A pilot study of hot deformation on laser cladding remanufactured high-strength steel
File(s)
Author(s)
Liu, Yuehan
Type
Thesis
Abstract
Laser cladding is a welding technique that has been widely used to remanufacture/repair
workpieces due to its high design freedom to rebuild areas of damage and produce relatively
low residual stress. However, the process often introduces a columnar grain structure,
heterogenetic phase distribution, and various sizes of voids in the cladding layer for high-strength steel. These problems could result in considerable variation in the microstructure and
hardness across the cladding layer, welding interface, and base metal, thereby initiating cracks from these defects under uniaxial or cyclic loading conditions. This study attempts to explore the feasibility of a new hybrid remanufacturing/repairing method that integrates the laser cladding with a subsequent hot deformation process and heat treatment to refine grain structure and eliminate large voids.
workpieces due to its high design freedom to rebuild areas of damage and produce relatively
low residual stress. However, the process often introduces a columnar grain structure,
heterogenetic phase distribution, and various sizes of voids in the cladding layer for high-strength steel. These problems could result in considerable variation in the microstructure and
hardness across the cladding layer, welding interface, and base metal, thereby initiating cracks from these defects under uniaxial or cyclic loading conditions. This study attempts to explore the feasibility of a new hybrid remanufacturing/repairing method that integrates the laser cladding with a subsequent hot deformation process and heat treatment to refine grain structure and eliminate large voids.
Version
Open Access
Date Issued
2022-07
Date Awarded
2022-10
Copyright Statement
Creative Commons Attribution NonCommercial Licence
License URL
Advisor
Jiang, Jun
Zheng, Jinghua
Lin, Jianguo
Publisher Department
Mechanical Engineering
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)