Effect of high energy electro-pulsing treatment on microstructure and properties of welded joints of marine structural steel

doi:10.13251/j.issn.0254-6051.2024.04.021

Abstract

Abstract: Effect of single temperature/combined electro-pulsing technique on the microstructure and properties of welded joints of low alloy steel used in marine structures was studied. The results show that both of the electro-pulsing treatments can refine the grain size and improve the cryogenic impact property significantly. The electro-pulsing treatment can reduce the barrier of new phase nucleation, improve the nucleation rate of austenite, change the configuration of dislocations, and as a result, the effect of grain strengthening and dislocation strengthening can be achieved. Compared with the welded joints without electro-pulsing treatment, the grain size of the base metal of the single temperature electro-pulsing specimen at 500 ℃ is reduced by 93.3%, the impact absorbed energy at -40 ℃ of the welded joints of optimal combined electro-pulsing treated specimen at the temperature of first 900 ℃ and then 650 ℃ is increased by 200.12%, the impact absorbed energy at -60 ℃ is increased by 146.99%, the product of strength and elongation of the steel is increased by 36.61%.

Key words: high energy electro-pulsing, marine structural steel, welded joint, microstructure, properties

CLC Number:

TG142

Wang Yitong, Hou Huaxing, Zhang Chi, Pan Dong. Effect of high energy electro-pulsing treatment on microstructure and properties of welded joints of marine structural steel[J]. Heat Treatment of Metals, 2024, 49(4): 131-137.

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