Characterization on Surface Properties of Ti–6Al–4V After Multiple Shot Peening Treatments

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Lechun Xie ◽  
Yan Wen ◽  
Liqiang Wang ◽  
Chuanhai Jiang ◽  
Vincent Ji
Keyword(s):  
Surface Roughness ◽  
Stress Distribution ◽  
Surface Properties ◽  
Shot Peening ◽  
Diffraction Method ◽  
Domain Size ◽  
Treatment Method ◽  
X Ray Diffraction ◽  
Obvious Effect ◽  
Surface Residual Stresses

As an important surface treatment method, shot peening (SP) can improve the surface properties effectively. In this work, after multiple SP treatments, the uniformity of the residual stress distribution and the domain size distribution on the surface of Ti–6Al–4 V have been investigated via an X-ray diffraction method. Compared with traditional SP treatments, the multiple SP can increase the surface residual stresses and make the stress distribution more uniform. In terms of the domain size, the multiple SP treatments mainly influence its uniform distribution, and there is no obvious effect to the values, which is due to the saturation status of SP process. In addition, the effects of multiple SP on the surface roughness and hardness have been studied. The results show that the multiple SP can reduce the surface roughness and increase the hardness in a certain extent comparing with the effect of traditional SP, which are ascribed to the smaller shot balls and the more homogeneous deformation during the process of multiple SP. Therefore, an appropriate multiple SP can improve the surface properties of Ti–6Al–4 V effectively.

scholarly journals Evaluation of Surface Integrity in 18CrNiMo7-6 Steel after Multiple Abrasive Waterjet Peening Process

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 844
Author(s):  
Yun Zou ◽  
Yafeng Xu ◽  
Jingkai Li ◽  
Shuhao Liu ◽  
Dong Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Surface Properties ◽  
Compressive Residual Stress ◽  
Abrasive Waterjet ◽  
X Ray Diffraction ◽  
Surface Residual Stresses ◽  
3D Surface Topography ◽  
Insight Into ◽  
Strengthening Method

Abrasive waterjet peening (AWJP) as an important surface strengthening method can effectively improve surface properties. In this study, after multiple AWJP, the distribution of compressive residual stress and roughness on the surface of 18CrNiMo7-6 steel has been evaluated by an X-ray diffraction (XRD) method and a 3D surface topography system, respectively. Compared with the single AWJP, multiple AWJP can obviously increase the surface residual stresses (−1024 MPa to −1455 MPa) and the depth of maximum compressive residual stress (100 μm to 120 μm), as well as make the stress distribution more uniform. In terms of the surface roughness, multiple AWJP influences its uniform distribution and reduces the surface roughness (Sa = 0.69 μm), compared with a single AWJP (Sa = 2.96 μm), due to the smaller shot balls and a uniform deformation during multiple AWJP. In addition, we have studied the effects of multiple AWJP on the hardness of the surface layer. The results show that multiple AWJP increases the hardness by up to 15.9%, compared to the single AWJP. These studies provide useful insight into improving the surface properties of 18CrNiMo7-6 steel by multiple AWJP.

Influence of Surface Roughness on the Quality of Data Obtained by Pseudo-Grazing Incidence X-Ray Diffraction

2006 ◽  
Vol 514-516 ◽  
pp. 1618-1622 ◽  
Author(s):  
Maria José Marques ◽  
J.C.P. Pina ◽  
A. Morão Dias
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Stress Gradient ◽  
Roughness Parameter ◽  
Diffraction Method ◽  
Grazing Incidence ◽  
Bragg Diffraction ◽  
X Ray Diffraction ◽  
Residual Surface Stress ◽  
X Ray

The conventional Bragg diffraction geometry, normally used to characterize the residual surface stress state, it is not suitable to evaluate surface treated materials and thin films. The X-ray path lengths through a surface layer or thin film are too short to produce adequate diffraction intensities in relation to the bulk or the substrate. Another limitation of the conventional technique appears when a residual stress gradient is present in the irradiated surface. The technique only enables the evaluation of the mean value of this gradient. In these cases, a recently proposed Pseudo-Grazing Incident X-ray Diffraction method would be better applicable. In this study, the Pseudo-Grazing Incidence X-ray Diffraction is applied to characterize the residual stress depth profiles of several AISI 4140 samples, which were prepared, by mechanical polishing and grinding, in order to present different surface roughness parameters, Ra. The experimental results lead to the conclusion that the surface roughness limits the application of the Pseudo-Grazing Incidence methodology to a minimum X-ray incident angle. This angle is the one that enables a mean X-ray penetration depth with the same order of magnitude of the sample surface roughness parameter, Ra.

Influence of Shot Peening on the Fatigue Strength of Custom 465 Stainless Steel for Aeronautic Application

2014 ◽  
Vol 891-892 ◽  
pp. 668-673 ◽  
Author(s):  
Rafael Gustavo Bonora ◽  
Herman Jacobus Cornelis Voorwald ◽  
Maria Odila Hilário Cioffi
Keyword(s):  
Stainless Steel ◽  
Shot Peening ◽  
Diffraction Method ◽  
Aircraft Industry ◽  
X Ray Diffraction ◽  
Residual Stress Field ◽  
High Mechanical Strength ◽  
Aisi 4340 Steel ◽  
X Ray ◽  
Coated Materials

This project was originated from the national aircraft industry requirements to reduce the use of coated materials with electroplated chromium or cadmium that produce waste, which is harmful to health or the environment. The selected material is a Custom 465 stainless steel used in the aeronautical field due to its high mechanical strength. Considering the load sustained by the wheel axis of the landing gear, the Custom 465 is tested in axial fatigue. The objective is to compare the behavior of the Custom 465 with plated AISI 4340 steel coated with cadmium. X-ray diffraction method was used to determine the residual stress field induced by shot peening.

