Mechanical properties of laser cladded steel

Abstract

Laser cladding is a new technique that results in a surface layer of intermediate thickness intimately bonded to a substrate. This paper reports studies of the mechanical properties of a Co -Cr laser cladded steel substrate.Mechanical tests include hardness pro les, and tensile and low cycle fatigue. Results show that the interface between substrate and clad is very strong. Composites consisting of the clad, heat affected zone, and substrate exhibit good strain hardening and ductility. In low cycle fatigue, the number of cycles to failure for the composite is somewhat lower than for the substrate material alone for all strain amplitudes. However, the situation is reversed for stress versus number of cycles to failure. Residual stresses created during cladding survive throughout the lifetime in low cycle fatigue tests for small strain amplitudes, but vanish for higher strain amplitudes.MST/5788

Material Characterization of Hybrid Components Manufactured by Laser-Based Directed Energy Deposition on Sheet Metal Substrates

“…The reduced ductility of such coated components compared to the pure substrate material is also reported by other publications e.g. [9]. With regard to the yield strength and tensile strength of the material after coating, however, higher values have been observed when processing medium Carbon steel C45 which has a much lower yield and tensile strength in the initial state [10].…”

Towards Investigating Surface Quality of Single-Crystal Silicon Optics Polished with Different Processes

“…Besides, photothermal weak absorption imaging spectroscopy, typically based on photothermal common-path interferometry (PCI), is another technique for SSD detection since absorption is a dominant characteristic for identifying the damage precursors. It utilizes the thermal lensing effect to nondestructively obtain the weak absorption characteristics of the near-surface region of the silicon materials [21][22][23].…”

“…On the other hand, due to the lack of effective damage precursor characterization methods, there is relatively little research on the correlation between damage precursor and damage in high-energy laser systems. Therefore, it is of great significance to develop a comprehensive damage precursor detection system for different damage precursor types [21][22][23][24][25][26][27]. The main objective of this study is to investigate the surface quality of single-crystal silicon optics fabricated with different polishing processes through laser-induced SC imaging and photothermal weak absorption imaging techniques [28].…”

Dynamic behaviour of high strength steel parts developed through laser assisted direct metal deposition

“…Unlike powder metallurgy, there are no compacting forces involved and there are process associated heat transfers which can result in generation of residual stresses and non-uniformities like micro-porosity and non-homogenous microstructures, irrespective of the materials cladded. Thus the most essential need for any laser generated part is to ensure the character of structures generated and the consistency of mechanical properties vital for employment in engineering applications like those mentioned above [5,6].…”