Residual Stress Distribution and Microstructure at a Laser Spot of AISI 304 Stainless Steel Subjected to Different Laser Shock Peening Impacts

Zhang, Wenquan; Lu, Jinzhong; Luo, Kaiyu

doi:10.3390/met6010006

Cited by 18 publications

(10 citation statements)

References 19 publications

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“…Rolling up reduction 70%generates residual tensile stress of 9.7 MPa [10], while the residual stress due to welding heat adds to the existing stress of 82.40 MPa and 65.92 MPa in the WM and HAZ areas respectively. The behavior of residual stress [11] of this material follows the behavior of the crystal lattice strain (strain energy) on average, as seen in Figure 7.…”

Section: Resultsmentioning

confidence: 77%

Residual Stress Measurements on the TIG Weld Joint of 57Fe15Cr25Ni Austenitic Steel for Structural Material Applications by Means X-Ray Diffraction Techniques

Parikin

Ismoyo

Iskandar

et al. 2017

MST

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Measurements of residual stress on the 57Fe25Cr15Ni steel plate with no-filler TIG-welding process were carried out. This work was conducted to determine the nature of weld ability in synthesized steel. The bulks were formed in a dimension of 30x20x7 mm 3 to ease data retrieval. Results show that the largest residual stress occurred in the weld metal area, amounting to 82.40 MPa with lattice stretching of 0.18%. Conversely, the values decreased to 65.92 MPa and a stretch of 0.14% in the HAZ area. This residual stress is a tensile stress that can reduce the mechanical strength of the material since it adds to the applied loads. This was confirmed by microstructure observations. The carbon content was very high in the dark lines. Weaken materials usually start from this side and could initiate the intergranular cracks that rapidly migrate among its grain boundaries. Abstrak Pengukuran Tegangan Sisa pada Sambungan Las-TIG Bahan Struktur Baja Austenitik 57Fe15Cr25NiMenggunakan Teknik Difraksi Sinar-X. Pengukuran tegangan sisa pada pelat baja 57Fe15Cr25Ni akibat proses pengelasan TIG tanpa filler telah dilakukan. Pekerjaan ini dilakukan untuk mengetahui sifat mampu las dari bahan pelat baja. Bahan 'bulk' dibentuk plat dengan dimensi 30x20x7 mm3 untuk memudahkan pengambilan data. Hasil penelitian menunjukkan bahwa tegangan sisa terbesar terjadi di daerah pusat las, sekitar 82,40 MPa dengan kisi peregangan 0,18% dan turun pada sekitar 65,92 MPa dengan regangan sebesar 0,14% di daerah HAZ. Tegangan sisa ini adalah tegangan tarik yang dapat mengurangi kekuatan mekanik material karena mampu menambah beban terpakai. Hal ini ditegaskan dengan pengamatan mikrostruktur. Kandungan karbon sangat tinggi di garis hitam. Pelemahan bahan biasanya dimulai dari sisi ini dan bisa mengawali retakan intergranular, yang dengan cepat dapat bermigrasi di antara batas butirnya.

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Section: Resultsmentioning

confidence: 77%

Residual Stress Measurements on the TIG Weld Joint of 57Fe15Cr25Ni Austenitic Steel for Structural Material Applications by Means X-Ray Diffraction Techniques

Parikin

Ismoyo

Iskandar

et al. 2017

MST

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“…Microstructural changes such as dynamic recrystallization and grain refinement help in improving mechanical performance [ 28 , 34 , 35 ]. The increased dislocation density due to grain refinement has been demonstrated to increase the hardness [ 36 , 37 , 38 , 39 ]. In austenitic stainless steel (SS304), air blast shot peening (ABSP), ultrasonic shot peening (UPS), or UNSM peening treatment induces comprehensive deformation microstructures’ grain refinement [ 40 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Peening on Microstructural Changes in GTA-Welded 304L Stainless Steel

Yoo

Kim

2022

Materials

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The introduction of tensile residual stress has led to the induction of damage such as fatigue, corrosion fatigue, and stress corrosion cracking (SCC) in stainless steel in association with the influence of environments, components, surface defects, and corrosive factors during its use. Compressive residual stress can be achieved through various techniques. Among several methods, laser peening can be more attractive as it creates regularity on the surface with a high-quality surface finish. However, there is very little research on heavily peened surface and cross-section of stainless steel with very deep compressive residual stress. This work focused on welding and laser peening and the influence of Al coating on the microstructural changes in 304L stainless steel. The specimen obtained by laser peening had a very deep compressive residual stress of over 1 mm and was evaluated based on microstructural and hardness analysis. Therefore, a model for microstructural change by laser peening on welded 304L stainless steel was proposed.

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“…The CRS induced by RT-LSP can effectively inhibit the initiation and development of cracks on the surface, which can decrease the fatigue crack growth rate [6,7]. Therefore, RT-LSP has been widely used in aeroengine blades, integral blade discs, turbine blades and other thin-walled structural parts [8], and can greatly prolong the service life of parts.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Damping Property and Its Effects on the Vibration Fatigue in Ti6Al4V Titanium Alloy Treated by Warm Laser Shock Peening

Meng

Zhao

et al. 2019

Metals

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In order to increase the vibration life of Ti6Al4V titanium alloy, warm laser shock peening (WLSP) is used to improve the damping properties and thus decrease the vibration stress in this study. Firstly, the Ti6Al4V specimens are treated by WLSP at different treatment temperatures from 200 °C to 350 °C. Then the damping ratios of untreated and WLSPed samples are obtained by impact modal tests, and the improvement of damping properties generated byWLSP is analyzed by the microstructures in Ti6Al4V titanium alloy. Moreover, the finite element simulations are utilized to study the vibration amplitude and stress during the frequency response process. Finally, the vibration fatigue tests are carried out and the fatigue fracture morphology is observed by the scanning electron microscope. The results indicate that the damping ratios of WLSPed specimens increase with the increasing treatment temperatures. This is because elevated temperatures during WLSP can effectively increase the α phase colonies and the interphase boundaries, which can significantly increase the internal friction of materials. Moreover, due to the increasing material damping ratio, the displacement and stresses during vibration were both reduced greatly by 350 °C-WLSP, which can significantly decrease the fatigue crack growth rate and thus improve the vibration fatigue life of Ti6Al4V titanium alloy.

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Residual Stress Distribution and Microstructure at a Laser Spot of AISI 304 Stainless Steel Subjected to Different Laser Shock Peening Impacts

Cited by 18 publications

References 19 publications

Residual Stress Measurements on the TIG Weld Joint of 57Fe15Cr25Ni Austenitic Steel for Structural Material Applications by Means X-Ray Diffraction Techniques

Residual Stress Measurements on the TIG Weld Joint of 57Fe15Cr25Ni Austenitic Steel for Structural Material Applications by Means X-Ray Diffraction Techniques

Effect of Laser Peening on Microstructural Changes in GTA-Welded 304L Stainless Steel

Improvement of Damping Property and Its Effects on the Vibration Fatigue in Ti6Al4V Titanium Alloy Treated by Warm Laser Shock Peening

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