A Study on Fatigue Crack Propagation Properties Using the X-Ray Diffraction Method

2008 ◽  
Vol 575-578 ◽  
pp. 1162-1169
Author(s):  
Md. Anowar Hossian ◽  
Man Bae Lim ◽  
Sun Chul Huh ◽  
Won Jo Park
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Diffraction Method ◽  
Stress Effect ◽  
X Ray Diffraction ◽  
X Ray

This study evaluated fatigue crack growth characteristics, Besides consider compressive residual stress effect and verified the most suitable shot peening velocity. Fatigue crack growth delay effect was compressive residual stress, but over peening did action projecting velocity that accelerate fatigue crack growth rate. X-ray diffraction technique according to crack length direction was applied to fatigue fractured surface. Fracture mechanics parameters could be estimated by the measurement of X-ray parameters, and the fractography observation was performed using a scanning electron microscope (SEM) for fatigue fracture surface. As the shot peening velocity increases, striation width increased. The changes in X-ray material parameters described above are directly related to the process of fatigue until the initiation of fatigue crack and X-ray diffraction pattern is thought that failure prediction with stress distribution is possible.

Experimental Investigations on Surface Residual Stresses in the As-Sprayed and Ground Nanostructured WC/12Co Coatings

2007 ◽  
Vol 359-360 ◽  
pp. 229-233 ◽  
Author(s):  
Zhao Hui Deng ◽  
Zhong Wei Hu ◽  
Qi Jing ◽  
Ya Dong Gong
Keyword(s):  
Residual Stresses ◽  
Diffraction Method ◽  
Surface Grinding ◽  
Experimental Investigations ◽  
Depth Of Cut ◽  
X Ray Diffraction ◽  
Precision Grinding ◽  
X Ray ◽  
Surface Residual Stresses ◽  
Grinding Machine

In this study, a number of experiments on surface grinding of nanostructured WC/12Co (n-WC/12Co) coatings were conducted on a precision surface grinding machine with a horizontal axis and rectangular worktable. The residual stresses in the as-sprayed and ground n-WC/12Co coatings were measured with the X-ray diffraction method. According to the experimental study and theoretical analysis, this paper investigates the influences of grinding parameters, such as depth of cut, feedrate of workpiece, abrasive grit size and wheel bond type on residual stresses precision grinding of n-WC/12Co coatings.

scholarly journals Numerical Assessment of Residual Stress Induced by Machining of Aluminum Alloy

2014 ◽  
Vol 996 ◽  
pp. 628-633 ◽  
Author(s):  
Naoufel Ben Moussa ◽  
Zouhayar Al-Adel ◽  
Habib Sidhom ◽  
Chedly Braham
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Diffraction Method ◽  
Numerical Approach ◽  
X Ray Diffraction ◽  
Near Surface ◽  
Finite Element Software ◽  
Surface Residual Stresses

A numerical approach has been developed to predict the near surface residual stresses induced by turning in orthogonal cutting configuration of aluminum alloy AA7075-T651. This approach is based on a Lagrangian formulation using the finite element software Abaqus–Explicit. The calculated residual stress profiles were validated by experimental measurements using X-ray diffraction method on samples turned under different cutting conditions. Using this method, the effect of the cutting speed and the feed on the machining residual stress has been established.

scholarly journals TAILORING SURFACE MORPHOLOGY AND TOPOGRAPHY OF SHOT-PEENED Ti6Al4V VIA GRIT BLASTING

2021 ◽  
Vol 55 (5) ◽  
Author(s):  
Yasemin Yıldıran Avcu ◽  
Okan Yetik ◽  
Mert Guney ◽  
Tamer Sınmazçelik ◽  
Egemen Avcu
Keyword(s):  
Surface Roughness ◽  
Quantitative Analysis ◽  
Surface Morphology ◽  
Surface Properties ◽  
Shot Peening ◽  
Wear Mechanisms ◽  
Surface Modifications ◽  
Grit Blasting ◽  
Embedded Particles ◽  
Modified Surface

The present study aims to reveal the effectiveness of grit blasting when modifying the surface properties of a Ti6Al4V alloy deteriorated due to shot peening. Ti6Al4V samples shot-peened under different parameters were grit-blasted (at impingement angles of 30° and 90°, blasting pressures of 1.5 bar and 3 bar). Grit blasting proved to be an effective way of tailoring the surface topography as the surface roughness of shot-peened samples (approx. 10 µm) declined to approx. 2 µm. The surface modifications mainly occurred via micro-ploughing and micro-cutting wear mechanisms, indicating that grit blasting at 30° was more favourable than at 90° for modifying the deteriorated surface properties after shot peening. Shot-peened samples behaved similarly to mirror-polished unpeened samples during grit blasting, showing that the modified surface and subsurface properties obtained via shot peening have an insignificant effect on grit blasting of the alloy. A quantitative analysis of the area covering the embedded particles on the surface of the alloy due to grit blasting showed that the area almost doubled when the alloy was grit blasted at 90° compared to 30°, highlighting an excessive amount of embedding, which would be critical when surface decontamination is important.

scholarly journals Refinement and application of X-ray diffraction method as the surface roughness analysis.

2002 ◽  
Vol 51 (9) ◽  
pp. 707-714
Author(s):  
Mikako NAKASHIMA ◽  
Masao KOSAKA ◽  
Hideki MONMA
Keyword(s):  
Surface Roughness ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Roughness Analysis
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