The cos&lt;i&gt;α&lt;/i&gt; method for X-ray residual stress measurement using two-dimensional detector

Tanaka, Keisuke

doi:10.1299/mer.18-00378

Cited by 98 publications

(28 citation statements)

References 30 publications

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“…The residual stress analysis were performed by X-ray diffraction analysis with Cu α-radiation at the aluminium (422) lattice plane. The measurements were performed with a diffractometer type Pulstec µ-360, based on the cos method [18,19]. The reliability of this method in combination with the 2D detector compared to the commonly used sin ψ ψ 2 method [20] was achieved by [21,22].…”

Section: Surface State Before and After Treatmentmentioning

confidence: 99%

Fatigue improvement of aluminium welds by means of deep rolling and diamond burnishing

Schubnell

Farajian²

2021

Weld World

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Deep rolling is an industrially widely established mechanical surface treatment process for the modification of roughness and fatigue resistance. However, the process has not been considered as a potential method for the mechanical post welded treatment of welded joints yet. Even, the potential of deep rolling for increasing the fatigue strength is comparably well-known in the case of non-welded components. Therefore, the effect of deep rolling (hydrostatic mounted tool) and diamond burnishing (mechanical mounted tool) to increase the fatigue strength of butt joints was approved in this work for aluminium alloy AlMg4,5Mn0,7 (EN AW 5083). For this purpose, fatigue tests under full tensile loading were performed in as-welded and deep rolled, burnished and ultrasonic impact treated conditions. Different residual stress states as well as work hardening states are determined in deep rolled and burnished condition. However, similar and significant fatigue life improvement was determined for both processes.

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Section: Surface State Before and After Treatmentmentioning

confidence: 99%

Fatigue improvement of aluminium welds by means of deep rolling and diamond burnishing

Schubnell

Farajian²

2021

Weld World

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“…Note that the error range of each measurement is about ± 25 MPa. Details of such residual stress measurement method are given in Reference [ 26 ]. Four positions on the centerline in the gauge section ( Figure 3 ) are selected for residual stress measurement in each SLM tensile specimen before tensile test.…”

Section: Methodsmentioning

confidence: 99%

Effects of Build Direction on the Mechanical Properties of a Martensitic Stainless Steel Fabricated by Selective Laser Melting

Shen

Yang

et al. 2020

Materials

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Mechanical properties and microstructure are investigated for a martensitic stainless steel (AISI 420) fabricated by selective laser melting (SLM) in three build directions. The tensile specimens built by SLM are classified into three groups. Group A is horizontally built in the thickness direction, Group B is horizontally built in the width direction, and Group C is vertically built in the length direction. The loading direction in tensile test is parallel to the build direction of Group C, but perpendicular to that of Groups A and B. Experimental results indicate build direction has significant effects on the residual stress, hardness, and tensile properties of SLM builds. Microstructural analyses indicate the as-fabricated SLM AISI 420 builds exhibit elongated cells and acicular structures which are composed of martensite and retained austenite phases growing along the build direction. Such anisotropy in the microstructure leads to anisotropic mechanical properties as Group C specimens (length direction) exhibit greater yield stress, ultimate tensile stress, and elongation than the specimens of Groups A (thickness direction) and B (width direction). The residual compressive stress in the gauge section also contributes to the superior tensile properties of Group C (length direction), as compared to Groups A (thickness direction) and B (width direction), which exhibit residual tensile stress in the gauge section.

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“…Heat treatment induces grain refinement in the microstructure which affects the crystallite sizes and alters the residual stress magnitude. The Debey-Scherrer equation was used to calculate the FWHM values shown in equation ( 5) [38].…”

Section: Residual Stress Distributionmentioning

confidence: 99%

Attainment of Favorable Microstructure for Residual Stress Reduction Through High-Temperature Heat Treatment on Additive Manufactured Inconel 718 Alloy

Jebaraj

2022

Preprint

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The mitigation of residual stress in additive manufactured metal parts through post-heat treatment helps to enhance life during service. The present work aims to investigate the effect of the high-temperature heat treatment at 1065°C on microstructural changes, residual stress patterns, and hardness of Inconel 718 metal blocks fabricated through the Laser powder bed fusion (L-PBF) process. The non-destructive X-ray diffraction technique known as cos α method was used to measure the surface residual stress by capturing the Debye ring. It was found that the existence of columnar dendrites with laves phases in the interdendritic region along the building direction was dissolved after heat treatment. The resultant microstructure showed homogeneous equiaxed grains with the formation of annealing twins along with strengthening phases (γ’ and γ’’) and tiny metal carbides on the grain boundaries. Further, the residual stress magnitude in the as-built sample was found to be 77% higher on the corners compared to the center region of the top surface. The average value of residual stress on the top surface was found to be 35.5% lesser than the lateral side surface of the sample. It was observed that the distribution of residual stress is not uniform in as-built condition. The heat-treated sample showed uniform distribution of compressive residual stresses in all the locations. This phenomenon happened due to the increase in diffusion of atoms present in the high-stress regions migrated to low-stress regions till attain their equilibrium condition. During this action, the stresses present in the grain interiors were altered considerably and resulted in complete recrystallization with the precipitation of more strengthening phases and annealing twins. The high-temperature post-heat treatment also affects the hardness leads to 23.03% increase in average microhardness mainly induced resistance to dislocation motion by precipitation of strengthening phases in the γ matrix.

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The cos<i>α</i> method for X-ray residual stress measurement using two-dimensional detector

Cited by 98 publications

References 30 publications

Fatigue improvement of aluminium welds by means of deep rolling and diamond burnishing

Fatigue improvement of aluminium welds by means of deep rolling and diamond burnishing

Effects of Build Direction on the Mechanical Properties of a Martensitic Stainless Steel Fabricated by Selective Laser Melting

Attainment of Favorable Microstructure for Residual Stress Reduction Through High-Temperature Heat Treatment on Additive Manufactured Inconel 718 Alloy

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