关键词: 激光熔覆, 局部腐蚀, 结构修复, 单轴拉伸试验, 腐蚀方式, 腐蚀深度, 激光熔覆扫描路径

Abstract: In order to study the mechanical property of reworked coupons of locally corroded steel plate repaired with laser cladding technology，this paper studied the effect law of forms of corrosion，treatment of corrosion interface，corrosion depth，and scanning path of laser cladding on the mechanical property of reworked coupons through uniaxial tensile test.And it obtained the force-displacement curve and mechanical property reduction factors of the locally corroded steel plate and its reworked coupons repaired by laser cladding.The results show that the modulus of elasticity，yield strength and ultimate strength of locally corroded steel plate coupons repaired by laser cladding technology are roughly equivalent to those of intact coupons，and its ultimate elongation can be recovered to more than 70% of that of intact coupons.Soft treatment of cladding layer side-substrate interface or increasing the overlap region can move fracture location from the cladding layer side-substrate interface to the substrate and further enhance the mechanical properties of the repaired coupons.Laser cladding technology can repair steel plates of different depth of corrosion and the mechanical performance of the repaired coupons is not sensitive to the scanning path.

Key words: laser cladding, local corrosion, structural rehabilitation, uniaxial tensile test, forms of corrosion, corrosion depth, scanning path of laser cladding