Influence of remelting and annealing on residual stress of 316L stainless steel laser clad layer

doi:10.13251/j.issn.0254-6051.2020.08.022

Abstract

Abstract: Laser cladding was carried out on Q235 steel substrate using 316L stainless steel powder, and then the clad specimens were treated by means of laser remelting and annealing. The residual stress of the clad layer and the substrate was measured through blind hole drilling. The microstructure observation and the hardness testing of the specimens were carried out respectively by optical microscope and Vickers hardness tester. The results show that the microstructure of the clad layer does not exhibit obvious changes after laser remelting. Annealed at temperature of 600 ℃ for 2 h, the grains of the clad layer grow slightly, while at 800 ℃ for 2 h recrystallization occurs and the number of dendrites decreases. The microhardness of the clad layer remains at a high level after the laser remelting and annealing. The laser remelting can reduce the clad layer residual stress by 55.9% at most, while the appropriate annealing process can reduce the residual stress by more than 70%. The annealing at 800 ℃ for 2 h can give the most significant improvement of residual stress reduction, by 83.8%.

Key words: stainless steel, laser cladding, residual stress, laser remelting, annealing

CLC Number:

TG156.99

Deng Dewei, Ma Yunbo, Ma Yushan, He Tao, Huang Zhiye, Sun Qi. Influence of remelting and annealing on residual stress of 316L stainless steel laser clad layer[J]. Heat Treatment of Metals, 2020, 45(8): 113-118.

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