
Surface Residual Stress ◽  
Near Surface ◽  
Bone Chemistry ◽  
Air Jet

Based on past research, the growth and repair of bone is a function of physical activity (i.e. stresses) and bone chemistry. As such, the rate of recovery of an individual that has undergone total joint arthroplasty could be influenced by the introduction of changes in bone chemistry and “apparent” stress state in the bone that results from the surgical procedures and/or treatments. This preliminary study explored the opportunity for introducing residual stresses in hard tissues using an air-jet surface treatment. Cortical bone was obtained from bovine femurs and treated with an abrasive jet process. The radius of curvature of the bone specimens was estimated before and after treatment and used in estimating the magnitude of surface residual stress. An SEM analysis was also performed to examine structural changes in the bone caused by the surface treatment. Results showed that it is possible to impart residual stress within bone using an air-jet surface treatment. The magnitude of surface residual stress was 16 ± 0.8 MPa. Residual stresses appeared to result from a combination of near-surface deformation and embedded particles.

Sign in / Sign up

Export Citation Format

Share Document