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M.C. Oh, H. Yeom, Y. Jeon and B. Ahn

Abstract

The influence of surface heat treatment using laser radiation on the fatigue strength and corresponding microstructural evolution of AISI 4140 alloy steel was investigated in this research. The AISI 4140 alloy steel was radiated by a diode laser to give surface temperatures in the range between 600 and 800°C, and subsequently underwent vibration peening. The fatigue behavior of surface-treated specimens was examined using a giga-cycle ultrasonic fatigue test, and it was compared with that of non-treated and only-peened specimens. Fatigue fractured surfaces and microstructural evolution with respect to the laser treatment temperatures were investigated using an optical microscope. Hardness distribution was measured using Vickers micro-hardness. Higher laser temperature resulted in higher fatigue strength, attributed to the phase transformation.

Open access

C. Jung, M.G. Lee and Y. Jeon

REFERENCES [1] B.J. Choi, Y. Jeon, M.G. Lee, H.J. Kim, D.K. Kim, Analysis of Micro Forging System for Straightness of Vibration Tip. Korea society for precision engineering 2016 autumn conference, 863-863. (2015). [2] C.H. Jung, M.G. Lee, J.N. Park, Y. Jeon, FEM simulation and experimental validation of residual stress on surface by micro forging processes, International Conference on Surface Modification Technologies (2016). [3] W.S. Lee, G.W. Yeh, The Plastic Deformation Behavior of AISI 4340 Alloy Steel Subjected to High Temperature and High

Open access

J. Meško, R. Nigrovič and A. Zrak

analysis of welded joints after laser welding. Manufacturing technology, 14(3), 355-359. 341. J.E. Purkyne University, Ústinad Labem. ISSN 1213-2489. [7] Patek, M., Konar, R., Sladek, A. & Radek, N. (2014). Nondestructive testing of split sleeve welds by the ultrasonic TOFD method. Manufacturing technology, 14(3), 355-359. J.E. Purkyne University, Ústinad Labem. ISSN 1213-2489. [8] Lago, J., Guagliano, M., Novy, F. & Bokuvka, O. (2016). Influence of laser shock peening surface treatment on fatigue endurance of welded joints from S355

Open access

Jana Moravčíková, Daynier Rolando Delgado Sobrino and Peter Košťál

- Waterjet Machining. J. Eng. Ind. 1. 7. WANG, J., GUO, D. M. 2002. A predictive depth of penetration model for abrasive waterjet cutting of polymer matrix composites. J. of Mat. Proc. Tech. , 121 (2–3), pp. 390–394. 8. HREHA, P. et al. 2015. Determination of vibration frequency depending on abrasive mass flow rate during abrasive water jet cutting. Int. J. Adv. Manuf. Technol., 77, pp. 763–774. 9. KUMAR, R. et al. 2017. Surface integrity analysis of abrasive water jet - cut surfaces of friction stir welded joints. Int. J. Adv. Manuf. Technol