Effect of scanning speed on mechanical properties and microstructure of ER630 wire repair layer by direct laser deposition

doi:10.13251/j.issn.0254-6051.2022.08.045

Abstract

Abstract: Effect of scanning speed on mechanical properties and microstructure of ER630 repair layer was studied by direct laser deposition (DLD) on 45 steel substrate. The results show that with the increase of scanning speed, the slag inclusion in the ER630 repair layer gradually increases and the size gradually increases. The effect of scanning speed on the density of ER630 repair layer is negligible. At the scanning speed of 30 mm/s, the microstructure is mainly lath columnar martensite and a small amount of cellular austenite. With the increase of scanning speed, the lath columnar martensite decreases and the cellular austenite gradually increases. The mechanical properties of the laser deposition wire specimen at the scanning speed of 30 mm/s are equivalent to those of the 630 stainless steel aged at 550 ℃. With the increase of scanning speed, the yield strength and hardness show a downward trend. The maximum yield strength is 961.07 MPa at 30 mm/s, and the maximum hardness is 428.88 HV at 40 mm/s. The tensile fracture morphology is dimple fracture or quasi-cleavage fracture, indicating that the DLD process can achieve excellent metallurgical bonding. Compared with the strength change at scanning speed of 30 mm/s, when the deposition efficiency is increased to 2 times, good repair strength can still be obtained.

Key words: direct laser deposition, ER630 wire, repair layer, mechanical properties, microstructure, deposition efficiency

CLC Number:

TG113.25⁺1

Yang Laixia, Li Jiale, Xu Chao, Yang Wenxuan. Effect of scanning speed on mechanical properties and microstructure of ER630 wire repair layer by direct laser deposition[J]. Heat Treatment of Metals, 2022, 47(8): 271-278.

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